Load Specifications
Bullet Manufacturer:Sierra
Bullet Weight:160 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:1:10.0
Load data in caliber .280 Ackley Improved with .284 | 160gr | Sierra Tipped MatchKing bullet and 105 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% | 58,291 psi | 90% | 2690 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,086 psi | 86% | 2720 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,432 psi | 82% | 2759 fps | 99.7% |
| Accurate 4064 | <<locked>> | 86% | 58,755 psi | 90% | 2749 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,767 psi | 86% | 2808 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,448 psi | 85% | 2897 fps | 96.4% |
| ADI AR 2206H | <<locked>> | 82% | 57,464 psi | 88% | 2776 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,537 psi | 90% | 2779 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,608 psi | 87% | 2851 fps | 98.6% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,447 psi | 84% | 2844 fps | 97.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 58,233 psi | 90% | 2907 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,130 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,246 psi | 87% | 2776 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,623 psi | 87% | 2864 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,870 psi | 89% | 2884 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,811 psi | 86% | 2838 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,272 psi | 82% | 2844 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,082 psi | 77% | 2776 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,729 psi | 67% | 2707 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,740 psi | 89% | 2969 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,566 psi | 89% | 2799 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,776 psi | 75% | 2769 fps | 97.3% |
| Bofors RP3 | <<locked>> | 86% | 56,797 psi | 87% | 2772 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,272 psi | 82% | 2844 fps | 98.3% |
| Bofors RP7 | <<locked>> | 90% | 56,333 psi | 87% | 2762 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 86% | 57,363 psi | 88% | 2792 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 57,914 psi | 89% | 2858 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 57,725 psi | 89% | 2818 fps | 98.9% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 58,175 psi | 89% | 2848 fps | 97.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,145 psi | 88% | 2831 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 58,102 psi | 89% | 2782 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,695 psi | 87% | 2785 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,624 psi | 90% | 2822 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,699 psi | 66% | 2730 fps | 96.4% |
| Hodgdon Superformance | <<locked>> | 92% | 58,508 psi | 90% | 2900 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,376 psi | 56% | 1699 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,695 psi | 86% | 2736 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,175 psi | 89% | 2766 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,348 psi | 88% | 2753 fps | 99.5% |
| IMR 4350 | <<locked>> | 94% | 57,130 psi | 88% | 2792 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,827 psi | 89% | 2785 fps | 99.5% |
| IMR 4831 | <<locked>> | 94% | 56,057 psi | 86% | 2799 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,682 psi | 89% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,043 psi | 86% | 2779 fps | 97% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,808 psi | 80% | 2818 fps | 96.7% |
| Lovex D073.6 | <<locked>> | 82% | 58,160 psi | 89% | 2749 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,188 psi | 86% | 2700 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 58,349 psi | 90% | 2756 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,754 psi | 89% | 2779 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 55,637 psi | 86% | 2772 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,411 psi | 68% | 2615 fps | 98.6% |
| Norma 201 | <<locked>> | 82% | 56,304 psi | 87% | 2720 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,797 psi | 87% | 2713 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,535 psi | 85% | 2762 fps | 100% |
| Norma 204 | <<locked>> | 94% | 58,059 psi | 89% | 2848 fps | 98.6% |
| Norma MRPᴾ | <<locked>> | 100% | 56,565 psi | 87% | 2927 fps | 99.6% |
| Norma URP | <<locked>> | 94% | 58,131 psi | 89% | 2844 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,231 psi | 87% | 2789 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,083 psi | 80% | 2835 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 94% | 56,840 psi | 87% | 2848 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,398 psi | 71% | 2710 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 57% | 1739 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,116 psi | 88% | 2776 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,348 psi | 88% | 2844 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,479 psi | 88% | 2877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,622 psi | 86% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,957 psi | 89% | 2913 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,656 psi | 66% | 2726 fps | 97.5% |
| Rottweil R 902 | <<locked>> | 84% | 56,826 psi | 87% | 2720 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,971 psi | 88% | 2769 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 58,363 psi | 90% | 2822 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 98% | 55,172 psi | 85% | 2825 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 90% | 56,333 psi | 87% | 2762 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,754 psi | 89% | 2779 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 58,160 psi | 89% | 2749 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 58,349 psi | 90% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,637 psi | 86% | 2772 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,755 psi | 90% | 2831 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 58,798 psi | 90% | 2785 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,956 psi | 86% | 2749 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,971 psi | 88% | 2648 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 58,117 psi | 89% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,624 psi | 89% | 2736 fps | 99.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,552 psi | 90% | 2877 fps | 99% |
| Somchem S335 | <<locked>> | 82% | 56,753 psi | 87% | 2648 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,552 psi | 90% | 2769 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,739 psi | 87% | 2762 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,768 psi | 87% | 2766 fps | 96.8% |
| Somchem S365 | <<locked>> | 96% | 57,551 psi | 89% | 2844 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,956 psi | 86% | 2802 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 82% | 57,508 psi | 88% | 2628 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,232 psi | 88% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,624 psi | 89% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 58,334 psi | 90% | 2736 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,594 psi | 87% | 2789 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,517 psi | 79% | 2723 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 84% | 55,709 psi | 86% | 2694 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,724 psi | 86% | 2792 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,333 psi | 87% | 2851 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 2917 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,144 psi | 86% | 2753 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 58,262 psi | 90% | 2864 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,223 psi | 70% | 2835 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,260 psi | 87% | 2759 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,188 psi | 86% | 2799 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% | 51,329 psi | 79% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,095 psi | 76% | 2612 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 33,344 psi | 51% | 2388 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 48,602 psi | 75% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,144 psi | 57% | 2487 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 98% | 51,750 psi | 80% | 2838 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 54,172 psi | 83% | 2730 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,006 psi | 71% | 2589 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,060 psi | 63% | 2575 fps | 95% |
| ADI AR 2213 | <<locked>> | 96% | 47,587 psi | 73% | 2726 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,633 psi | 78% | 2792 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,456 psi | 71% | 2612 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,705 psi | 76% | 2677 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,114 psi | 56% | 2493 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,017 psi | 63% | 2618 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,741 psi | 63% | 2569 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,770 psi | 63% | 2615 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,498 psi | 41% | 2257 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 90% | 32,024 psi | 49% | 2428 fps | 95.4% |
| Alliant Reloder-26 | 51.9 gr | 82% | 30,298 psi | 47% | 2425 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,751 psi | 83% | 2743 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 42,946 psi | 66% | 2657 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 46,818 psi | 72% | 2621 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,770 psi | 63% | 2615 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 41,205 psi | 63% | 2500 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 47,137 psi | 73% | 2635 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 39,044 psi | 60% | 2530 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 42,032 psi | 65% | 2549 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 96% | 51,097 psi | 79% | 2736 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 49,951 psi | 77% | 2717 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 54,810 psi | 84% | 2736 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,663 psi | 52% | 2392 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,488 psi | 79% | 2723 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,234 psi | 62% | 2671 fps | 95.4% |
| Hodgdon Superformance | 52.2 gr | 80% | 37,956 psi | 58% | 2536 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 42% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,243 psi | 80% | 2687 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,399 psi | 74% | 2618 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,531 psi | 78% | 2644 fps | 98.8% |
| IMR 4350 | <<locked>> | 80% | 36,854 psi | 57% | 2428 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,598 psi | 66% | 2530 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 35,752 psi | 55% | 2441 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 50,995 psi | 78% | 2703 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,603 psi | 76% | 2677 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 98% | 48,443 psi | 75% | 2759 fps | 95.8% |
| Lovex D073.6 | <<locked>> | 80% | 54,447 psi | 84% | 2700 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 53,026 psi | 82% | 2654 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,631 psi | 75% | 2615 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,045 psi | 62% | 2480 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 38,261 psi | 59% | 2461 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 32,401 psi | 50% | 2365 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 52,765 psi | 81% | 2671 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,577 psi | 82% | 2667 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,066 psi | 75% | 2664 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,394 psi | 64% | 2562 fps | 95.1% |
| Norma MRP | <<locked>> | 88% | 37,347 psi | 57% | 2569 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 36,825 psi | 57% | 2477 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 49,124 psi | 76% | 2684 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,063 psi | 69% | 2703 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 35,752 psi | 55% | 2464 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 96% | 40,118 psi | 62% | 2589 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 43% | 1555 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,239 psi | 73% | 2618 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,635 psi | 83% | 2792 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,598 psi | 67% | 2667 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,738 psi | 57% | 2500 fps | 98% |
| ReloadSwiss RS 70 | 50.1 gr | 80% | 35,708 psi | 55% | 2507 fps | 97.4% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,202 psi | 57% | 2595 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 50,459 psi | 78% | 2628 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,918 psi | 68% | 2569 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,397 psi | 70% | 2608 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 88% | 39,740 psi | 61% | 2552 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,205 psi | 63% | 2500 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,045 psi | 62% | 2480 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,447 psi | 84% | 2700 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,631 psi | 75% | 2615 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,261 psi | 59% | 2461 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,121 psi | 69% | 2621 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 55,129 psi | 85% | 2733 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,504 psi | 81% | 2700 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,650 psi | 83% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,339 psi | 70% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,349 psi | 61% | 2428 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,930 psi | 65% | 2598 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 53,301 psi | 82% | 2602 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,694 psi | 84% | 2717 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,266 psi | 68% | 2569 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,516 psi | 76% | 2654 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 33,344 psi | 51% | 2438 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 37,724 psi | 58% | 2480 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 54,186 psi | 83% | 2589 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,647 psi | 78% | 2589 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,647 psi | 78% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,206 psi | 65% | 2500 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,392 psi | 59% | 2480 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 39,624 psi | 61% | 2513 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 49,081 psi | 76% | 2602 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,768 psi | 58% | 2480 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 29,095 psi | 45% | 2329 fps | 96.3% |
| Vihtavuori N560 | <<locked>> | 96% | 49,530 psi | 76% | 2795 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,318 psi | 57% | 2448 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,044 psi | 60% | 2530 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,961 psi | 38% | 2283 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,518 psi | 81% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,627 psi | 66% | 2575 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 105 powders for .280 Ackley Improved loaded with the .284 | 160gr | Sierra Tipped MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,969 fps; across all powders the maximum-charge window runs from 1,699 fps to 2,969 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 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 160.0 gr projectile in 0.284" calls for a 1:10.0 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 | Sierra Tipped MatchKing 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.