Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 130gr | Speer Boat-Tail 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 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.
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 2015 | <<locked>> | 82% | 58,175 psi | 89% | 2969 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,870 psi | 89% | 2999 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,970 psi | 86% | 3005 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,052 psi | 75% | 2969 fps | 98% |
| Accurate 4064 | <<locked>> | 88% | 58,218 psi | 90% | 3054 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,853 psi | 84% | 3094 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 57,290 psi | 88% | 3081 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 58,566 psi | 90% | 3087 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,202 psi | 86% | 3133 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,260 psi | 87% | 3031 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,624 psi | 89% | 2999 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,899 psi | 89% | 3215 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,666 psi | 86% | 3058 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,898 psi | 86% | 3077 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,709 psi | 86% | 3156 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,116 psi | 88% | 3186 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,390 psi | 85% | 3120 fps | 96.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,079 psi | 71% | 2995 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,321 psi | 62% | 2887 fps | 96.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,678 psi | 81% | 3189 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,435 psi | 88% | 3100 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 56,434 psi | 87% | 3071 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 56,086 psi | 86% | 3048 fps | 97.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,566 psi | 89% | 3009 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,101 psi | 86% | 3058 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,000 psi | 88% | 3087 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 57,406 psi | 88% | 3150 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 92% | 57,435 psi | 88% | 3110 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 84% | 57,957 psi | 89% | 3094 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,072 psi | 86% | 3081 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 58,392 psi | 90% | 3130 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 58,117 psi | 89% | 3192 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 55% | 1913 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,680 psi | 86% | 3041 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,523 psi | 90% | 3071 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,914 psi | 89% | 3068 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,609 psi | 89% | 3051 fps | 98.6% |
| IMR 4350 | <<locked>> | 96% | 56,797 psi | 87% | 3077 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,914 psi | 89% | 3081 fps | 98.5% |
| IMR 4831 | <<locked>> | 96% | 55,361 psi | 85% | 3087 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 57,348 psi | 88% | 3110 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,260 psi | 87% | 3031 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,885 psi | 89% | 3058 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,405 psi | 87% | 3005 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 58,218 psi | 90% | 3064 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,479 psi | 88% | 3071 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 55,361 psi | 85% | 3058 fps | 98.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,654 psi | 63% | 2805 fps | 96% |
| Norma 201 | <<locked>> | 84% | 56,202 psi | 86% | 3025 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,884 psi | 88% | 3025 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,158 psi | 85% | 3064 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,609 psi | 89% | 3130 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 51,924 psi | 80% | 3136 fps | 97.7% |
| Norma URP | <<locked>> | 96% | 57,537 psi | 89% | 3140 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 55,970 psi | 86% | 3087 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,115 psi | 86% | 3133 fps | 99.1% |
| Ramshot TAC | <<locked>> | 82% | 56,405 psi | 87% | 3051 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,478 psi | 87% | 3071 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,579 psi | 56% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,217 psi | 88% | 3071 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,869 psi | 87% | 3153 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,739 psi | 87% | 3186 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,708 psi | 84% | 3117 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,406 psi | 88% | 3205 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 56,811 psi | 87% | 3002 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,623 psi | 87% | 3025 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,579 psi | 87% | 3071 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 58,175 psi | 89% | 3104 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,433 psi | 84% | 3100 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 92% | 56,086 psi | 86% | 3048 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,479 psi | 88% | 3071 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,885 psi | 89% | 3058 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 58,218 psi | 90% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,361 psi | 85% | 3058 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 58,334 psi | 90% | 3130 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,143 psi | 85% | 3028 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,912 psi | 86% | 3051 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,101 psi | 88% | 2956 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,696 psi | 89% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,812 psi | 89% | 3025 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,940 psi | 83% | 3094 fps | 96.7% |
| Somchem S335 | <<locked>> | 84% | 56,797 psi | 87% | 2953 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 58,523 psi | 90% | 3071 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,376 psi | 87% | 3061 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,391 psi | 87% | 3143 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,230 psi | 85% | 3077 fps | 97.8% |
| Vihtavuori N133 | <<locked>> | 84% | 57,508 psi | 88% | 2940 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,782 psi | 87% | 2986 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,334 psi | 88% | 2999 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,899 psi | 89% | 3038 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,927 psi | 86% | 3077 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 82% | 56,565 psi | 87% | 3025 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,550 psi | 85% | 2995 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,317 psi | 85% | 3084 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,401 psi | 79% | 3074 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,956 psi | 86% | 3045 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,174 psi | 88% | 3077 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,711 psi | 89% | 3153 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,582 psi | 64% | 3028 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,101 psi | 86% | 3061 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,938 psi | 80% | 3012 fps | 96% |
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% | 54,476 psi | 84% | 2920 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,747 psi | 73% | 2851 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,948 psi | 71% | 2825 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 39,784 psi | 61% | 2785 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 45,194 psi | 70% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,866 psi | 52% | 2667 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 50,676 psi | 78% | 2972 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 43,047 psi | 66% | 2812 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 96% | 49,371 psi | 76% | 3009 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,736 psi | 81% | 2972 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,070 psi | 83% | 2949 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,804 psi | 72% | 3022 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,062 psi | 66% | 2835 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,224 psi | 71% | 2907 fps | 99.2% |
| Alliant Reloder-16 | 49.9 gr | 80% | 33,446 psi | 51% | 2674 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,681 psi | 58% | 2815 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,588 psi | 75% | 2992 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,443 psi | 45% | 2579 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,985 psi | 58% | 2825 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 36,564 psi | 56% | 2838 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,328 psi | 77% | 2982 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 43,178 psi | 66% | 2841 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 43,497 psi | 67% | 2812 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,041 psi | 83% | 2956 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,359 psi | 81% | 3002 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,801 psi | 67% | 2851 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 44,121 psi | 68% | 2907 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 86% | 47,326 psi | 73% | 2927 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 51,198 psi | 79% | 2982 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,980 psi | 48% | 2572 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,703 psi | 73% | 2959 fps | 99.9% |
| Hodgdon Superformance | 61.1 gr | 86% | 43,395 psi | 67% | 2917 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,919 psi | 41% | 1709 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,936 psi | 75% | 2930 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 51,329 psi | 79% | 2966 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,252 psi | 70% | 2848 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,616 psi | 73% | 2874 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 44,135 psi | 68% | 2848 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,351 psi | 65% | 2789 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 32,634 psi | 50% | 2618 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 47,413 psi | 73% | 2940 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 52,736 psi | 81% | 2972 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,488 psi | 78% | 2946 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,937 psi | 77% | 2900 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 45,353 psi | 70% | 2851 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 37,420 psi | 58% | 2680 fps | 95.2% |
| Lovex S070 | <<locked>> | 84% | 40,509 psi | 62% | 2769 fps | 95% |
| Lovex S071 | <<locked>> | 98% | 38,101 psi | 59% | 2746 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 49,632 psi | 76% | 2917 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,937 psi | 77% | 2917 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,600 psi | 70% | 2894 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 50,401 psi | 78% | 3005 fps | 95.5% |
| Norma MRP | <<locked>> | 94% | 42,206 psi | 65% | 2940 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 33,866 psi | 52% | 2664 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 45,556 psi | 70% | 2910 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 40,219 psi | 62% | 2828 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 52,794 psi | 81% | 2992 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,721 psi | 81% | 3009 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,282 psi | 42% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,874 psi | 67% | 2828 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,429 psi | 76% | 3025 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,103 psi | 62% | 2884 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 36,056 psi | 55% | 2743 fps | 95.9% |
| ReloadSwiss RS 70 | 57.3 gr | 84% | 37,840 psi | 58% | 2808 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 53,548 psi | 82% | 2953 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,036 psi | 72% | 2864 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,625 psi | 63% | 2785 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 98% | 54,433 psi | 84% | 3041 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 96% | 47,703 psi | 73% | 2979 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 84% | 43,497 psi | 67% | 2812 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,420 psi | 58% | 2680 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,488 psi | 78% | 2946 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,353 psi | 70% | 2851 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 40,509 psi | 62% | 2769 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,626 psi | 64% | 2835 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,401 psi | 79% | 2966 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,994 psi | 75% | 2936 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,517 psi | 78% | 2858 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,467 psi | 65% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,771 psi | 64% | 2736 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 47,253 psi | 73% | 2972 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 50,314 psi | 77% | 2858 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,213 psi | 79% | 2959 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 41,307 psi | 64% | 2789 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 30,458 psi | 47% | 2615 fps | 97.6% |
| Somchem S385 | <<locked>> | 94% | 45,295 psi | 70% | 2900 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 50,966 psi | 78% | 2844 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,123 psi | 72% | 2838 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,384 psi | 73% | 2848 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,262 psi | 60% | 2713 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 35,317 psi | 54% | 2671 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 52,939 psi | 81% | 2969 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,890 psi | 71% | 2838 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,838 psi | 54% | 2671 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 86% | 32,198 psi | 50% | 2664 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,780 psi | 54% | 2641 fps | 98% |
| Winchester 748 | <<locked>> | 80% | 53,548 psi | 82% | 3025 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 41,263 psi | 63% | 2844 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,791 psi | 46% | 2674 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,052 psi | 75% | 2946 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,196 psi | 74% | 2943 fps | 95% |
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 117 powders for .280 Ackley Improved loaded with the .284 | 130gr | Speer Boat-Tail. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,215 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,215 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 130.0 gr projectile in 0.284" calls for a 1:13.5 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 | 130gr | Speer Boat-Tail 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.