Load Specifications
Bullet Manufacturer:Sellier & Bellot
Bullet Weight:158 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:1:10.5
Load data in caliber .280 Ackley Improved with .284 | 158gr | Sellier & Bellot XRG bullet and 106 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 Hodgdon Superformance.
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>> | 84% | 58,653 psi | 90% | 2713 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,970 psi | 86% | 2736 fps | 98.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,751 psi | 83% | 2782 fps | 99.7% |
| Accurate 4064 | <<locked>> | 86% | 58,726 psi | 90% | 2766 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,869 psi | 86% | 2828 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,608 psi | 86% | 2917 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 82% | 57,435 psi | 88% | 2795 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,784 psi | 90% | 2802 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,652 psi | 87% | 2867 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,389 psi | 84% | 2864 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 58,421 psi | 90% | 2930 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,956 psi | 88% | 2871 fps | 98.6% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,956 psi | 88% | 2871 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,086 psi | 86% | 2776 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,173 psi | 86% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,449 psi | 87% | 2881 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,972 psi | 89% | 2907 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,130 psi | 86% | 2861 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,229 psi | 82% | 2861 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,357 psi | 77% | 2799 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,700 psi | 67% | 2720 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,972 psi | 89% | 2992 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,711 psi | 89% | 2818 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,791 psi | 75% | 2785 fps | 97.3% |
| Bofors RP3 | <<locked>> | 86% | 57,000 psi | 88% | 2792 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,229 psi | 82% | 2861 fps | 98.2% |
| Bofors RP7 | <<locked>> | 90% | 56,202 psi | 86% | 2779 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 86% | 57,232 psi | 88% | 2808 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 58,015 psi | 89% | 2881 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 90% | 57,841 psi | 89% | 2841 fps | 98.9% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 58,436 psi | 90% | 2867 fps | 97.1% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,130 psi | 88% | 2848 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 82% | 58,102 psi | 89% | 2802 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,826 psi | 87% | 2805 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,813 psi | 90% | 2844 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,917 psi | 66% | 2749 fps | 96.4% |
| Hodgdon Superformance | <<locked>> | 92% | 58,465 psi | 90% | 2920 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 56% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,738 psi | 86% | 2756 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,146 psi | 89% | 2782 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,305 psi | 88% | 2769 fps | 99.5% |
| IMR 4350 | <<locked>> | 94% | 57,203 psi | 88% | 2812 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,986 psi | 89% | 2805 fps | 99.5% |
| IMR 4831 | <<locked>> | 94% | 56,188 psi | 86% | 2818 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,667 psi | 89% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,086 psi | 86% | 2799 fps | 96.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,808 psi | 80% | 2835 fps | 96.6% |
| Lovex D073.6 | <<locked>> | 82% | 58,088 psi | 89% | 2769 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,217 psi | 86% | 2720 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 58,305 psi | 90% | 2776 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,928 psi | 89% | 2802 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 55,811 psi | 86% | 2792 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,498 psi | 68% | 2635 fps | 98.6% |
| Norma 201 | <<locked>> | 82% | 56,318 psi | 87% | 2740 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,145 psi | 88% | 2736 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,463 psi | 85% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 94% | 58,117 psi | 89% | 2867 fps | 98.6% |
| Norma MRPᴾ | <<locked>> | 100% | 56,463 psi | 87% | 2943 fps | 99.6% |
| Norma URP | <<locked>> | 94% | 58,189 psi | 90% | 2864 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,376 psi | 87% | 2808 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,040 psi | 80% | 2851 fps | 97% |
| Ramshot Hunter | <<locked>> | 94% | 56,855 psi | 87% | 2867 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,311 psi | 71% | 2726 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 57% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,290 psi | 88% | 2795 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,290 psi | 88% | 2864 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,595 psi | 89% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,666 psi | 86% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,972 psi | 89% | 2936 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,757 psi | 66% | 2743 fps | 97.5% |
| Rottweil R 902 | <<locked>> | 84% | 56,811 psi | 87% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,855 psi | 87% | 2785 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 58,392 psi | 90% | 2841 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 98% | 55,216 psi | 85% | 2844 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 90% | 56,202 psi | 86% | 2779 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,928 psi | 89% | 2802 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 58,088 psi | 89% | 2769 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 58,305 psi | 90% | 2776 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,811 psi | 86% | 2792 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,595 psi | 90% | 2848 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,898 psi | 86% | 2766 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,043 psi | 88% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 58,044 psi | 89% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,754 psi | 89% | 2756 fps | 99.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,552 psi | 90% | 2894 fps | 98.9% |
| Somchem S335 | <<locked>> | 82% | 56,768 psi | 87% | 2667 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,769 psi | 90% | 2792 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,942 psi | 88% | 2782 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,710 psi | 87% | 2782 fps | 96.8% |
| Somchem S365 | <<locked>> | 96% | 57,624 psi | 89% | 2864 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,970 psi | 86% | 2822 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 82% | 57,566 psi | 89% | 2648 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,261 psi | 88% | 2697 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,566 psi | 89% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 58,218 psi | 90% | 2756 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,681 psi | 87% | 2808 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,793 psi | 80% | 2746 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 84% | 55,622 psi | 86% | 2713 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,825 psi | 86% | 2815 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,333 psi | 87% | 2871 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,768 psi | 87% | 2933 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,434 psi | 87% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 58,349 psi | 90% | 2884 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,426 psi | 70% | 2854 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,173 psi | 86% | 2776 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,101 psi | 86% | 2818 fps | 98.4% |
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% | 51,372 psi | 79% | 2621 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,081 psi | 76% | 2628 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 33,286 psi | 51% | 2402 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 48,660 psi | 75% | 2628 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,159 psi | 57% | 2503 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 98% | 51,706 psi | 80% | 2854 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 54,186 psi | 83% | 2746 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,064 psi | 71% | 2605 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 43,758 psi | 67% | 2644 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 96% | 47,659 psi | 73% | 2746 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,850 psi | 78% | 2815 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,133 psi | 63% | 2592 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,133 psi | 63% | 2592 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,499 psi | 72% | 2628 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,719 psi | 76% | 2697 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,158 psi | 56% | 2510 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,002 psi | 63% | 2635 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,683 psi | 63% | 2582 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,843 psi | 63% | 2635 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,498 psi | 41% | 2270 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,937 psi | 49% | 2438 fps | 95.2% |
| Alliant Reloder-26 | 52.4 gr | 82% | 30,226 psi | 47% | 2438 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,969 psi | 83% | 2766 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 43,004 psi | 66% | 2677 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 46,818 psi | 72% | 2641 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,843 psi | 63% | 2635 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 41,249 psi | 63% | 2516 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 80% | 47,123 psi | 72% | 2651 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 39,030 psi | 60% | 2546 fps | 96.3% |
| Hodgdon H4350 | <<locked>> | 80% | 42,032 psi | 65% | 2569 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 96% | 51,097 psi | 79% | 2756 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,966 psi | 77% | 2736 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 54,824 psi | 84% | 2756 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,736 psi | 52% | 2408 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,445 psi | 79% | 2740 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,277 psi | 62% | 2687 fps | 95.3% |
| Hodgdon Superformance | 52.7 gr | 80% | 37,869 psi | 58% | 2552 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 42% | 1529 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,257 psi | 80% | 2707 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,443 psi | 75% | 2638 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,531 psi | 78% | 2664 fps | 98.7% |
| IMR 4350 | <<locked>> | 82% | 39,320 psi | 60% | 2497 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,627 psi | 66% | 2546 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 35,781 psi | 55% | 2457 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 51,010 psi | 78% | 2723 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,676 psi | 76% | 2694 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 98% | 48,457 psi | 75% | 2776 fps | 95.7% |
| Lovex D073.6 | <<locked>> | 80% | 54,462 psi | 84% | 2720 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 53,098 psi | 82% | 2674 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,704 psi | 75% | 2635 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,103 psi | 62% | 2497 fps | 97.8% |
| Lovex S070 | <<locked>> | 80% | 38,305 psi | 59% | 2477 fps | 96.3% |
| Lovex S071 | <<locked>> | 90% | 32,372 psi | 50% | 2379 fps | 95% |
| Norma 201 | <<locked>> | 80% | 52,837 psi | 81% | 2690 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,563 psi | 82% | 2687 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,081 psi | 76% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,539 psi | 64% | 2582 fps | 95% |
| Norma MRP | <<locked>> | 88% | 37,449 psi | 58% | 2585 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 36,854 psi | 57% | 2493 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 80% | 49,327 psi | 76% | 2707 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,324 psi | 70% | 2726 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 35,737 psi | 55% | 2480 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 96% | 40,074 psi | 62% | 2602 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,181 psi | 73% | 2635 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,621 psi | 82% | 2812 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,555 psi | 67% | 2684 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,724 psi | 56% | 2516 fps | 97.9% |
| ReloadSwiss RS 70 | 50.7 gr | 80% | 35,868 psi | 55% | 2526 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,115 psi | 57% | 2608 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 50,546 psi | 78% | 2648 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,961 psi | 68% | 2585 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,281 psi | 70% | 2625 fps | 95% |
| Rottweil R 905 | <<locked>> | 90% | 42,438 psi | 65% | 2625 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 41,249 psi | 63% | 2516 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,103 psi | 62% | 2497 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,462 psi | 84% | 2720 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,704 psi | 75% | 2635 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,305 psi | 59% | 2477 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,078 psi | 69% | 2638 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,518 psi | 81% | 2717 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,708 psi | 83% | 2625 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,455 psi | 70% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,349 psi | 61% | 2444 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,032 psi | 65% | 2618 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 53,359 psi | 82% | 2621 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,897 psi | 84% | 2736 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,324 psi | 68% | 2585 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,806 psi | 77% | 2674 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 33,373 psi | 51% | 2454 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 37,869 psi | 58% | 2500 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 54,302 psi | 84% | 2608 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,749 psi | 78% | 2612 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,691 psi | 78% | 2621 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,250 psi | 65% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,406 psi | 59% | 2497 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 39,697 psi | 61% | 2530 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 49,110 psi | 76% | 2618 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,797 psi | 58% | 2497 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 29,109 psi | 45% | 2346 fps | 96.2% |
| Vihtavuori N560 | <<locked>> | 96% | 49,777 psi | 77% | 2818 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,478 psi | 58% | 2467 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,262 psi | 60% | 2552 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,932 psi | 38% | 2297 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,431 psi | 81% | 2723 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,438 psi | 65% | 2589 fps | 95.5% |
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 106 powders for .280 Ackley Improved loaded with the .284 | 158gr | Sellier & Bellot XRG. Alliant Reloder-26 delivers the highest muzzle velocity at 2,992 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,992 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 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 158.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 158gr | Sellier & Bellot XRG 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.