Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 130gr | Speer Hot-Cor bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Hodgdon H414 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% | 57,653 psi | 89% | 2959 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,638 psi | 89% | 2992 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 58,798 psi | 90% | 3061 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,593 psi | 86% | 2995 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,747 psi | 75% | 2959 fps | 97.9% |
| Accurate 4064 | <<locked>> | 88% | 57,711 psi | 89% | 3045 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 58,450 psi | 90% | 3146 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 57,174 psi | 88% | 3077 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 58,175 psi | 89% | 3077 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,869 psi | 86% | 3120 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,767 psi | 86% | 3018 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,421 psi | 88% | 2992 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,479 psi | 88% | 3209 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,201 psi | 85% | 3048 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,448 psi | 85% | 3068 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,259 psi | 85% | 3146 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,666 psi | 87% | 3179 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,071 psi | 85% | 3110 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,759 psi | 70% | 2986 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,059 psi | 62% | 2874 fps | 96.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,112 psi | 80% | 3176 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,043 psi | 88% | 3091 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 55,985 psi | 86% | 3061 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,724 psi | 86% | 3038 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,116 psi | 88% | 2999 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,666 psi | 86% | 3051 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,579 psi | 87% | 3077 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 94% | 57,058 psi | 88% | 3140 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 92% | 57,072 psi | 88% | 3097 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 84% | 57,783 psi | 89% | 3087 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,361 psi | 85% | 3068 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,943 psi | 89% | 3123 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,537 psi | 89% | 3179 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,897 psi | 55% | 1906 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,274 psi | 85% | 3031 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,262 psi | 90% | 3064 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,754 psi | 89% | 3061 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,203 psi | 88% | 3041 fps | 98.5% |
| IMR 4350 | <<locked>> | 96% | 56,449 psi | 87% | 3068 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,551 psi | 89% | 3071 fps | 98.4% |
| IMR 4831 | <<locked>> | 98% | 58,755 psi | 90% | 3136 fps | 99.9% |
| IMR 4895 | <<locked>> | 86% | 56,898 psi | 88% | 3100 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,767 psi | 86% | 3018 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,479 psi | 88% | 3048 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,970 psi | 86% | 2995 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,754 psi | 89% | 3054 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,116 psi | 88% | 3061 fps | 99.3% |
| Lovex S070 | <<locked>> | 96% | 58,378 psi | 90% | 3104 fps | 98.8% |
| Norma 201 | <<locked>> | 84% | 55,724 psi | 86% | 3015 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,449 psi | 87% | 3015 fps | 100% |
| Norma 203B | <<locked>> | 88% | 58,392 psi | 90% | 3110 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,276 psi | 88% | 3120 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 51,358 psi | 79% | 3123 fps | 97.6% |
| Norma URP | <<locked>> | 96% | 56,855 psi | 87% | 3127 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 55,579 psi | 86% | 3081 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,782 psi | 86% | 3123 fps | 99% |
| Ramshot TAC | <<locked>> | 82% | 56,028 psi | 86% | 3041 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,057 psi | 86% | 3061 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,666 psi | 56% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,855 psi | 87% | 3061 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,420 psi | 87% | 3140 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,347 psi | 87% | 3176 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 58,189 psi | 90% | 3166 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,116 psi | 88% | 3199 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 56,579 psi | 87% | 2995 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,463 psi | 87% | 3018 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,130 psi | 86% | 3061 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,827 psi | 89% | 3094 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,085 psi | 83% | 3091 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 92% | 55,724 psi | 86% | 3038 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,116 psi | 88% | 3061 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,479 psi | 88% | 3048 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,754 psi | 89% | 3054 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 58,378 psi | 90% | 3104 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,885 psi | 89% | 3123 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 58,740 psi | 90% | 3081 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,477 psi | 85% | 3041 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,884 psi | 88% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,624 psi | 89% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,392 psi | 88% | 3015 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,592 psi | 82% | 3087 fps | 96.6% |
| Somchem S335 | <<locked>> | 84% | 56,362 psi | 87% | 2946 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 58,117 psi | 89% | 3064 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,941 psi | 86% | 3051 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,608 psi | 86% | 3127 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,665 psi | 84% | 3064 fps | 97.6% |
| Vihtavuori N133 | <<locked>> | 84% | 57,290 psi | 88% | 2933 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,550 psi | 87% | 2979 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,869 psi | 87% | 2989 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,479 psi | 88% | 3028 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,550 psi | 85% | 3068 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 56,376 psi | 87% | 3022 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 58,769 psi | 90% | 3038 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,378 psi | 90% | 3127 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,981 psi | 78% | 3068 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,637 psi | 86% | 3038 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,695 psi | 87% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,334 psi | 88% | 3146 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,104 psi | 63% | 3012 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,709 psi | 86% | 3051 fps | 100% |
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% | 54,273 psi | 83% | 2913 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,311 psi | 73% | 2838 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 55,013 psi | 85% | 3005 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,600 psi | 70% | 2815 fps | 95.3% |
| Accurate 3100 | <<locked>> | 94% | 39,407 psi | 61% | 2776 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 44,715 psi | 69% | 2838 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,489 psi | 52% | 2654 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 50,227 psi | 77% | 2959 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 42,670 psi | 66% | 2799 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 96% | 49,081 psi | 76% | 2995 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,301 psi | 80% | 2963 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,838 psi | 83% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,427 psi | 71% | 3009 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,873 psi | 66% | 2825 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,832 psi | 71% | 2894 fps | 99.1% |
| Alliant Reloder-16 | 49.6 gr | 80% | 33,272 psi | 51% | 2667 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,347 psi | 57% | 2802 fps | 98.5% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,254 psi | 74% | 2986 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,327 psi | 45% | 2572 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,550 psi | 58% | 2812 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 90% | 36,260 psi | 56% | 2825 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,922 psi | 77% | 2969 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 42,975 psi | 66% | 2838 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 46,093 psi | 71% | 2861 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,635 psi | 83% | 2946 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,909 psi | 80% | 2989 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,410 psi | 67% | 2838 fps | 97.8% |
| Hodgdon H414 | 56.2 gr | 86% | 43,729 psi | 67% | 2894 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 86% | 46,949 psi | 72% | 2917 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 50,792 psi | 78% | 2972 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,792 psi | 47% | 2566 fps | 96.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,268 psi | 73% | 2946 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 43,091 psi | 66% | 2907 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,934 psi | 41% | 1709 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,733 psi | 75% | 2923 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 51,082 psi | 79% | 2963 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,817 psi | 69% | 2838 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,224 psi | 73% | 2864 fps | 96.6% |
| IMR 4350 | <<locked>> | 88% | 43,830 psi | 67% | 2835 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,192 psi | 65% | 2782 fps | 95.1% |
| IMR 4831 | <<locked>> | 82% | 34,780 psi | 54% | 2671 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 47,007 psi | 72% | 2927 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 52,301 psi | 80% | 2963 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,299 psi | 77% | 2940 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,487 psi | 76% | 2887 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 44,933 psi | 69% | 2838 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 37,072 psi | 57% | 2671 fps | 95% |
| Lovex S070 | <<locked>> | 86% | 42,670 psi | 66% | 2815 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 49,197 psi | 76% | 2910 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,763 psi | 77% | 2910 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,208 psi | 70% | 2884 fps | 99.4% |
| Norma 204 | <<locked>> | 92% | 50,024 psi | 77% | 2995 fps | 95.3% |
| Norma MRP | <<locked>> | 96% | 44,831 psi | 69% | 2992 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 33,678 psi | 52% | 2657 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 45,179 psi | 70% | 2900 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 39,900 psi | 61% | 2815 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 52,402 psi | 81% | 2979 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,286 psi | 80% | 2999 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,296 psi | 42% | 1749 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,714 psi | 67% | 2822 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,197 psi | 76% | 3018 fps | 99.5% |
| ReloadSwiss RS 60 | 53.4 gr | 80% | 39,711 psi | 61% | 2871 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 35,694 psi | 55% | 2733 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 37,710 psi | 58% | 2802 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 53,330 psi | 82% | 2946 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,862 psi | 72% | 2858 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 40,466 psi | 62% | 2776 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 98% | 54,114 psi | 83% | 3031 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 96% | 47,094 psi | 72% | 2963 fps | 95% |
| Rottweil R 907 | <<locked>> | 86% | 46,093 psi | 71% | 2861 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,072 psi | 57% | 2671 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,299 psi | 77% | 2940 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,933 psi | 69% | 2838 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 42,670 psi | 66% | 2815 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,452 psi | 64% | 2828 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,039 psi | 79% | 2956 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,805 psi | 75% | 2930 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,299 psi | 77% | 2851 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,293 psi | 65% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,452 psi | 64% | 2726 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 49,980 psi | 77% | 3022 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 49,879 psi | 77% | 2848 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,792 psi | 78% | 2949 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 40,915 psi | 63% | 2779 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 30,139 psi | 46% | 2602 fps | 97.4% |
| Somchem S385 | <<locked>> | 94% | 44,933 psi | 69% | 2890 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 50,778 psi | 78% | 2838 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,876 psi | 72% | 2831 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,224 psi | 73% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,073 psi | 60% | 2710 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 34,954 psi | 54% | 2661 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 52,736 psi | 81% | 2966 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,484 psi | 70% | 2828 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,476 psi | 53% | 2657 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 86% | 32,010 psi | 49% | 2654 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,505 psi | 53% | 2631 fps | 97.8% |
| Winchester 748 | <<locked>> | 80% | 53,069 psi | 82% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 43,729 psi | 67% | 2894 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,573 psi | 45% | 2664 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,646 psi | 75% | 2936 fps | 99.9% |
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 Hot-Cor. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,209 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 60, Hodgdon H414, Alliant Reloder-16 rank at the top here: for .280 Ackley Improved with the .284 | 130gr | Speer Hot-Cor 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.