Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 160gr | Speer TBBC bullet and 101 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>> | 82% | 55,303 psi | 85% | 2657 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,608 psi | 87% | 2733 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,230 psi | 83% | 2772 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 55,782 psi | 86% | 2713 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,710 psi | 87% | 2825 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,507 psi | 87% | 2917 fps | 96.7% |
| ADI AR 2206H | <<locked>> | 82% | 58,102 psi | 89% | 2785 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,854 psi | 86% | 2746 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,406 psi | 88% | 2867 fps | 98.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,158 psi | 85% | 2861 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,129 psi | 85% | 2864 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,782 psi | 87% | 2769 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,855 psi | 87% | 2789 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,203 psi | 88% | 2874 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,708 psi | 84% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,594 psi | 87% | 2851 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,027 psi | 83% | 2858 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,908 psi | 78% | 2789 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,367 psi | 68% | 2720 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,592 psi | 84% | 2927 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 58,131 psi | 89% | 2808 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,516 psi | 76% | 2782 fps | 97.6% |
| Bofors RP3 | <<locked>> | 86% | 57,435 psi | 88% | 2782 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,027 psi | 83% | 2858 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 56,840 psi | 87% | 2772 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 86% | 57,928 psi | 89% | 2802 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 58,755 psi | 90% | 2874 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 58,552 psi | 90% | 2835 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 98% | 55,042 psi | 85% | 2805 fps | 96.7% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,943 psi | 89% | 2844 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 82% | 58,740 psi | 90% | 2795 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,638 psi | 89% | 2799 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,593 psi | 86% | 2785 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,294 psi | 67% | 2746 fps | 96.7% |
| Hodgdon Superformance | <<locked>> | 90% | 55,172 psi | 85% | 2858 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 56% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,362 psi | 87% | 2749 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,201 psi | 85% | 2726 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,914 psi | 89% | 2762 fps | 99.6% |
| IMR 4350 | <<locked>> | 94% | 57,624 psi | 89% | 2802 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 58,363 psi | 90% | 2799 fps | 99.6% |
| IMR 4831 | <<locked>> | 94% | 56,927 psi | 88% | 2812 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 58,363 psi | 90% | 2815 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,768 psi | 87% | 2795 fps | 97.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,504 psi | 81% | 2835 fps | 96.9% |
| Lovex S060 | <<locked>> | 82% | 56,840 psi | 87% | 2713 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,405 psi | 85% | 2720 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 58,653 psi | 90% | 2795 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 56,521 psi | 87% | 2785 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,194 psi | 70% | 2631 fps | 98.8% |
| Norma 201 | <<locked>> | 82% | 56,681 psi | 87% | 2726 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,479 psi | 88% | 2723 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,144 psi | 86% | 2776 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,810 psi | 84% | 2802 fps | 98.2% |
| Norma MRPᴾ | <<locked>> | 100% | 57,377 psi | 88% | 2940 fps | 99.7% |
| Norma URP | <<locked>> | 94% | 58,668 psi | 90% | 2854 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,116 psi | 88% | 2805 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,808 psi | 81% | 2848 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 94% | 57,667 psi | 89% | 2864 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,007 psi | 72% | 2726 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 57% | 1745 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,682 psi | 89% | 2785 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 58,073 psi | 89% | 2858 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 58,131 psi | 89% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,449 psi | 87% | 2848 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 58,755 psi | 90% | 2930 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,410 psi | 67% | 2746 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 84% | 57,479 psi | 88% | 2730 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,595 psi | 89% | 2779 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,419 psi | 85% | 2782 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 98% | 56,014 psi | 86% | 2841 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 90% | 56,840 psi | 87% | 2772 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 58,653 psi | 90% | 2795 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,405 psi | 85% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,521 psi | 87% | 2785 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,695 psi | 86% | 2789 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,536 psi | 87% | 2759 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,711 psi | 89% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 58,407 psi | 90% | 2661 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 58,450 psi | 90% | 2753 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,535 psi | 85% | 2838 fps | 98.6% |
| Somchem S335 | <<locked>> | 82% | 57,101 psi | 88% | 2654 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,348 psi | 88% | 2772 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,450 psi | 88% | 2779 fps | 97% |
| Somchem S365 | <<locked>> | 96% | 58,175 psi | 89% | 2854 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,739 psi | 87% | 2818 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 82% | 58,189 psi | 90% | 2641 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 58,001 psi | 89% | 2687 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 58,262 psi | 90% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,259 psi | 85% | 2700 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,450 psi | 88% | 2802 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,228 psi | 80% | 2736 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 84% | 56,289 psi | 87% | 2703 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,521 psi | 87% | 2808 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,232 psi | 88% | 2867 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,624 psi | 89% | 2930 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,884 psi | 88% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,114 psi | 85% | 2822 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,151 psi | 71% | 2851 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,855 psi | 87% | 2769 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,927 psi | 88% | 2815 fps | 98.6% |
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% | 52,054 psi | 80% | 2612 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,647 psi | 76% | 2625 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 33,837 psi | 52% | 2402 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 49,313 psi | 76% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,565 psi | 58% | 2497 fps | 98.5% |
| Accurate MAGPRO | <<locked>> | 98% | 52,518 psi | 81% | 2851 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 54,549 psi | 84% | 2736 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,369 psi | 71% | 2595 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,510 psi | 64% | 2589 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 48,269 psi | 74% | 2743 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,256 psi | 79% | 2805 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,862 psi | 72% | 2618 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,082 psi | 77% | 2687 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,695 psi | 56% | 2507 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,379 psi | 64% | 2625 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,234 psi | 63% | 2582 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,466 psi | 64% | 2631 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,890 psi | 41% | 2270 fps | 96.5% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,401 psi | 50% | 2441 fps | 95.7% |
| Alliant Reloder-26 | 52.5 gr | 82% | 30,690 psi | 47% | 2438 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 54,331 psi | 84% | 2753 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,669 psi | 63% | 2612 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 47,224 psi | 73% | 2631 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,466 psi | 64% | 2631 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 41,539 psi | 64% | 2510 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 47,761 psi | 73% | 2648 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 39,610 psi | 61% | 2546 fps | 96.7% |
| Hodgdon H4350 | <<locked>> | 80% | 42,366 psi | 65% | 2559 fps | 96% |
| Hodgdon H4831 | <<locked>> | 94% | 48,182 psi | 74% | 2690 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,647 psi | 78% | 2733 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 55,201 psi | 85% | 2746 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,243 psi | 53% | 2405 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,837 psi | 80% | 2730 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,828 psi | 63% | 2687 fps | 95.8% |
| Hodgdon Superformance | 52.8 gr | 80% | 38,421 psi | 59% | 2552 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 42% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,866 psi | 81% | 2697 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,776 psi | 75% | 2628 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,111 psi | 79% | 2661 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 37,347 psi | 57% | 2441 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,120 psi | 66% | 2543 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 36,143 psi | 56% | 2451 fps | 98.2% |
| IMR 4895 | <<locked>> | 80% | 51,387 psi | 79% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,195 psi | 73% | 2638 fps | 95% |
| IMR 7828 SSC | <<locked>> | 96% | 45,977 psi | 71% | 2717 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 53,359 psi | 82% | 2664 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,037 psi | 75% | 2625 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,596 psi | 62% | 2493 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 38,798 psi | 60% | 2474 fps | 96.6% |
| Lovex S071 | <<locked>> | 90% | 32,909 psi | 51% | 2379 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 53,461 psi | 82% | 2684 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,940 psi | 83% | 2677 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,443 psi | 76% | 2674 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,887 psi | 64% | 2575 fps | 95.3% |
| Norma MRP | <<locked>> | 88% | 38,000 psi | 58% | 2589 fps | 96% |
| Norma URP | <<locked>> | 80% | 37,391 psi | 58% | 2490 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 80% | 49,719 psi | 76% | 2697 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,716 psi | 70% | 2723 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 36,289 psi | 56% | 2480 fps | 96.5% |
| Ramshot Magnum | <<locked>> | 94% | 38,043 psi | 59% | 2546 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,876 psi | 43% | 1562 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,514 psi | 73% | 2628 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 54,331 psi | 84% | 2805 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,947 psi | 68% | 2674 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,304 psi | 57% | 2513 fps | 98.2% |
| ReloadSwiss RS 70 | 50.7 gr | 80% | 36,172 psi | 56% | 2520 fps | 97.6% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,681 psi | 58% | 2612 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 50,879 psi | 78% | 2638 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,556 psi | 69% | 2582 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,861 psi | 71% | 2621 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 88% | 40,263 psi | 62% | 2566 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 41,539 psi | 64% | 2510 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,596 psi | 62% | 2493 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 49,037 psi | 75% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,798 psi | 60% | 2474 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,716 psi | 70% | 2635 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,127 psi | 82% | 2713 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 54,041 psi | 83% | 2612 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,730 psi | 70% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,639 psi | 61% | 2438 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,885 psi | 61% | 2559 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 53,925 psi | 83% | 2615 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,904 psi | 69% | 2582 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,169 psi | 77% | 2667 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 33,924 psi | 52% | 2454 fps | 99.8% |
| Somchem S385 | <<locked>> | 86% | 38,232 psi | 59% | 2493 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 54,621 psi | 84% | 2595 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 51,126 psi | 79% | 2598 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,300 psi | 79% | 2615 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,786 psi | 66% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,740 psi | 60% | 2490 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 40,292 psi | 62% | 2530 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 49,676 psi | 76% | 2612 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,305 psi | 59% | 2493 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 80% | 29,617 psi | 46% | 2346 fps | 96.6% |
| Vihtavuori N560 | <<locked>> | 94% | 47,065 psi | 72% | 2753 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,768 psi | 58% | 2461 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 39,610 psi | 61% | 2546 fps | 96.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,309 psi | 39% | 2300 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,084 psi | 82% | 2717 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,062 psi | 66% | 2589 fps | 95.8% |
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 107 powders for .280 Ackley Improved loaded with the .284 | 160gr | Speer TBBC. Norma MRP delivers the highest muzzle velocity at 2,940 fps; across all powders the maximum-charge window runs from 1,706 fps to 2,940 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 160.0 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 | 160gr | Speer TBBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.