Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 165gr | Norma Bondstrike bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 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.
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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 2495 | <<locked>> | 82% | 55,376 psi | 85% | 2612 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,739 psi | 87% | 2687 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,186 psi | 83% | 2730 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 55,970 psi | 86% | 2667 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,681 psi | 87% | 2776 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,405 psi | 87% | 2871 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 82% | 58,305 psi | 90% | 2743 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,767 psi | 86% | 2697 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,580 psi | 89% | 2822 fps | 98.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,158 psi | 85% | 2818 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,216 psi | 85% | 2818 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,724 psi | 87% | 2720 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,826 psi | 87% | 2740 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,203 psi | 88% | 2825 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,998 psi | 85% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,782 psi | 87% | 2808 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,070 psi | 83% | 2815 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,097 psi | 79% | 2746 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,309 psi | 68% | 2677 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,447 psi | 84% | 2877 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 58,262 psi | 90% | 2762 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,472 psi | 76% | 2740 fps | 97.8% |
| Bofors RP3 | <<locked>> | 86% | 57,522 psi | 88% | 2736 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,070 psi | 83% | 2815 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 56,666 psi | 87% | 2723 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 86% | 58,044 psi | 89% | 2756 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,085 psi | 85% | 2776 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 58,479 psi | 90% | 2785 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 98% | 55,347 psi | 85% | 2766 fps | 96.9% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,914 psi | 89% | 2802 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,638 psi | 89% | 2749 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,608 psi | 86% | 2736 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,294 psi | 67% | 2707 fps | 97% |
| Hodgdon Superformance | <<locked>> | 90% | 55,129 psi | 85% | 2812 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,521 psi | 56% | 1670 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,231 psi | 87% | 2700 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,755 psi | 90% | 2726 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,885 psi | 89% | 2717 fps | 99.7% |
| IMR 4350 | <<locked>> | 94% | 57,653 psi | 89% | 2756 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 58,523 psi | 90% | 2753 fps | 99.7% |
| IMR 4831 | <<locked>> | 94% | 56,956 psi | 88% | 2766 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 58,276 psi | 90% | 2766 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,927 psi | 88% | 2753 fps | 97.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,504 psi | 81% | 2789 fps | 97.1% |
| Lovex D073.6 | <<locked>> | 82% | 58,798 psi | 90% | 2710 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,884 psi | 88% | 2667 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,564 psi | 85% | 2674 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 58,523 psi | 90% | 2746 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 56,405 psi | 87% | 2740 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,252 psi | 70% | 2592 fps | 98.9% |
| Norma 201 | <<locked>> | 82% | 56,753 psi | 87% | 2680 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,624 psi | 89% | 2677 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,115 psi | 86% | 2726 fps | 100% |
| Norma 204 | <<locked>> | 94% | 58,711 psi | 90% | 2812 fps | 98.9% |
| Norma MRPᴾ | <<locked>> | 100% | 57,508 psi | 88% | 2897 fps | 99.8% |
| Norma URP | <<locked>> | 94% | 58,668 psi | 90% | 2805 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,956 psi | 88% | 2753 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,634 psi | 81% | 2802 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 94% | 57,537 psi | 89% | 2815 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,195 psi | 73% | 2687 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,260 psi | 57% | 1713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,812 psi | 89% | 2743 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 58,059 psi | 89% | 2808 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 58,465 psi | 90% | 2844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,275 psi | 87% | 2795 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 58,726 psi | 90% | 2881 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,366 psi | 67% | 2703 fps | 98.1% |
| Rottweil R 902 | <<locked>> | 84% | 57,624 psi | 89% | 2684 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,696 psi | 89% | 2733 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,521 psi | 85% | 2736 fps | 97.7% |
| Rottweil R 905 | <<locked>> | 98% | 55,854 psi | 86% | 2792 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 90% | 56,666 psi | 87% | 2723 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 58,523 psi | 90% | 2746 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 58,798 psi | 90% | 2710 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,564 psi | 85% | 2674 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,405 psi | 87% | 2740 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,550 psi | 85% | 2740 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,521 psi | 87% | 2713 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,682 psi | 89% | 2612 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 58,624 psi | 90% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 58,363 psi | 90% | 2703 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,376 psi | 85% | 2789 fps | 98.8% |
| Somchem S335 | <<locked>> | 82% | 57,174 psi | 88% | 2608 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,392 psi | 88% | 2723 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,159 psi | 88% | 2730 fps | 97.2% |
| Somchem S365 | <<locked>> | 96% | 58,262 psi | 90% | 2808 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,652 psi | 87% | 2772 fps | 99.4% |
| Vihtavuori N133 | <<locked>> | 82% | 58,233 psi | 90% | 2592 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 58,044 psi | 89% | 2641 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 58,189 psi | 90% | 2657 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 58,740 psi | 90% | 2700 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,435 psi | 88% | 2753 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,214 psi | 80% | 2694 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 84% | 56,304 psi | 87% | 2657 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,246 psi | 87% | 2759 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,116 psi | 88% | 2818 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,754 psi | 89% | 2887 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,797 psi | 87% | 2720 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,085 psi | 85% | 2776 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,992 psi | 71% | 2805 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,913 psi | 88% | 2723 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,014 psi | 88% | 2769 fps | 98.8% |
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% | 52,098 psi | 80% | 2569 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,603 psi | 76% | 2579 fps | 98.3% |
| Accurate 3100 | <<locked>> | 84% | 31,589 psi | 49% | 2310 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 49,327 psi | 76% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,623 psi | 58% | 2457 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 96% | 48,892 psi | 75% | 2749 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 54,665 psi | 84% | 2690 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,369 psi | 71% | 2552 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,611 psi | 64% | 2549 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 94% | 45,005 psi | 69% | 2641 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,285 psi | 79% | 2759 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,905 psi | 72% | 2575 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,169 psi | 77% | 2641 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,695 psi | 56% | 2467 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,553 psi | 64% | 2585 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,321 psi | 64% | 2543 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 90% | 38,783 psi | 60% | 2536 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,934 psi | 41% | 2238 fps | 96.8% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,343 psi | 50% | 2402 fps | 96% |
| Alliant Reloder-26 | 50 gr | 80% | 28,631 psi | 44% | 2339 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 54,375 psi | 84% | 2707 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,669 psi | 63% | 2572 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 47,297 psi | 73% | 2589 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 38,783 psi | 60% | 2536 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 41,553 psi | 64% | 2467 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 80% | 47,645 psi | 73% | 2602 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 39,537 psi | 61% | 2503 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 42,482 psi | 65% | 2520 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 94% | 48,298 psi | 74% | 2651 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 47,239 psi | 73% | 2631 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,243 psi | 53% | 2365 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,054 psi | 80% | 2687 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 38,218 psi | 59% | 2585 fps | 95% |
| Hodgdon Superformance | 51.6 gr | 80% | 38,522 psi | 59% | 2513 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,340 psi | 42% | 1493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,968 psi | 81% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,791 psi | 75% | 2582 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,213 psi | 79% | 2615 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 37,217 psi | 57% | 2398 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,931 psi | 66% | 2497 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 36,172 psi | 56% | 2411 fps | 98.4% |
| IMR 4895 | <<locked>> | 80% | 51,445 psi | 79% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 47,181 psi | 73% | 2595 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 96% | 45,861 psi | 71% | 2671 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 80% | 55,042 psi | 85% | 2664 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 53,403 psi | 82% | 2615 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,037 psi | 75% | 2579 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,611 psi | 62% | 2451 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 38,856 psi | 60% | 2434 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 32,895 psi | 51% | 2343 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 53,490 psi | 82% | 2638 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,969 psi | 83% | 2628 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,501 psi | 76% | 2628 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,945 psi | 65% | 2536 fps | 95.6% |
| Norma MRP | <<locked>> | 86% | 35,520 psi | 55% | 2490 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 37,449 psi | 58% | 2454 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 49,748 psi | 77% | 2651 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,658 psi | 70% | 2680 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 36,187 psi | 56% | 2438 fps | 96.7% |
| Ramshot Magnum | <<locked>> | 94% | 38,000 psi | 58% | 2507 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 43% | 1529 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,703 psi | 73% | 2585 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 54,273 psi | 83% | 2753 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,150 psi | 68% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,289 psi | 57% | 2474 fps | 98.4% |
| ReloadSwiss RS 70 | 49.5 gr | 80% | 36,158 psi | 56% | 2480 fps | 97.8% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,521 psi | 58% | 2569 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 50,879 psi | 78% | 2592 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,614 psi | 69% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 46,006 psi | 71% | 2582 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 88% | 40,335 psi | 62% | 2526 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 41,553 psi | 64% | 2467 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,611 psi | 62% | 2451 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 55,042 psi | 85% | 2664 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 49,037 psi | 75% | 2579 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,856 psi | 60% | 2434 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,600 psi | 70% | 2589 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,040 psi | 82% | 2664 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 54,244 psi | 83% | 2569 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,919 psi | 71% | 2448 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,711 psi | 61% | 2402 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,958 psi | 61% | 2520 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 53,998 psi | 83% | 2569 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,918 psi | 69% | 2539 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,343 psi | 77% | 2628 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 33,779 psi | 52% | 2408 fps | 99.8% |
| Somchem S385 | <<locked>> | 84% | 35,984 psi | 55% | 2405 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 54,824 psi | 84% | 2552 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 51,343 psi | 79% | 2556 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,372 psi | 79% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,844 psi | 66% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,783 psi | 60% | 2451 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 37,666 psi | 58% | 2434 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 49,559 psi | 76% | 2566 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,247 psi | 59% | 2451 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 29,646 psi | 46% | 2310 fps | 96.9% |
| Vihtavuori N560 | <<locked>> | 94% | 47,007 psi | 72% | 2710 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,797 psi | 58% | 2421 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 39,740 psi | 61% | 2507 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,714 psi | 36% | 2208 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,084 psi | 82% | 2671 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 40,205 psi | 62% | 2493 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 109 powders for .280 Ackley Improved loaded with the .284 | 165gr | Norma Bondstrike. Norma MRP delivers the highest muzzle velocity at 2,897 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,897 fps. Accurate 3100 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. The 165.0 gr projectile in 0.284" calls for a 1:9.5 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. Alliant Reloder-26, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 165gr | Norma Bondstrike they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Bofors RP30 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.