Load Specifications
Bullet Manufacturer:Berger
Bullet Weight:168 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:.280 Ackley Improved load data
Case Length (l3):2.54"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:74 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:10.0
Load data in caliber .280 Ackley Improved with .284 | 168gr | Berger VLD Hunting bullet and 199 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Alliant Reloder-17.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 56,594 psi | 87% | 2605 fps | 100% |
| Accurate 2495 | <<locked>> | 82% | 57,174 psi | 88% | 2612 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,696 psi | 89% | 2684 fps | 99.4% |
| Accurate 2700 | <<locked>> | 84% | 58,146 psi | 89% | 2690 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,680 psi | 86% | 2730 fps | 99.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,420 psi | 87% | 2740 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,159 psi | 88% | 2661 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,711 psi | 89% | 2667 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 58,276 psi | 90% | 2776 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 58,755 psi | 90% | 2785 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 57,551 psi | 89% | 2884 fps | 98.6% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,928 psi | 89% | 2874 fps | 97.5% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 58,595 psi | 90% | 2884 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 86% | 57,058 psi | 88% | 2694 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 57,246 psi | 88% | 2700 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,129 psi | 85% | 2766 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 55,564 psi | 85% | 2776 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,478 psi | 87% | 2822 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,826 psi | 87% | 2828 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,579 psi | 56% | 2503 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,405 psi | 87% | 2812 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,942 psi | 88% | 2822 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,259 psi | 85% | 2766 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,259 psi | 85% | 2766 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,666 psi | 86% | 2772 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,841 psi | 89% | 2713 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 58,320 psi | 90% | 2723 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 58,233 psi | 90% | 2740 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 58,421 psi | 90% | 2743 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 58,697 psi | 90% | 2825 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,390 psi | 85% | 2782 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,246 psi | 87% | 2795 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,724 psi | 87% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 58,160 psi | 89% | 2812 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 98% | 58,581 psi | 90% | 2818 fps | 99.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,535 psi | 85% | 2818 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,927 psi | 86% | 2825 fps | 99.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,576 psi | 81% | 2746 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,997 psi | 82% | 2753 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,469 psi | 70% | 2680 fps | 99.7% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,035 psi | 71% | 2694 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,434 psi | 87% | 2884 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,869 psi | 87% | 2890 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,821 psi | 78% | 2743 fps | 98.2% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,213 psi | 79% | 2749 fps | 98.3% |
| Bofors RP3 | <<locked>> | 84% | 55,274 psi | 85% | 2684 fps | 100% |
| Bofors RP3 | <<locked>> | 84% | 55,753 psi | 86% | 2694 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,535 psi | 85% | 2818 fps | 99% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,927 psi | 86% | 2825 fps | 99.1% |
| Bofors RP7 | <<locked>> | 90% | 58,001 psi | 89% | 2723 fps | 99.6% |
| Bofors RP7 | <<locked>> | 90% | 58,450 psi | 90% | 2733 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,165 psi | 69% | 2621 fps | 96.3% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,701 psi | 70% | 2635 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 84% | 55,419 psi | 85% | 2700 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 55,912 psi | 86% | 2710 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,536 psi | 87% | 2776 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 56,971 psi | 88% | 2785 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 56,173 psi | 86% | 2736 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 88% | 56,594 psi | 87% | 2743 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 98% | 56,666 psi | 87% | 2766 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 98% | 57,014 psi | 88% | 2772 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,405 psi | 85% | 2746 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,782 psi | 86% | 2756 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,288 psi | 85% | 2700 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,753 psi | 86% | 2707 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,724 psi | 87% | 2730 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,246 psi | 88% | 2740 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,701 psi | 69% | 2720 fps | 97.8% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,005 psi | 69% | 2730 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 90% | 56,594 psi | 87% | 2812 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 90% | 57,363 psi | 88% | 2825 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 56% | 1663 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,593 psi | 56% | 1663 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,261 psi | 88% | 2694 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,769 psi | 89% | 2700 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,405 psi | 87% | 2674 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,869 psi | 87% | 2684 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,550 psi | 85% | 2664 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,680 psi | 86% | 2671 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 55,666 psi | 86% | 2710 fps | 99.4% |
| IMR 4350 | <<locked>> | 92% | 55,999 psi | 86% | 2717 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,144 psi | 86% | 2700 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,579 psi | 87% | 2707 fps | 99.7% |
| IMR 4831 | <<locked>> | 94% | 58,421 psi | 90% | 2762 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 55,172 psi | 85% | 2723 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,043 psi | 86% | 2713 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,231 psi | 87% | 2720 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 58,189 psi | 90% | 2753 fps | 97.8% |
| IMR 4955 Enduron | <<locked>> | 98% | 58,508 psi | 90% | 2759 fps | 97.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,853 psi | 83% | 2792 fps | 97.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,186 psi | 83% | 2802 fps | 97.8% |
| Lovex S060 | <<locked>> | 82% | 57,899 psi | 89% | 2657 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 58,059 psi | 89% | 2664 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,594 psi | 87% | 2667 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,130 psi | 88% | 2674 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,202 psi | 86% | 2694 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,623 psi | 87% | 2703 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 57,783 psi | 89% | 2740 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 58,204 psi | 90% | 2749 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,601 psi | 72% | 2595 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,978 psi | 72% | 2602 fps | 99.3% |
| Norma 201 | <<locked>> | 82% | 57,856 psi | 89% | 2674 fps | 100% |
| Norma 201 | <<locked>> | 82% | 58,349 psi | 90% | 2684 fps | 100% |
| Norma 202 | <<locked>> | 82% | 58,697 psi | 90% | 2671 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,508 psi | 88% | 2726 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,696 psi | 89% | 2730 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,275 psi | 87% | 2759 fps | 98.8% |
| Norma 204 | <<locked>> | 92% | 56,681 psi | 87% | 2769 fps | 98.9% |
| Norma MRP | <<locked>> | 98% | 55,187 psi | 85% | 2841 fps | 99.7% |
| Norma MRP | <<locked>> | 98% | 55,593 psi | 86% | 2851 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 56,637 psi | 87% | 2759 fps | 100% |
| Norma URP | <<locked>> | 92% | 57,101 psi | 88% | 2766 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 58,407 psi | 90% | 2753 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,926 psi | 85% | 2707 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,331 psi | 84% | 2812 fps | 98.1% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,636 psi | 84% | 2818 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 92% | 55,259 psi | 85% | 2762 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 92% | 55,680 psi | 86% | 2769 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,414 psi | 74% | 2690 fps | 98.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,037 psi | 75% | 2703 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,188 psi | 57% | 1699 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 57% | 1706 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,230 psi | 85% | 2687 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,680 psi | 86% | 2694 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,825 psi | 86% | 2785 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,333 psi | 87% | 2792 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,798 psi | 89% | 2795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 58,566 psi | 90% | 2808 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,347 psi | 87% | 2828 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,782 psi | 87% | 2835 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,483 psi | 68% | 2713 fps | 98.7% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,962 psi | 69% | 2726 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 84% | 58,697 psi | 90% | 2677 fps | 100% |
| Rottweil R 902 | <<locked>> | 82% | 55,535 psi | 85% | 2638 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,405 psi | 85% | 2680 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,912 psi | 86% | 2690 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,840 psi | 87% | 2740 fps | 98.1% |
| Rottweil R 904 | <<locked>> | 96% | 57,203 psi | 88% | 2746 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 98% | 57,319 psi | 88% | 2795 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 98% | 58,059 psi | 89% | 2808 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 90% | 58,001 psi | 89% | 2723 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 90% | 58,450 psi | 90% | 2733 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,202 psi | 86% | 2694 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,623 psi | 87% | 2703 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 56,594 psi | 87% | 2667 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,130 psi | 88% | 2674 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,783 psi | 89% | 2740 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 92% | 58,204 psi | 90% | 2749 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,942 psi | 88% | 2740 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,392 psi | 88% | 2746 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,841 psi | 89% | 2710 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 58,015 psi | 89% | 2713 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 58,711 psi | 90% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,159 psi | 86% | 2566 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,362 psi | 87% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,927 psi | 86% | 2654 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,362 psi | 87% | 2661 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,826 psi | 87% | 2792 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,551 psi | 89% | 2802 fps | 99.2% |
| Somchem S335 | <<locked>> | 82% | 58,204 psi | 90% | 2602 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 58,668 psi | 90% | 2608 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 58,813 psi | 90% | 2723 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 55,637 psi | 86% | 2680 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 58,755 psi | 90% | 2736 fps | 97.7% |
| Somchem S361 | <<locked>> | 94% | 55,463 psi | 85% | 2694 fps | 97.2% |
| Somchem S365 | <<locked>> | 94% | 55,941 psi | 86% | 2756 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 56,478 psi | 87% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 58,073 psi | 89% | 2772 fps | 99.6% |
| Somchem S385 | <<locked>> | 98% | 58,479 psi | 90% | 2779 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 55,753 psi | 86% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 56,014 psi | 86% | 2595 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,898 psi | 86% | 2608 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,057 psi | 86% | 2612 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,362 psi | 87% | 2648 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,840 psi | 87% | 2657 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,158 psi | 85% | 2703 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,550 psi | 85% | 2710 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,519 psi | 82% | 2694 fps | 99% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,172 psi | 83% | 2707 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 84% | 57,348 psi | 88% | 2648 fps | 100% |
| Vihtavuori N540 | <<locked>> | 84% | 57,769 psi | 89% | 2657 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,653 psi | 89% | 2756 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 58,044 psi | 89% | 2762 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 58,711 psi | 90% | 2818 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,680 psi | 86% | 2779 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,434 psi | 85% | 2835 fps | 97.6% |
| Vihtavuori N560 | <<locked>> | 98% | 55,767 psi | 86% | 2841 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,137 psi | 73% | 2684 fps | 96.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,805 psi | 74% | 2697 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 58,494 psi | 90% | 2720 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,897 psi | 84% | 2677 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,536 psi | 87% | 2776 fps | 99.8% |
| Winchester 760 | <<locked>> | 90% | 56,971 psi | 88% | 2785 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,819 psi | 74% | 2812 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,254 psi | 74% | 2818 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 58,001 psi | 89% | 2717 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 58,494 psi | 90% | 2723 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 58,407 psi | 90% | 2772 fps | 99.1% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 58,769 psi | 90% | 2779 fps | 99.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 53,243 psi | 82% | 2562 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 53,490 psi | 82% | 2566 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,792 psi | 78% | 2582 fps | 98.7% |
| Accurate 2700 | <<locked>> | 80% | 50,952 psi | 78% | 2585 fps | 98.7% |
| Accurate 3100 | <<locked>> | 82% | 30,472 psi | 47% | 2267 fps | 95% |
| Accurate 3100 | <<locked>> | 82% | 30,647 psi | 47% | 2270 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 50,488 psi | 78% | 2569 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 50,749 psi | 78% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,653 psi | 59% | 2461 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 39,117 psi | 60% | 2470 fps | 99.2% |
| Accurate High Country | <<locked>> | 90% | 43,671 psi | 67% | 2648 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 94% | 46,992 psi | 72% | 2697 fps | 95% |
| Accurate MAGPRO | <<locked>> | 94% | 47,340 psi | 73% | 2703 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 47,297 psi | 73% | 2549 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 47,747 psi | 73% | 2559 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 39,958 psi | 61% | 2497 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 86% | 40,118 psi | 62% | 2503 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 94% | 46,151 psi | 71% | 2648 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 43,482 psi | 67% | 2598 fps | 95% |
| ADI AR 2225 | <<locked>> | 98% | 34,345 psi | 53% | 2444 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,736 psi | 81% | 2759 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,939 psi | 81% | 2766 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 39,958 psi | 61% | 2497 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 39,958 psi | 61% | 2497 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,306 psi | 62% | 2507 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,182 psi | 74% | 2575 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,370 psi | 74% | 2582 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,213 psi | 79% | 2638 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,677 psi | 80% | 2648 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,565 psi | 58% | 2470 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,739 psi | 58% | 2474 fps | 99.2% |
| Alliant Reloder-17 | 49.6 gr | 80% | 42,569 psi | 65% | 2582 fps | 100% |
| Alliant Reloder-17 | 49.6 gr | 80% | 43,004 psi | 66% | 2592 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,537 psi | 61% | 2490 fps | 95.4% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,885 psi | 61% | 2500 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 90% | 39,885 psi | 61% | 2543 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 40,248 psi | 62% | 2549 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,615 psi | 42% | 2244 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,789 psi | 43% | 2251 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,183 psi | 48% | 2356 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 88% | 31,473 psi | 48% | 2365 fps | 96% |
| Alliant Reloder-26 | 50.8 gr | 80% | 29,385 psi | 45% | 2346 fps | 95.8% |
| Alliant Reloder-26 | 50.8 gr | 80% | 29,675 psi | 46% | 2356 fps | 96% |
| Bofors RP15 | <<locked>> | 92% | 39,363 psi | 61% | 2530 fps | 95.3% |
| Bofors RP15 | <<locked>> | 92% | 39,711 psi | 61% | 2536 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 48,385 psi | 74% | 2585 fps | 100% |
| Bofors RP3 | <<locked>> | 80% | 48,863 psi | 75% | 2592 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 39,885 psi | 61% | 2543 fps | 95.7% |
| Bofors RP5 | <<locked>> | 90% | 40,248 psi | 62% | 2549 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 42,641 psi | 66% | 2470 fps | 97.3% |
| Bofors RP7 | <<locked>> | 80% | 42,844 psi | 66% | 2480 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 98% | 42,206 psi | 65% | 2562 fps | 95.3% |
| Hodgdon H1000 | <<locked>> | 98% | 42,728 psi | 66% | 2575 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 48,631 psi | 75% | 2595 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 49,081 psi | 76% | 2605 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 40,451 psi | 62% | 2500 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 80% | 40,872 psi | 63% | 2513 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 80% | 43,381 psi | 67% | 2520 fps | 96.8% |
| Hodgdon H4350 | <<locked>> | 80% | 43,787 psi | 67% | 2530 fps | 97% |
| Hodgdon H4831 | <<locked>> | 92% | 46,296 psi | 71% | 2598 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 92% | 46,644 psi | 72% | 2608 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 48,385 psi | 74% | 2635 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 45,629 psi | 70% | 2589 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,157 psi | 54% | 2365 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,375 psi | 54% | 2372 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,156 psi | 82% | 2680 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,664 psi | 83% | 2690 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,247 psi | 60% | 2598 fps | 95.9% |
| Hodgdon Retumbo | <<locked>> | 96% | 39,523 psi | 61% | 2605 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 39,378 psi | 61% | 2513 fps | 96.7% |
| Hodgdon Superformance | <<locked>> | 80% | 39,726 psi | 61% | 2523 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,340 psi | 42% | 1483 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 42% | 1483 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,969 psi | 83% | 2648 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,186 psi | 83% | 2651 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,763 psi | 77% | 2579 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,241 psi | 77% | 2589 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,141 psi | 80% | 2612 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,286 psi | 80% | 2618 fps | 99.4% |
| IMR 4350 | <<locked>> | 80% | 38,232 psi | 59% | 2405 fps | 96.1% |
| IMR 4350 | <<locked>> | 80% | 38,421 psi | 59% | 2411 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,034 psi | 68% | 2500 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,208 psi | 68% | 2507 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 37,130 psi | 57% | 2415 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 37,507 psi | 58% | 2425 fps | 98.9% |
| IMR 4895 | <<locked>> | 80% | 52,547 psi | 81% | 2664 fps | 100% |
| IMR 4895 | <<locked>> | 80% | 53,040 psi | 82% | 2674 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,295 psi | 70% | 2543 fps | 95.1% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,658 psi | 70% | 2552 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 94% | 44,222 psi | 68% | 2625 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 94% | 44,541 psi | 69% | 2631 fps | 95.5% |
| Lovex S060 | <<locked>> | 80% | 54,346 psi | 84% | 2612 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 54,824 psi | 84% | 2618 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,038 psi | 77% | 2575 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,531 psi | 78% | 2585 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,510 psi | 64% | 2451 fps | 98.6% |
| Lovex S065 | <<locked>> | 80% | 41,669 psi | 64% | 2457 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 39,726 psi | 61% | 2434 fps | 97.3% |
| Lovex S070 | <<locked>> | 80% | 40,103 psi | 62% | 2444 fps | 97.5% |
| Lovex S071 | <<locked>> | 88% | 31,749 psi | 49% | 2297 fps | 95.5% |
| Lovex S071 | <<locked>> | 88% | 32,097 psi | 49% | 2306 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 54,520 psi | 84% | 2631 fps | 100% |
| Norma 201 | <<locked>> | 80% | 54,723 psi | 84% | 2635 fps | 100% |
| Norma 202 | <<locked>> | 80% | 55,347 psi | 85% | 2628 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,575 psi | 78% | 2625 fps | 100% |
| Norma 203B | <<locked>> | 80% | 51,039 psi | 79% | 2635 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,321 psi | 62% | 2484 fps | 95.4% |
| Norma 204 | <<locked>> | 82% | 40,466 psi | 62% | 2490 fps | 95.5% |
| Norma MRP | <<locked>> | 84% | 34,040 psi | 52% | 2438 fps | 95% |
| Norma MRP | <<locked>> | 84% | 34,389 psi | 53% | 2444 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 38,363 psi | 59% | 2454 fps | 99% |
| Norma URP | <<locked>> | 80% | 38,798 psi | 60% | 2464 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 51,082 psi | 79% | 2651 fps | 100% |
| Ramshot Big Game | <<locked>> | 80% | 51,256 psi | 79% | 2654 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 43,743 psi | 67% | 2625 fps | 95.5% |
| Ramshot Grand | <<locked>> | 94% | 44,353 psi | 68% | 2641 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,086 psi | 57% | 2441 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 80% | 37,478 psi | 58% | 2451 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 92% | 36,260 psi | 56% | 2451 fps | 95% |
| Ramshot Magnum | <<locked>> | 92% | 36,738 psi | 57% | 2464 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 43% | 1519 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,847 psi | 43% | 1519 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,646 psi | 75% | 2585 fps | 99.3% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,066 psi | 75% | 2595 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,194 psi | 70% | 2631 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,687 psi | 70% | 2641 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,450 psi | 59% | 2480 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,682 psi | 60% | 2487 fps | 98.9% |
| ReloadSwiss RS 70 | 50.3 gr | 80% | 37,188 psi | 57% | 2487 fps | 98.4% |
| ReloadSwiss RS 70 | 50.3 gr | 80% | 37,362 psi | 57% | 2493 fps | 98.5% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,100 psi | 56% | 2520 fps | 95.7% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 36,550 psi | 56% | 2533 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 51,895 psi | 80% | 2585 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 52,359 psi | 81% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,629 psi | 70% | 2536 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,108 psi | 71% | 2546 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,164 psi | 68% | 2530 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 88% | 44,541 psi | 69% | 2539 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 86% | 38,812 psi | 60% | 2477 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 86% | 38,972 psi | 60% | 2484 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 42,641 psi | 66% | 2470 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 80% | 42,844 psi | 66% | 2480 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,510 psi | 64% | 2451 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,669 psi | 64% | 2457 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 50,038 psi | 77% | 2575 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 50,531 psi | 78% | 2585 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,726 psi | 61% | 2434 fps | 97.3% |
| Shooters World SW4350 | <<locked>> | 80% | 40,103 psi | 62% | 2444 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,630 psi | 72% | 2585 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,065 psi | 72% | 2595 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,041 psi | 83% | 2657 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 54,520 psi | 84% | 2667 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 55,259 psi | 85% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,847 psi | 72% | 2441 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,050 psi | 72% | 2444 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,524 psi | 62% | 2398 fps | 97.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,901 psi | 63% | 2408 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,450 psi | 59% | 2470 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,609 psi | 59% | 2477 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 54,969 psi | 85% | 2559 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 55,143 psi | 85% | 2566 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 45,890 psi | 71% | 2533 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 46,093 psi | 71% | 2539 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 48,080 psi | 74% | 2572 fps | 95.5% |
| Somchem S361 | <<locked>> | 90% | 48,370 psi | 74% | 2582 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 34,954 psi | 54% | 2418 fps | 100% |
| Somchem S365 | <<locked>> | 80% | 35,186 psi | 54% | 2421 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 36,869 psi | 57% | 2408 fps | 95.6% |
| Somchem S385 | <<locked>> | 84% | 37,231 psi | 57% | 2418 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 52,417 psi | 81% | 2546 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 52,692 psi | 81% | 2552 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,373 psi | 81% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,895 psi | 81% | 2572 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,816 psi | 67% | 2467 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,266 psi | 68% | 2477 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,740 psi | 61% | 2451 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 80% | 40,161 psi | 62% | 2461 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 90% | 38,711 psi | 60% | 2441 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 88% | 36,550 psi | 56% | 2398 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 50,517 psi | 78% | 2556 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 50,981 psi | 78% | 2566 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,146 psi | 60% | 2451 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 80% | 39,537 psi | 61% | 2461 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 30,560 psi | 47% | 2313 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 80% | 30,777 psi | 47% | 2323 fps | 97.6% |
| Vihtavuori N560 | <<locked>> | 92% | 45,179 psi | 70% | 2657 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 92% | 45,513 psi | 70% | 2664 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 98% | 44,048 psi | 68% | 2628 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 98% | 44,657 psi | 69% | 2644 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,798 psi | 60% | 2421 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,175 psi | 60% | 2431 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 40,669 psi | 63% | 2507 fps | 97.4% |
| Winchester 760 | <<locked>> | 80% | 41,118 psi | 63% | 2516 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,323 psi | 37% | 2218 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,584 psi | 38% | 2231 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,404 psi | 84% | 2667 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 80% | 54,592 psi | 84% | 2674 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 38,624 psi | 59% | 2441 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 88% | 38,928 psi | 60% | 2451 fps | 95.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 199 powders for .280 Ackley Improved loaded with the .284 | 168gr | Berger VLD Hunting. Alliant Reloder-26 delivers the highest muzzle velocity at 2,890 fps; across all powders the maximum-charge window runs from 1,663 fps to 2,890 fps. Accurate 3100 gives the best case fill at 100 %, and 199 of the 199 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 168.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 3100, Accurate MAGPRO reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 70, Alliant Reloder-26, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 168gr | Berger VLD Hunting they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.