Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 120gr | Barnes TSX BT bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, Hodgdon Superformance and ReloadSwiss RS 60.
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>> | 84% | 56,159 psi | 86% | 3058 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 58,305 psi | 90% | 3133 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,824 psi | 84% | 3074 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 57,203 psi | 88% | 3153 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 58,117 psi | 89% | 3133 fps | 97.1% |
| Accurate 4064 | <<locked>> | 90% | 55,201 psi | 85% | 3127 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,680 psi | 86% | 3215 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 86% | 55,724 psi | 86% | 3163 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,710 psi | 87% | 3163 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 58,262 psi | 90% | 3169 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,550 psi | 85% | 3091 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,695 psi | 86% | 3287 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 56,956 psi | 88% | 3186 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 57,537 psi | 89% | 3212 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,797 psi | 87% | 3278 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 58,653 psi | 90% | 3323 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,567 psi | 62% | 2976 fps | 98.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,948 psi | 71% | 3156 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,825 psi | 86% | 3179 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 57,870 psi | 89% | 3205 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 57,537 psi | 89% | 3166 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,144 psi | 86% | 3094 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 57,986 psi | 89% | 3199 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,231 psi | 87% | 3248 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 58,784 psi | 90% | 3159 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 58,769 psi | 90% | 3219 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 54,868 psi | 84% | 3209 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 94% | 55,332 psi | 85% | 3169 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 86% | 56,289 psi | 87% | 3176 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,084 psi | 82% | 3140 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,115 psi | 86% | 3212 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,796 psi | 86% | 3248 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,273 psi | 54% | 1969 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,798 psi | 89% | 3182 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,449 psi | 87% | 3159 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,188 psi | 86% | 3146 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,246 psi | 87% | 3123 fps | 97.5% |
| IMR 4350ᴾ | <<locked>> | 100% | 58,262 psi | 90% | 3196 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,144 psi | 86% | 3146 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,391 psi | 87% | 3205 fps | 99.5% |
| IMR 4895 | <<locked>> | 88% | 55,216 psi | 85% | 3186 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 58,262 psi | 90% | 3169 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 58,392 psi | 90% | 3150 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,434 psi | 85% | 3136 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 58,450 psi | 90% | 3143 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,159 psi | 86% | 3143 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,317 psi | 85% | 3136 fps | 98.5% |
| Lovex S070 | <<locked>> | 98% | 56,391 psi | 87% | 3173 fps | 97.8% |
| Norma 201 | <<locked>> | 88% | 57,638 psi | 89% | 3156 fps | 100% |
| Norma 202 | <<locked>> | 88% | 58,436 psi | 90% | 3159 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,739 psi | 87% | 3199 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 58,552 psi | 90% | 3261 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 57,827 psi | 89% | 3228 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 57,435 psi | 88% | 3258 fps | 98.6% |
| Ramshot TAC | <<locked>> | 86% | 58,755 psi | 90% | 3189 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 58,581 psi | 90% | 3209 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,347 psi | 85% | 3110 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,926 psi | 55% | 2018 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 57,609 psi | 89% | 3150 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,419 psi | 85% | 3140 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 58,334 psi | 90% | 3287 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 58,320 psi | 90% | 3323 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,811 psi | 86% | 3238 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 55,129 psi | 85% | 3268 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 86% | 58,378 psi | 90% | 3140 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 58,392 psi | 90% | 3159 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 57,711 psi | 89% | 3196 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 57,537 psi | 89% | 3166 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,317 psi | 85% | 3136 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,434 psi | 85% | 3136 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,159 psi | 86% | 3143 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,391 psi | 87% | 3173 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,854 psi | 86% | 3202 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 57,130 psi | 88% | 3163 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 57,740 psi | 89% | 3189 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,593 psi | 86% | 3041 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,217 psi | 86% | 3041 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,840 psi | 86% | 3091 fps | 97.4% |
| Somchem S321 | <<locked>> | 82% | 55,912 psi | 86% | 3143 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 58,508 psi | 90% | 3087 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,884 psi | 88% | 3153 fps | 99.9% |
| Somchem S355 | <<locked>> | 94% | 57,711 psi | 89% | 3189 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,750 psi | 81% | 3202 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 55,405 psi | 85% | 3005 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,927 psi | 86% | 3028 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 58,160 psi | 89% | 3120 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,448 psi | 85% | 3084 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,898 psi | 86% | 3117 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 57,348 psi | 88% | 3202 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 84% | 55,085 psi | 85% | 3114 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 57,319 psi | 88% | 3130 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,188 psi | 86% | 3202 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,672 psi | 69% | 3058 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 57,943 psi | 89% | 3179 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,303 psi | 85% | 3163 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,172 psi | 85% | 3215 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,289 psi | 56% | 2966 fps | 98.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 57,827 psi | 89% | 3196 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% | 49,443 psi | 76% | 2953 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 54,491 psi | 84% | 3081 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,843 psi | 64% | 2858 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 49,530 psi | 76% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 50,850 psi | 78% | 3009 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 39,610 psi | 61% | 2848 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 36,216 psi | 56% | 2825 fps | 95.2% |
| ADI AR 2206H | <<locked>> | 80% | 45,788 psi | 70% | 2986 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 38,812 psi | 60% | 2812 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,950 psi | 74% | 2995 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 48,588 psi | 75% | 2986 fps | 100% |
| Alliant Power Pro 2000-MR | 53.5 gr | 80% | 41,974 psi | 65% | 3012 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,580 psi | 59% | 2835 fps | 98.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,423 psi | 64% | 2907 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 36,303 psi | 56% | 2844 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,417 psi | 51% | 2789 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 94% | 33,388 psi | 51% | 2785 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 39,610 psi | 61% | 3005 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,266 psi | 70% | 2986 fps | 98% |
| Bofors RP3 | <<locked>> | 80% | 38,290 psi | 59% | 2838 fps | 98.2% |
| Bofors RP7 | <<locked>> | 92% | 50,821 psi | 78% | 3051 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,487 psi | 76% | 2982 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,079 psi | 72% | 3015 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,243 psi | 80% | 3179 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 55,187 psi | 85% | 3107 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,088 psi | 60% | 2841 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 92% | 48,037 psi | 74% | 3084 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 92% | 52,040 psi | 80% | 3110 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 46,238 psi | 71% | 2995 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,096 psi | 48% | 2664 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,366 psi | 65% | 2959 fps | 99% |
| Hodgdon Superformance | 64 gr | 92% | 48,051 psi | 74% | 3104 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 40% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,309 psi | 68% | 2943 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 46,021 psi | 71% | 2992 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,756 psi | 63% | 2854 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 46,369 psi | 71% | 2943 fps | 95.3% |
| IMR 4350 | <<locked>> | 94% | 48,153 psi | 74% | 3018 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 46,572 psi | 72% | 2969 fps | 95.2% |
| IMR 4831 | <<locked>> | 88% | 37,594 psi | 58% | 2841 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 42,453 psi | 65% | 2943 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 47,950 psi | 74% | 2995 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 54,578 psi | 84% | 3091 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,976 psi | 69% | 2956 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,600 psi | 70% | 2917 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 40,596 psi | 62% | 2854 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 40,393 psi | 62% | 2844 fps | 95.1% |
| Lovex S070 | <<locked>> | 92% | 46,557 psi | 72% | 2992 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 44,643 psi | 69% | 2930 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 45,194 psi | 70% | 2943 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,799 psi | 63% | 2894 fps | 97.9% |
| Norma URP | <<locked>> | 86% | 36,521 psi | 56% | 2828 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 40,654 psi | 63% | 2907 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 43,671 psi | 67% | 2999 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 47,935 psi | 74% | 2999 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,776 psi | 74% | 3025 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,851 psi | 80% | 3051 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,498 psi | 41% | 1801 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 53,853 psi | 83% | 3087 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 45,150 psi | 69% | 2949 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,859 psi | 67% | 3022 fps | 98.1% |
| ReloadSwiss RS 60 | 52.7 gr | 80% | 35,607 psi | 55% | 2871 fps | 99.1% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 38,856 psi | 60% | 2910 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,626 psi | 64% | 2992 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 48,472 psi | 75% | 2979 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,424 psi | 65% | 2877 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 35,911 psi | 55% | 2776 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 50,821 psi | 78% | 3051 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 40,393 psi | 62% | 2844 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,976 psi | 69% | 2956 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,596 psi | 62% | 2854 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 46,557 psi | 72% | 2992 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,999 psi | 57% | 2828 fps | 96.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,340 psi | 71% | 2969 fps | 97.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,309 psi | 68% | 2946 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,108 psi | 71% | 2887 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,392 psi | 59% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 45,585 psi | 70% | 2904 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 52,069 psi | 80% | 3081 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,629 psi | 70% | 2884 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,035 psi | 71% | 2966 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 36,637 psi | 56% | 2782 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 28,427 psi | 44% | 2641 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 52,025 psi | 80% | 2956 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 46,528 psi | 72% | 2881 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,163 psi | 65% | 2861 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,873 psi | 66% | 2871 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,012 psi | 54% | 2717 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 38,218 psi | 59% | 2835 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 48,254 psi | 74% | 2995 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 41,278 psi | 64% | 2854 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 37,681 psi | 58% | 2835 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 92% | 33,910 psi | 52% | 2805 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,980 psi | 48% | 2621 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 48,182 psi | 74% | 3045 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 48,037 psi | 74% | 3084 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,662 psi | 49% | 2808 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,888 psi | 68% | 2949 fps | 99% |
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 115 powders for .280 Ackley Improved loaded with the .284 | 120gr | Barnes TSX BT. Alliant Reloder-17 delivers the highest muzzle velocity at 3,323 fps; across all powders the maximum-charge window runs from 1,969 fps to 3,323 fps. Accurate 3100 gives the best case fill at 100 %, and 115 of the 115 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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. Alliant Power Pro 2000-MR, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .280 Ackley Improved with the .284 | 120gr | Barnes TSX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 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.