Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 160gr | Nosler AccuBond bullet and 104 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon H4831 SC, ReloadSwiss RS 70 and Alliant Reloder-26.
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>> | 84% | 58,465 psi | 90% | 2694 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,898 psi | 86% | 2720 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,548 psi | 82% | 2762 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 55,216 psi | 85% | 2703 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,927 psi | 86% | 2808 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,550 psi | 85% | 2900 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 82% | 57,580 psi | 89% | 2776 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,697 psi | 90% | 2782 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,739 psi | 87% | 2854 fps | 98.6% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,549 psi | 84% | 2851 fps | 97.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 58,392 psi | 90% | 2910 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,956 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,362 psi | 87% | 2779 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,478 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 58,015 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,927 psi | 86% | 2838 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,388 psi | 82% | 2848 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,212 psi | 77% | 2776 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,830 psi | 67% | 2707 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,856 psi | 89% | 2969 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,696 psi | 89% | 2799 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,892 psi | 75% | 2769 fps | 97.4% |
| Bofors RP3 | <<locked>> | 86% | 56,927 psi | 88% | 2772 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,388 psi | 82% | 2848 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 56,144 psi | 86% | 2759 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 86% | 57,479 psi | 88% | 2792 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 58,059 psi | 89% | 2861 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 57,812 psi | 89% | 2822 fps | 98.9% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 58,291 psi | 90% | 2848 fps | 97.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,261 psi | 88% | 2835 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 58,276 psi | 90% | 2785 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,855 psi | 87% | 2785 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,726 psi | 90% | 2825 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,801 psi | 66% | 2733 fps | 96.5% |
| Hodgdon Superformance | <<locked>> | 92% | 58,624 psi | 90% | 2904 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,550 psi | 56% | 1703 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,854 psi | 86% | 2740 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,349 psi | 90% | 2766 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,464 psi | 88% | 2756 fps | 99.5% |
| IMR 4350 | <<locked>> | 94% | 57,261 psi | 88% | 2795 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,972 psi | 89% | 2789 fps | 99.5% |
| IMR 4831 | <<locked>> | 94% | 56,202 psi | 86% | 2799 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,827 psi | 89% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,159 psi | 86% | 2782 fps | 97% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,924 psi | 80% | 2822 fps | 96.7% |
| Lovex D073.6 | <<locked>> | 82% | 58,276 psi | 90% | 2749 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,333 psi | 87% | 2703 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 58,523 psi | 90% | 2759 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,899 psi | 89% | 2782 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 55,782 psi | 86% | 2772 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,541 psi | 69% | 2618 fps | 98.6% |
| Norma 201 | <<locked>> | 82% | 56,434 psi | 87% | 2720 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,971 psi | 88% | 2713 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,651 psi | 86% | 2766 fps | 100% |
| Norma 204 | <<locked>> | 94% | 58,189 psi | 90% | 2848 fps | 98.7% |
| Norma MRPᴾ | <<locked>> | 100% | 56,681 psi | 87% | 2927 fps | 99.6% |
| Norma URP | <<locked>> | 94% | 58,218 psi | 90% | 2844 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,318 psi | 87% | 2792 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,185 psi | 80% | 2835 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 56,971 psi | 88% | 2851 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,485 psi | 72% | 2713 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,014 psi | 57% | 1739 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,261 psi | 88% | 2779 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,522 psi | 88% | 2844 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,638 psi | 89% | 2881 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,695 psi | 86% | 2835 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 58,088 psi | 89% | 2917 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,728 psi | 66% | 2726 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 84% | 56,942 psi | 88% | 2720 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,101 psi | 88% | 2769 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 58,494 psi | 90% | 2822 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 98% | 55,303 psi | 85% | 2828 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 90% | 56,144 psi | 86% | 2759 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,899 psi | 89% | 2782 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 58,276 psi | 90% | 2749 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 58,523 psi | 90% | 2759 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,782 psi | 86% | 2772 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,566 psi | 90% | 2828 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,086 psi | 86% | 2753 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,159 psi | 88% | 2651 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,928 psi | 89% | 2651 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,769 psi | 89% | 2736 fps | 99.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,682 psi | 90% | 2877 fps | 99% |
| Somchem S335 | <<locked>> | 82% | 56,913 psi | 88% | 2651 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,711 psi | 90% | 2772 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,898 psi | 88% | 2762 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,869 psi | 87% | 2766 fps | 96.9% |
| Somchem S365 | <<locked>> | 96% | 57,638 psi | 89% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,086 psi | 86% | 2805 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 82% | 57,667 psi | 89% | 2631 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,392 psi | 88% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,754 psi | 89% | 2697 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 58,494 psi | 90% | 2740 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,739 psi | 87% | 2789 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,605 psi | 79% | 2723 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 84% | 55,854 psi | 86% | 2697 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,854 psi | 86% | 2795 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,478 psi | 87% | 2854 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,014 psi | 88% | 2920 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,260 psi | 87% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 58,407 psi | 90% | 2867 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,324 psi | 70% | 2835 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,086 psi | 86% | 2756 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,304 psi | 87% | 2802 fps | 98.5% |
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% | 51,430 psi | 79% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,240 psi | 76% | 2612 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 33,446 psi | 51% | 2392 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 48,762 psi | 75% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,072 psi | 57% | 2484 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 98% | 51,866 psi | 80% | 2841 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 54,041 psi | 83% | 2726 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,137 psi | 71% | 2589 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,162 psi | 63% | 2575 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 96% | 47,688 psi | 73% | 2730 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,734 psi | 78% | 2795 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,586 psi | 72% | 2612 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,545 psi | 76% | 2677 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,245 psi | 56% | 2497 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,886 psi | 63% | 2615 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,625 psi | 63% | 2566 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,857 psi | 63% | 2618 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,571 psi | 41% | 2260 fps | 96.3% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,937 psi | 49% | 2425 fps | 95.3% |
| Alliant Reloder-26 | 51.9 gr | 82% | 30,182 psi | 46% | 2421 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,911 psi | 83% | 2743 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,306 psi | 62% | 2605 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 46,688 psi | 72% | 2621 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,857 psi | 63% | 2618 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 41,350 psi | 64% | 2503 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 47,282 psi | 73% | 2635 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 39,160 psi | 60% | 2533 fps | 96.5% |
| Hodgdon H4350 | <<locked>> | 80% | 41,930 psi | 65% | 2549 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 96% | 50,894 psi | 78% | 2733 fps | 95.7% |
| Hodgdon H4831 SC | 57.2 gr | 96% | 50,038 psi | 77% | 2720 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 54,650 psi | 84% | 2736 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,765 psi | 52% | 2392 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,329 psi | 79% | 2720 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,335 psi | 62% | 2674 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 38,072 psi | 59% | 2539 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 42% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,373 psi | 81% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,544 psi | 75% | 2621 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,647 psi | 78% | 2648 fps | 98.8% |
| IMR 4350 | <<locked>> | 80% | 36,970 psi | 57% | 2431 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,685 psi | 66% | 2530 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 35,679 psi | 55% | 2438 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 50,836 psi | 78% | 2703 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,705 psi | 76% | 2677 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 98% | 48,544 psi | 75% | 2759 fps | 95.9% |
| Lovex D073.6 | <<locked>> | 80% | 54,621 psi | 84% | 2703 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 53,142 psi | 82% | 2654 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,776 psi | 75% | 2618 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,176 psi | 62% | 2484 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 38,363 psi | 59% | 2461 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 32,314 psi | 50% | 2362 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 52,953 psi | 81% | 2674 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,693 psi | 83% | 2671 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,921 psi | 75% | 2664 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,495 psi | 64% | 2566 fps | 95.1% |
| Norma MRP | <<locked>> | 88% | 37,434 psi | 58% | 2572 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 36,927 psi | 57% | 2480 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 49,269 psi | 76% | 2687 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,165 psi | 69% | 2707 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 35,882 psi | 55% | 2470 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 96% | 40,219 psi | 62% | 2589 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 43% | 1555 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,094 psi | 72% | 2618 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,766 psi | 83% | 2792 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,453 psi | 67% | 2664 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,854 psi | 57% | 2503 fps | 98.1% |
| ReloadSwiss RS 70 | 50.2 gr | 80% | 35,795 psi | 55% | 2507 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,275 psi | 57% | 2598 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 50,357 psi | 77% | 2625 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,063 psi | 68% | 2572 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,498 psi | 70% | 2612 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 88% | 39,871 psi | 61% | 2556 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 41,350 psi | 64% | 2503 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,176 psi | 62% | 2484 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,621 psi | 84% | 2703 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,776 psi | 75% | 2618 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,363 psi | 59% | 2461 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,237 psi | 70% | 2625 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,663 psi | 81% | 2700 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,766 psi | 83% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,484 psi | 70% | 2484 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,247 psi | 60% | 2428 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,018 psi | 65% | 2602 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 53,447 psi | 82% | 2605 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,795 psi | 84% | 2717 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,367 psi | 68% | 2569 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,617 psi | 76% | 2654 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 33,446 psi | 51% | 2441 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 37,855 psi | 58% | 2484 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 54,331 psi | 84% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,821 psi | 78% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,821 psi | 78% | 2605 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,337 psi | 65% | 2503 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,290 psi | 59% | 2477 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 39,697 psi | 61% | 2513 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 49,226 psi | 76% | 2602 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,898 psi | 58% | 2484 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 29,167 psi | 45% | 2333 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 96% | 49,632 psi | 76% | 2795 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,434 psi | 58% | 2451 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,160 psi | 60% | 2533 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,034 psi | 39% | 2287 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,620 psi | 81% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,467 psi | 65% | 2572 fps | 95.6% |
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 110 powders for .280 Ackley Improved loaded with the .284 | 160gr | Nosler AccuBond. Alliant Reloder-26 delivers the highest muzzle velocity at 2,969 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,969 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 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. Hodgdon H4831 SC, ReloadSwiss RS 70, Alliant Reloder-26 rank at the top here: for .280 Ackley Improved with the .284 | 160gr | Nosler AccuBond 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.