Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 140gr | Remington PSP bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, 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.
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% | 57,682 psi | 89% | 2890 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,274 psi | 85% | 2904 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,953 psi | 81% | 2943 fps | 99.2% |
| Accurate 4064 | <<locked>> | 86% | 58,117 psi | 89% | 2946 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,027 psi | 85% | 2999 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 56,913 psi | 88% | 2976 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,073 psi | 89% | 2979 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,304 psi | 87% | 3041 fps | 97.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,867 psi | 83% | 3028 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,609 psi | 89% | 3107 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 58,798 psi | 90% | 3002 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,637 psi | 86% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,695 psi | 86% | 3054 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,348 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,419 psi | 85% | 3025 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,649 psi | 81% | 3025 fps | 97.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,647 psi | 76% | 2963 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,221 psi | 66% | 2871 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,276 psi | 88% | 3163 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,913 psi | 88% | 2992 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,225 psi | 74% | 2943 fps | 96.2% |
| Bofors RP3 | <<locked>> | 86% | 56,304 psi | 87% | 2969 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,649 psi | 81% | 3025 fps | 97.4% |
| Bofors RP7 | <<locked>> | 90% | 55,666 psi | 86% | 2949 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 86% | 56,739 psi | 87% | 2986 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 57,435 psi | 88% | 3054 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 90% | 57,203 psi | 88% | 3012 fps | 98.2% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,769 psi | 89% | 3035 fps | 96.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,579 psi | 87% | 3015 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 57,537 psi | 89% | 2982 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,173 psi | 86% | 2979 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,943 psi | 89% | 3022 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 58,015 psi | 89% | 3094 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,318 psi | 56% | 1850 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 58,581 psi | 90% | 2986 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 58,218 psi | 90% | 2959 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,392 psi | 88% | 2959 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,681 psi | 87% | 2943 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 56,550 psi | 87% | 2982 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,406 psi | 88% | 2979 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 55,463 psi | 85% | 2989 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,087 psi | 88% | 3002 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,782 psi | 86% | 2966 fps | 96% |
| Lovex D073.6 | <<locked>> | 82% | 57,450 psi | 88% | 2946 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,738 psi | 86% | 2897 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,827 psi | 89% | 2956 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,217 psi | 88% | 2969 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 58,798 psi | 90% | 3015 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,961 psi | 68% | 2785 fps | 97.7% |
| Norma 201 | <<locked>> | 82% | 55,738 psi | 86% | 2920 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,202 psi | 86% | 2910 fps | 100% |
| Norma 203B | <<locked>> | 86% | 58,537 psi | 90% | 3012 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,479 psi | 88% | 3035 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 55,985 psi | 86% | 3114 fps | 99.1% |
| Norma URP | <<locked>> | 94% | 57,537 psi | 89% | 3041 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,622 psi | 86% | 2986 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,246 psi | 87% | 3038 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,035 psi | 71% | 2877 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,927 psi | 57% | 1893 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,579 psi | 87% | 2966 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,536 psi | 87% | 3041 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,695 psi | 87% | 3074 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,071 psi | 85% | 3022 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,479 psi | 88% | 3110 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 56,159 psi | 86% | 2917 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,173 psi | 86% | 2963 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,885 psi | 89% | 3009 fps | 97% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 58,392 psi | 90% | 3071 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 90% | 55,666 psi | 86% | 2949 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,217 psi | 88% | 2969 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,450 psi | 88% | 2946 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,827 psi | 89% | 2956 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 58,798 psi | 90% | 3015 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,914 psi | 89% | 3025 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 58,175 psi | 89% | 2979 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,303 psi | 85% | 2943 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,333 psi | 87% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,392 psi | 88% | 2848 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,276 psi | 88% | 2927 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,885 psi | 89% | 3068 fps | 98.2% |
| Somchem S335 | <<locked>> | 82% | 56,217 psi | 86% | 2844 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,899 psi | 89% | 2963 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,159 psi | 86% | 2956 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,028 psi | 86% | 2943 fps | 95.8% |
| Somchem S365 | <<locked>> | 96% | 56,782 psi | 87% | 3041 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,347 psi | 85% | 2989 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 56,811 psi | 87% | 2828 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,434 psi | 87% | 2874 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,942 psi | 88% | 2890 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,580 psi | 89% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,898 psi | 86% | 2979 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,111 psi | 79% | 2900 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 86% | 58,755 psi | 90% | 2936 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 58,682 psi | 90% | 3035 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,535 psi | 85% | 3041 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,347 psi | 87% | 3100 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,608 psi | 86% | 2946 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,435 psi | 88% | 3054 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,889 psi | 69% | 3015 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,622 psi | 86% | 2953 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,695 psi | 86% | 2982 fps | 97.6% |
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% | 50,749 psi | 78% | 2792 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,689 psi | 75% | 2792 fps | 97.1% |
| Accurate 3100 | <<locked>> | 88% | 35,186 psi | 54% | 2595 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,022 psi | 74% | 2795 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,463 psi | 56% | 2644 fps | 97.3% |
| ADI AR 2206H | <<locked>> | 80% | 53,403 psi | 82% | 2920 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,397 psi | 70% | 2766 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 46,122 psi | 71% | 2858 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 98% | 50,357 psi | 77% | 2963 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,096 psi | 77% | 2986 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,876 psi | 71% | 2792 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,921 psi | 75% | 2861 fps | 99.8% |
| Alliant Reloder-16 | 50.2 gr | 80% | 35,694 psi | 55% | 2654 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,263 psi | 62% | 2785 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,600 psi | 70% | 2848 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,035 psi | 71% | 2900 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,891 psi | 43% | 2454 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,766 psi | 55% | 2690 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 86% | 34,214 psi | 53% | 2694 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,185 psi | 82% | 2933 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 45,121 psi | 69% | 2881 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,180 psi | 71% | 2805 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,035 psi | 71% | 2900 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 40,741 psi | 63% | 2667 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 46,441 psi | 71% | 2808 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 38,551 psi | 59% | 2694 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 44,251 psi | 68% | 2776 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 98% | 53,969 psi | 83% | 2972 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,881 psi | 81% | 2953 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 53,969 psi | 83% | 2930 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,112 psi | 51% | 2546 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,647 psi | 78% | 2910 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,147 psi | 62% | 2759 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 42% | 1657 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,517 psi | 79% | 2877 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,723 psi | 84% | 2910 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,761 psi | 73% | 2802 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,980 psi | 77% | 2828 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 41,307 psi | 64% | 2700 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,076 psi | 65% | 2697 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 35,157 psi | 54% | 2598 fps | 97% |
| IMR 4895 | <<locked>> | 80% | 50,169 psi | 77% | 2890 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,344 psi | 81% | 2907 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 53,795 psi | 83% | 2897 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,344 psi | 81% | 2844 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,935 psi | 74% | 2799 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,595 psi | 61% | 2648 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 37,913 psi | 58% | 2625 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 36,129 psi | 56% | 2618 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,272 psi | 80% | 2864 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,939 psi | 81% | 2864 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,269 psi | 74% | 2848 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 46,847 psi | 72% | 2851 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 39,552 psi | 61% | 2792 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 36,419 psi | 56% | 2641 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 48,675 psi | 75% | 2871 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 37,637 psi | 58% | 2680 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 98% | 42,685 psi | 66% | 2808 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,615 psi | 42% | 1693 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,615 psi | 72% | 2795 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,895 psi | 81% | 2986 fps | 100% |
| ReloadSwiss RS 60 | 54 gr | 80% | 42,801 psi | 66% | 2844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,230 psi | 56% | 2661 fps | 96.9% |
| ReloadSwiss RS 70 | 54.9 gr | 80% | 35,331 psi | 54% | 2664 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 49,850 psi | 77% | 2815 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,497 psi | 67% | 2749 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 51,024 psi | 78% | 2894 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 92% | 44,759 psi | 69% | 2831 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 40,741 psi | 63% | 2667 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,595 psi | 61% | 2648 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,795 psi | 83% | 2897 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,935 psi | 74% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,913 psi | 58% | 2625 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,512 psi | 68% | 2802 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 54,592 psi | 84% | 2923 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,895 psi | 80% | 2890 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,982 psi | 82% | 2795 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,788 psi | 69% | 2661 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,696 psi | 60% | 2589 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,338 psi | 68% | 2825 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 52,852 psi | 81% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,070 psi | 83% | 2907 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,772 psi | 67% | 2746 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 52,620 psi | 81% | 2887 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 32,721 psi | 50% | 2592 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 42,598 psi | 66% | 2756 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 53,505 psi | 82% | 2782 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,908 psi | 77% | 2779 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,314 psi | 77% | 2795 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,887 psi | 64% | 2677 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,710 psi | 58% | 2641 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 94% | 41,785 psi | 64% | 2730 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 48,414 psi | 74% | 2782 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,144 psi | 57% | 2638 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 30,676 psi | 47% | 2533 fps | 95.7% |
| Vihtavuori N560 | <<locked>> | 98% | 52,460 psi | 81% | 3031 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,912 psi | 57% | 2612 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 38,551 psi | 59% | 2694 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,065 psi | 43% | 2543 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,866 psi | 80% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,020 psi | 69% | 2799 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 111 powders for .280 Ackley Improved loaded with the .284 | 140gr | Remington PSP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,163 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,163 fps. Accurate 3100 gives the best case fill at 100 %, and 111 of the 111 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:15.0 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 60, ReloadSwiss RS 70, Alliant Reloder-16 rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Remington PSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, 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.