Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 140gr | NorthFork Bonded Core bullet and 104 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-16 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 2015 | <<locked>> | 82% | 58,566 psi | 90% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 58,160 psi | 89% | 2884 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,449 psi | 87% | 2900 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,240 psi | 76% | 2867 fps | 98.5% |
| Accurate 4064 | <<locked>> | 88% | 58,392 psi | 90% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,463 psi | 85% | 2992 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 57,870 psi | 89% | 2972 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,332 psi | 85% | 2923 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,594 psi | 87% | 3028 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,347 psi | 87% | 2913 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 58,146 psi | 89% | 2884 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 58,291 psi | 90% | 3104 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,854 psi | 86% | 2946 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,347 psi | 87% | 2969 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,188 psi | 86% | 3048 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,609 psi | 89% | 3077 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,564 psi | 85% | 3012 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,182 psi | 76% | 2949 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,340 psi | 71% | 2894 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,596 psi | 62% | 2795 fps | 97.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,924 psi | 81% | 3084 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,943 psi | 89% | 2992 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,826 psi | 87% | 2963 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,182 psi | 76% | 2949 fps | 96.2% |
| Bofors RP7 | <<locked>> | 92% | 56,318 psi | 87% | 2940 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,827 psi | 89% | 2897 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,347 psi | 87% | 2946 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,450 psi | 88% | 2979 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 57,914 psi | 89% | 3045 fps | 99% |
| Hodgdon H4350 | <<locked>> | 92% | 57,914 psi | 89% | 3002 fps | 98% |
| Hodgdon H4895 | <<locked>> | 84% | 58,523 psi | 90% | 2982 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,434 psi | 87% | 2972 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 58,566 psi | 90% | 3018 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 58,334 psi | 90% | 3084 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,172 psi | 56% | 1827 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,941 psi | 86% | 2930 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,434 psi | 85% | 2910 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 58,247 psi | 90% | 2956 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,827 psi | 89% | 2940 fps | 98.9% |
| IMR 4350 | <<locked>> | 96% | 57,145 psi | 88% | 2972 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 58,146 psi | 89% | 2972 fps | 98.9% |
| IMR 4831 | <<locked>> | 96% | 55,738 psi | 86% | 2979 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 57,769 psi | 89% | 2999 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,347 psi | 87% | 2913 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 58,146 psi | 89% | 2943 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,739 psi | 87% | 2894 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 58,334 psi | 90% | 2946 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,841 psi | 89% | 2963 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 55,506 psi | 85% | 2949 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,915 psi | 63% | 2713 fps | 96.6% |
| Norma 201 | <<locked>> | 84% | 56,318 psi | 87% | 2910 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,043 psi | 88% | 2910 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,579 psi | 86% | 2956 fps | 100% |
| Norma 204 | <<locked>> | 96% | 58,001 psi | 89% | 3025 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 52,141 psi | 80% | 3038 fps | 98.2% |
| Norma URP | <<locked>> | 96% | 57,899 psi | 89% | 3031 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 56,318 psi | 87% | 2979 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,521 psi | 87% | 3028 fps | 99.4% |
| Ramshot TAC | <<locked>> | 82% | 56,739 psi | 87% | 2943 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,753 psi | 87% | 2959 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,782 psi | 57% | 1870 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,537 psi | 89% | 2963 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,130 psi | 88% | 3038 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 57,116 psi | 88% | 3071 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,100 psi | 85% | 3009 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,769 psi | 89% | 3100 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 57,116 psi | 88% | 2887 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,072 psi | 88% | 2913 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,710 psi | 87% | 2956 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 58,465 psi | 90% | 2999 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,868 psi | 84% | 2999 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 92% | 56,318 psi | 87% | 2940 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,841 psi | 89% | 2963 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 58,146 psi | 89% | 2943 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 58,334 psi | 90% | 2946 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,506 psi | 85% | 2949 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 58,465 psi | 90% | 3018 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,448 psi | 85% | 2920 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,115 psi | 86% | 2940 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,522 psi | 88% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 58,044 psi | 89% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 58,015 psi | 89% | 2917 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,360 psi | 84% | 2992 fps | 97.3% |
| Somchem S335 | <<locked>> | 84% | 56,884 psi | 88% | 2838 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,230 psi | 85% | 2910 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,695 psi | 87% | 2949 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,681 psi | 87% | 3031 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,492 psi | 85% | 2976 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 84% | 57,943 psi | 89% | 2825 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,130 psi | 88% | 2871 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,682 psi | 89% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 58,160 psi | 89% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,478 psi | 87% | 2969 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,747 psi | 73% | 2828 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 82% | 57,000 psi | 88% | 2917 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,811 psi | 86% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,463 psi | 85% | 2976 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,721 psi | 80% | 2972 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,188 psi | 86% | 2940 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,595 psi | 89% | 2969 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,914 psi | 89% | 3045 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,727 psi | 64% | 2933 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,173 psi | 86% | 2946 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,011 psi | 80% | 2907 fps | 96.5% |
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 2015 | <<locked>> | 80% | 54,998 psi | 85% | 2808 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 48,109 psi | 74% | 2743 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,137 psi | 71% | 2726 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 37,376 psi | 58% | 2638 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 45,542 psi | 70% | 2746 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,084 psi | 52% | 2579 fps | 96.2% |
| ADI AR 2206H | <<locked>> | 80% | 50,865 psi | 78% | 2864 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,323 psi | 67% | 2710 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 46,659 psi | 72% | 2851 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,939 psi | 81% | 2861 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,418 psi | 84% | 2838 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,166 psi | 73% | 2917 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,424 psi | 67% | 2733 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,456 psi | 71% | 2802 fps | 99.5% |
| Alliant Reloder-16 | 47.5 gr | 80% | 33,678 psi | 52% | 2585 fps | 96.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,927 psi | 58% | 2720 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,963 psi | 71% | 2841 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,093 psi | 71% | 2887 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,833 psi | 43% | 2441 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,839 psi | 55% | 2677 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,243 psi | 53% | 2680 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,473 psi | 78% | 2874 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,656 psi | 67% | 2746 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 46,093 psi | 71% | 2887 fps | 95.3% |
| Bofors RP7 | <<locked>> | 84% | 43,845 psi | 67% | 2717 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,418 psi | 84% | 2844 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,663 psi | 81% | 2890 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,121 psi | 68% | 2749 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 41,452 psi | 64% | 2746 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 44,672 psi | 69% | 2769 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 51,445 psi | 79% | 2874 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,183 psi | 48% | 2484 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,921 psi | 74% | 2854 fps | 100% |
| Hodgdon Superformance | 58.2 gr | 86% | 43,685 psi | 67% | 2822 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 42% | 1634 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,342 psi | 76% | 2825 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,924 psi | 80% | 2858 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,498 psi | 70% | 2746 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,834 psi | 74% | 2772 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 41,698 psi | 64% | 2694 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,001 psi | 62% | 2638 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 32,967 psi | 51% | 2536 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 47,659 psi | 73% | 2835 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,939 psi | 81% | 2861 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,923 psi | 78% | 2838 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,198 psi | 77% | 2792 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,687 psi | 70% | 2746 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,695 psi | 58% | 2589 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 40,669 psi | 63% | 2674 fps | 95.7% |
| Lovex S071 | <<locked>> | 98% | 38,435 psi | 59% | 2661 fps | 95.9% |
| Norma 201 | <<locked>> | 80% | 49,966 psi | 77% | 2812 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,314 psi | 77% | 2812 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,832 psi | 71% | 2789 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 47,253 psi | 73% | 2844 fps | 95.2% |
| Norma MRP | <<locked>> | 94% | 42,438 psi | 65% | 2844 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 34,214 psi | 53% | 2579 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 80% | 45,905 psi | 71% | 2808 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 37,840 psi | 58% | 2674 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 52,910 psi | 81% | 2881 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,084 psi | 82% | 2900 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 42% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,295 psi | 68% | 2733 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,864 psi | 77% | 2920 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,321 psi | 62% | 2782 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,866 psi | 52% | 2595 fps | 95.7% |
| ReloadSwiss RS 70 | 53.3 gr | 82% | 35,621 psi | 55% | 2654 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 53,969 psi | 83% | 2841 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,529 psi | 73% | 2762 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,017 psi | 63% | 2687 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 51,474 psi | 79% | 2884 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 94% | 44,730 psi | 69% | 2818 fps | 95% |
| Rottweil R 907 | <<locked>> | 84% | 43,845 psi | 67% | 2717 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,695 psi | 58% | 2589 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,923 psi | 78% | 2838 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,687 psi | 70% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,669 psi | 63% | 2674 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,989 psi | 65% | 2736 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,808 psi | 80% | 2864 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,385 psi | 76% | 2831 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,850 psi | 78% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,801 psi | 66% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,407 psi | 61% | 2585 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 47,326 psi | 73% | 2871 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 50,633 psi | 78% | 2749 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,329 psi | 79% | 2851 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,611 psi | 64% | 2690 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 30,806 psi | 47% | 2533 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 42,757 psi | 66% | 2746 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 51,358 psi | 79% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,558 psi | 73% | 2733 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,805 psi | 74% | 2743 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,595 psi | 61% | 2621 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,520 psi | 55% | 2579 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 44,744 psi | 69% | 2772 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 53,490 psi | 82% | 2864 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,151 psi | 71% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,128 psi | 54% | 2579 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 84% | 30,501 psi | 47% | 2523 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,896 psi | 54% | 2552 fps | 98.5% |
| Winchester 748 | <<locked>> | 80% | 53,780 psi | 83% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 41,655 psi | 64% | 2753 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,137 psi | 43% | 2530 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,356 psi | 76% | 2841 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,617 psi | 75% | 2848 fps | 95.7% |
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 | 140gr | NorthFork Bonded Core. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,104 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 56–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:11.0 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, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 140gr | NorthFork Bonded Core 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.