Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 145gr | SUS-TAC HPT bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance 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.
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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 2015 | <<locked>> | 82% | 56,913 psi | 88% | 2769 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,492 psi | 87% | 2802 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,740 psi | 89% | 2864 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 58,436 psi | 90% | 2864 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,181 psi | 73% | 2776 fps | 98.1% |
| Accurate 4064 | <<locked>> | 88% | 56,550 psi | 87% | 2851 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,971 psi | 88% | 2953 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 56,159 psi | 86% | 2881 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,159 psi | 88% | 2884 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,665 psi | 84% | 2930 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 84% | 58,450 psi | 90% | 2877 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,405 psi | 87% | 2799 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,333 psi | 87% | 3009 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,696 psi | 89% | 2907 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 58,146 psi | 89% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,711 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,419 psi | 85% | 2986 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,606 psi | 82% | 2917 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,324 psi | 68% | 2799 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,073 psi | 60% | 2703 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,430 psi | 78% | 2982 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,159 psi | 86% | 2900 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 58,610 psi | 90% | 2923 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 58,001 psi | 89% | 2900 fps | 98.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,246 psi | 87% | 2808 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 58,291 psi | 90% | 2910 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,564 psi | 85% | 2887 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 55,550 psi | 85% | 2943 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 92% | 55,724 psi | 86% | 2904 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 84% | 56,753 psi | 87% | 2890 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 57,754 psi | 89% | 2927 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,536 psi | 87% | 2927 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,014 psi | 86% | 2982 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 55% | 1768 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,914 psi | 89% | 2894 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,290 psi | 88% | 2871 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,666 psi | 87% | 2867 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,188 psi | 86% | 2848 fps | 98.7% |
| IMR 4350 | <<locked>> | 98% | 58,639 psi | 90% | 2930 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,173 psi | 86% | 2874 fps | 98.6% |
| IMR 4831 | <<locked>> | 98% | 57,348 psi | 88% | 2940 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 55,869 psi | 86% | 2904 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 58,450 psi | 90% | 2877 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,115 psi | 86% | 2851 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 58,653 psi | 90% | 2854 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,695 psi | 87% | 2861 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,202 psi | 86% | 2874 fps | 99.5% |
| Lovex S070 | <<locked>> | 96% | 57,276 psi | 88% | 2910 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,972 psi | 60% | 2621 fps | 96.1% |
| Norma 201 | <<locked>> | 86% | 58,465 psi | 90% | 2874 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,506 psi | 85% | 2822 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,348 psi | 88% | 2917 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,956 psi | 86% | 2930 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 49,922 psi | 77% | 2936 fps | 97.8% |
| Norma URP | <<locked>> | 96% | 55,651 psi | 86% | 2936 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 58,247 psi | 90% | 2946 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 58,175 psi | 89% | 2989 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 54,940 psi | 85% | 2848 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 58,697 psi | 90% | 2923 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,463 psi | 56% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,579 psi | 86% | 2867 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,390 psi | 85% | 2946 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,042 psi | 85% | 2979 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,521 psi | 87% | 2972 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,579 psi | 86% | 3002 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 55,811 psi | 86% | 2802 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,550 psi | 85% | 2828 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 58,479 psi | 90% | 2917 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,449 psi | 87% | 2900 fps | 96.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,431 psi | 81% | 2897 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 94% | 58,001 psi | 89% | 2900 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,202 psi | 86% | 2874 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,115 psi | 86% | 2851 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,695 psi | 87% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,276 psi | 88% | 2910 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,449 psi | 87% | 2927 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,450 psi | 88% | 2887 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 58,001 psi | 89% | 2900 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,101 psi | 86% | 2759 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,492 psi | 87% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,956 psi | 86% | 2822 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,938 psi | 80% | 2890 fps | 96.8% |
| Somchem S335 | <<locked>> | 84% | 55,434 psi | 85% | 2756 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,232 psi | 88% | 2874 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 58,392 psi | 90% | 2910 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 58,059 psi | 89% | 2986 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,258 psi | 82% | 2877 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 84% | 56,492 psi | 87% | 2743 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,376 psi | 85% | 2785 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,043 psi | 86% | 2802 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,362 psi | 87% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 58,117 psi | 89% | 2930 fps | 100% |
| Vihtavuori N530 | <<locked>> | 82% | 55,187 psi | 85% | 2825 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 57,754 psi | 89% | 2848 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,087 psi | 88% | 2936 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,342 psi | 76% | 2877 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 58,102 psi | 89% | 2904 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,593 psi | 86% | 2874 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,825 psi | 86% | 2946 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,813 psi | 61% | 2828 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 58,218 psi | 90% | 2910 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 49,995 psi | 77% | 2812 fps | 96% |
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 2015 | <<locked>> | 80% | 53,534 psi | 82% | 2723 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,499 psi | 72% | 2657 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 54,012 psi | 83% | 2815 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,947 psi | 69% | 2641 fps | 95.7% |
| Accurate 3100 | <<locked>> | 92% | 35,911 psi | 55% | 2552 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 43,976 psi | 68% | 2657 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,808 psi | 50% | 2497 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 49,530 psi | 76% | 2776 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,974 psi | 65% | 2625 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 47,950 psi | 74% | 2812 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,576 psi | 79% | 2779 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,852 psi | 81% | 2753 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,629 psi | 70% | 2825 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,032 psi | 65% | 2648 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,092 psi | 69% | 2717 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,735 psi | 50% | 2507 fps | 95.9% |
| Alliant Reloder-17 | 48.2 gr | 80% | 36,535 psi | 56% | 2631 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,210 psi | 73% | 2805 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,718 psi | 44% | 2421 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,608 psi | 56% | 2641 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 88% | 32,909 psi | 51% | 2592 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,037 psi | 75% | 2785 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 42,119 psi | 65% | 2661 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,583 psi | 66% | 2631 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,040 psi | 82% | 2759 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,068 psi | 79% | 2805 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,728 psi | 66% | 2664 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 39,827 psi | 61% | 2654 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 86% | 46,253 psi | 71% | 2740 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 50,024 psi | 77% | 2785 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,182 psi | 46% | 2408 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,238 psi | 71% | 2762 fps | 100% |
| Hodgdon Superformance | 54.8 gr | 86% | 42,047 psi | 65% | 2730 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,847 psi | 41% | 1578 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,761 psi | 73% | 2736 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,140 psi | 77% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,092 psi | 68% | 2657 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,456 psi | 71% | 2680 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 42,975 psi | 66% | 2661 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,524 psi | 64% | 2612 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 31,792 psi | 49% | 2454 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 46,253 psi | 71% | 2746 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,576 psi | 79% | 2779 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,313 psi | 76% | 2753 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,805 psi | 75% | 2703 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,208 psi | 68% | 2661 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,506 psi | 56% | 2507 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 39,465 psi | 61% | 2592 fps | 95.3% |
| Lovex S071 | <<locked>> | 98% | 36,724 psi | 56% | 2572 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 48,472 psi | 75% | 2726 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,834 psi | 75% | 2723 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,483 psi | 68% | 2703 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 48,791 psi | 75% | 2812 fps | 95.6% |
| Norma MRP | <<locked>> | 94% | 40,669 psi | 63% | 2749 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 32,967 psi | 51% | 2497 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 44,396 psi | 68% | 2723 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 36,666 psi | 56% | 2592 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 51,547 psi | 79% | 2795 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,300 psi | 79% | 2812 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,282 psi | 42% | 1617 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,815 psi | 66% | 2644 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,225 psi | 74% | 2831 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,870 psi | 60% | 2697 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,489 psi | 50% | 2510 fps | 95.2% |
| ReloadSwiss RS 70 | 50.2 gr | 82% | 34,389 psi | 53% | 2569 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 52,547 psi | 81% | 2756 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,021 psi | 71% | 2674 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,653 psi | 61% | 2602 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 98% | 52,765 psi | 81% | 2844 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 96% | 46,108 psi | 71% | 2785 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 42,583 psi | 66% | 2631 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,506 psi | 56% | 2507 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,313 psi | 76% | 2753 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,208 psi | 68% | 2661 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,465 psi | 61% | 2592 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,640 psi | 63% | 2654 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,082 psi | 77% | 2772 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,979 psi | 74% | 2746 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,501 psi | 76% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,582 psi | 64% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,669 psi | 63% | 2556 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,658 psi | 70% | 2779 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 49,211 psi | 76% | 2667 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,908 psi | 77% | 2766 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,234 psi | 62% | 2605 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 29,515 psi | 45% | 2448 fps | 97.9% |
| Somchem S385 | <<locked>> | 94% | 43,729 psi | 67% | 2710 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 49,995 psi | 77% | 2654 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,064 psi | 71% | 2651 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,412 psi | 71% | 2661 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,348 psi | 59% | 2539 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 34,345 psi | 53% | 2497 fps | 96.2% |
| Vihtavuori N530 | <<locked>> | 80% | 51,866 psi | 80% | 2776 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,759 psi | 69% | 2651 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,852 psi | 52% | 2497 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 86% | 31,227 psi | 48% | 2497 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,852 psi | 52% | 2474 fps | 98.2% |
| Winchester 748 | <<locked>> | 80% | 51,982 psi | 80% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,074 psi | 62% | 2661 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,934 psi | 41% | 2438 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,761 psi | 73% | 2753 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,572 psi | 72% | 2753 fps | 95.1% |
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 118 powders for .280 Ackley Improved loaded with the .284 | 145gr | SUS-TAC HPT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,009 fps; across all powders the maximum-charge window runs from 1,768 fps to 3,009 fps. Accurate 3100 gives the best case fill at 100 %, and 118 of the 118 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 145gr | SUS-TAC HPT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.