Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 140gr | Nosler Ballistic Tip Hunting bullet and 104 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 4831, ReloadSwiss RS 70 and Alliant Reloder-16.
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% | 58,291 psi | 90% | 2851 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 58,218 psi | 90% | 2884 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,217 psi | 86% | 2897 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,052 psi | 75% | 2864 fps | 98.4% |
| Accurate 4064 | <<locked>> | 88% | 58,407 psi | 90% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,216 psi | 85% | 2986 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 57,624 psi | 89% | 2969 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 58,595 psi | 90% | 2969 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,391 psi | 87% | 3025 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,376 psi | 87% | 2917 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,827 psi | 89% | 2881 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 58,030 psi | 89% | 3100 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,637 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,086 psi | 86% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,970 psi | 86% | 3045 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,348 psi | 88% | 3074 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,317 psi | 85% | 3009 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,994 psi | 75% | 2943 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,151 psi | 71% | 2890 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,451 psi | 62% | 2792 fps | 97.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,736 psi | 81% | 3081 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,740 psi | 89% | 2989 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,623 psi | 87% | 2959 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,994 psi | 75% | 2943 fps | 96.1% |
| Bofors RP7 | <<locked>> | 92% | 56,086 psi | 86% | 2936 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,551 psi | 89% | 2890 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,144 psi | 86% | 2943 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,276 psi | 88% | 2976 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 57,696 psi | 89% | 3041 fps | 99% |
| Hodgdon H4350 | <<locked>> | 92% | 57,696 psi | 89% | 2999 fps | 98% |
| Hodgdon H4895 | <<locked>> | 84% | 58,276 psi | 90% | 2979 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,188 psi | 86% | 2969 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 58,320 psi | 90% | 3012 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 58,131 psi | 89% | 3081 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,100 psi | 56% | 1824 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,666 psi | 86% | 2927 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,158 psi | 85% | 2904 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 58,044 psi | 89% | 2953 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,580 psi | 89% | 2936 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 56,956 psi | 88% | 2969 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,928 psi | 89% | 2966 fps | 98.8% |
| IMR 4831 | <<locked>> | 96% | 55,521 psi | 85% | 2976 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 57,566 psi | 89% | 2995 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,376 psi | 87% | 2917 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,856 psi | 89% | 2940 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,507 psi | 87% | 2890 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 58,392 psi | 90% | 2949 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,624 psi | 89% | 2959 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 55,288 psi | 85% | 2943 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,727 psi | 63% | 2710 fps | 96.6% |
| Norma 201 | <<locked>> | 84% | 56,333 psi | 87% | 2910 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,087 psi | 88% | 2910 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,376 psi | 85% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,812 psi | 89% | 3022 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 51,953 psi | 80% | 3031 fps | 98.2% |
| Norma URP | <<locked>> | 96% | 57,682 psi | 89% | 3028 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 56,086 psi | 86% | 2976 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,318 psi | 87% | 3025 fps | 99.3% |
| Ramshot TAC | <<locked>> | 82% | 56,521 psi | 87% | 2940 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,507 psi | 87% | 2956 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,695 psi | 56% | 1867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,319 psi | 88% | 2959 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,174 psi | 88% | 3038 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,869 psi | 87% | 3068 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,882 psi | 84% | 3005 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,595 psi | 89% | 3097 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 57,145 psi | 88% | 2887 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,782 psi | 87% | 2907 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,434 psi | 87% | 2953 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 58,291 psi | 90% | 2995 fps | 96.6% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,636 psi | 84% | 2992 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 92% | 56,086 psi | 86% | 2936 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,624 psi | 89% | 2959 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,856 psi | 89% | 2940 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 58,392 psi | 90% | 2949 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,288 psi | 85% | 2943 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 58,233 psi | 90% | 3015 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,201 psi | 85% | 2917 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,173 psi | 86% | 2940 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,276 psi | 88% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 58,117 psi | 89% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,827 psi | 89% | 2913 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,172 psi | 83% | 2989 fps | 97.3% |
| Somchem S335 | <<locked>> | 84% | 56,927 psi | 88% | 2838 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 58,784 psi | 90% | 2963 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,463 psi | 87% | 2946 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,434 psi | 87% | 3028 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,317 psi | 85% | 2969 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 84% | 57,696 psi | 89% | 2822 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,159 psi | 88% | 2871 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,421 psi | 88% | 2884 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,914 psi | 89% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,246 psi | 87% | 2969 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,558 psi | 73% | 2825 fps | 96.2% |
| Vihtavuori N530 | <<locked>> | 82% | 56,724 psi | 87% | 2913 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,593 psi | 86% | 2881 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,259 psi | 85% | 2972 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,503 psi | 79% | 2969 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,028 psi | 86% | 2936 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,305 psi | 88% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,696 psi | 89% | 3041 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,539 psi | 64% | 2927 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,231 psi | 87% | 2946 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,793 psi | 80% | 2904 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% | 54,694 psi | 84% | 2805 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,863 psi | 74% | 2740 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,195 psi | 71% | 2726 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 37,405 psi | 58% | 2638 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 45,310 psi | 70% | 2740 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,055 psi | 52% | 2575 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 80% | 50,879 psi | 78% | 2864 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,091 psi | 66% | 2703 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 46,470 psi | 71% | 2844 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,982 psi | 82% | 2864 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,418 psi | 84% | 2835 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,978 psi | 72% | 2913 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,424 psi | 67% | 2733 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,470 psi | 71% | 2802 fps | 99.5% |
| Alliant Reloder-16 | 47.4 gr | 80% | 33,678 psi | 52% | 2589 fps | 96.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,739 psi | 58% | 2713 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,774 psi | 70% | 2835 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,701 psi | 70% | 2877 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,847 psi | 43% | 2441 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,708 psi | 55% | 2671 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,084 psi | 52% | 2677 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,517 psi | 78% | 2874 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,468 psi | 67% | 2740 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 45,701 psi | 70% | 2877 fps | 95.2% |
| Bofors RP7 | <<locked>> | 84% | 43,642 psi | 67% | 2710 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,157 psi | 83% | 2841 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,460 psi | 81% | 2890 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,918 psi | 68% | 2746 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 41,220 psi | 63% | 2740 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 84% | 44,469 psi | 68% | 2762 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 51,459 psi | 79% | 2874 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,169 psi | 48% | 2487 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,718 psi | 73% | 2848 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 43,511 psi | 67% | 2818 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,934 psi | 41% | 1631 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,095 psi | 76% | 2818 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,619 psi | 79% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,281 psi | 70% | 2743 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,601 psi | 73% | 2766 fps | 97.2% |
| IMR 4350 | <<locked>> | 86% | 41,539 psi | 64% | 2690 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,016 psi | 62% | 2638 fps | 95% |
| IMR 4831 | 48.3 gr | 80% | 32,793 psi | 50% | 2530 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 47,674 psi | 73% | 2831 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,982 psi | 82% | 2864 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,662 psi | 78% | 2835 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,951 psi | 77% | 2789 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,426 psi | 70% | 2743 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,521 psi | 58% | 2585 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 40,451 psi | 62% | 2667 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 38,247 psi | 59% | 2657 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 49,690 psi | 76% | 2808 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,328 psi | 77% | 2808 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,847 psi | 71% | 2789 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 47,050 psi | 72% | 2838 fps | 95.2% |
| Norma MRP | <<locked>> | 94% | 42,264 psi | 65% | 2841 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 33,997 psi | 52% | 2572 fps | 96% |
| Ramshot Big Game | <<locked>> | 80% | 45,672 psi | 70% | 2805 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 37,869 psi | 58% | 2674 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 52,953 psi | 81% | 2881 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,852 psi | 81% | 2897 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 42% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,063 psi | 68% | 2726 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,574 psi | 76% | 2913 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,132 psi | 62% | 2779 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,692 psi | 52% | 2592 fps | 95.6% |
| ReloadSwiss RS 70 | 53.1 gr | 82% | 35,476 psi | 55% | 2651 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 53,722 psi | 83% | 2838 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,311 psi | 73% | 2759 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,814 psi | 63% | 2684 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 96% | 51,285 psi | 79% | 2881 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 96% | 47,572 psi | 73% | 2871 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 84% | 43,642 psi | 67% | 2710 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,521 psi | 58% | 2585 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,662 psi | 78% | 2835 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,426 psi | 70% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,451 psi | 62% | 2667 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,785 psi | 64% | 2733 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,590 psi | 79% | 2858 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,153 psi | 76% | 2828 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,604 psi | 78% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,598 psi | 66% | 2608 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,218 psi | 60% | 2582 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 47,137 psi | 73% | 2864 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 50,415 psi | 78% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,387 psi | 79% | 2851 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,379 psi | 64% | 2684 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 30,618 psi | 47% | 2526 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 42,569 psi | 65% | 2743 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 51,082 psi | 79% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,268 psi | 73% | 2730 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,572 psi | 73% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,392 psi | 61% | 2615 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,520 psi | 55% | 2579 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 44,585 psi | 69% | 2769 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 53,214 psi | 82% | 2861 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,948 psi | 71% | 2733 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,925 psi | 54% | 2575 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 30,342 psi | 47% | 2520 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,896 psi | 54% | 2552 fps | 98.5% |
| Winchester 748 | <<locked>> | 80% | 53,534 psi | 82% | 2907 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 41,437 psi | 64% | 2746 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,992 psi | 43% | 2526 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,095 psi | 76% | 2835 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,399 psi | 74% | 2844 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 | Nosler Ballistic Tip Hunting. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,100 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. IMR 4831, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Nosler Ballistic Tip Hunting 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.