Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 120gr | Barnes TTSX BT bullet and 100 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>> | 86% | 58,653 psi | 90% | 3084 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 57,290 psi | 88% | 3117 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 57,421 psi | 88% | 3107 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,854 psi | 86% | 3130 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 57,145 psi | 88% | 3107 fps | 96.7% |
| Accurate 4064 | <<locked>> | 92% | 57,464 psi | 88% | 3156 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 58,131 psi | 89% | 3248 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 58,015 psi | 89% | 3196 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 55,622 psi | 86% | 3136 fps | 99.6% |
| ADI Benchmark 8208 | <<locked>> | 86% | 57,000 psi | 88% | 3143 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 58,073 psi | 89% | 3120 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 58,552 psi | 90% | 3330 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,811 psi | 86% | 3163 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 58,044 psi | 89% | 3091 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 56,376 psi | 87% | 3186 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,477 psi | 85% | 3248 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,985 psi | 88% | 3291 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,552 psi | 61% | 2943 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,469 psi | 68% | 3117 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 58,247 psi | 90% | 3212 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 56,304 psi | 87% | 3176 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,289 psi | 87% | 3140 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 86% | 58,682 psi | 90% | 3127 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,492 psi | 87% | 3169 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,926 psi | 85% | 3219 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 82% | 57,667 psi | 89% | 3140 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,406 psi | 88% | 3192 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 98% | 57,188 psi | 88% | 3241 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 96% | 57,870 psi | 89% | 3202 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 88% | 58,610 psi | 90% | 3205 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,706 psi | 80% | 3114 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 58,566 psi | 90% | 3241 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 58,537 psi | 90% | 3287 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,331 psi | 54% | 1959 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,579 psi | 87% | 3156 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 58,755 psi | 90% | 3189 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 58,610 psi | 90% | 3176 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 58,726 psi | 90% | 3156 fps | 97.8% |
| IMR 4198 | <<locked>> | 82% | 57,856 psi | 89% | 3048 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 57,043 psi | 88% | 3169 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 96% | 58,421 psi | 90% | 3176 fps | 97.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,737 psi | 84% | 3176 fps | 99.3% |
| IMR 4895 | <<locked>> | 90% | 57,841 psi | 89% | 3222 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 57,000 psi | 88% | 3143 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 57,130 psi | 88% | 3127 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 58,088 psi | 89% | 3169 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,580 psi | 89% | 3120 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 58,189 psi | 90% | 3169 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,827 psi | 89% | 3169 fps | 98.7% |
| Lovex S070ᴾ | <<locked>> | 100% | 58,740 psi | 90% | 3205 fps | 98% |
| Norma 201 | <<locked>> | 88% | 56,666 psi | 87% | 3136 fps | 100% |
| Norma 202 | <<locked>> | 88% | 57,130 psi | 88% | 3136 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,550 psi | 85% | 3169 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 56,855 psi | 87% | 3228 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 90% | 56,449 psi | 87% | 3199 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,869 psi | 86% | 3225 fps | 98.2% |
| Ramshot TAC | <<locked>> | 86% | 57,464 psi | 88% | 3159 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,188 psi | 88% | 3179 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,928 psi | 89% | 3143 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,737 psi | 55% | 2005 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,275 psi | 87% | 3120 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,914 psi | 89% | 3173 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,985 psi | 88% | 3258 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,594 psi | 87% | 3294 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,928 psi | 89% | 3268 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,725 psi | 89% | 3304 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 57,276 psi | 88% | 3117 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 57,130 psi | 88% | 3133 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 56,159 psi | 86% | 3166 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 56,289 psi | 87% | 3140 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,827 psi | 89% | 3169 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 88% | 58,088 psi | 89% | 3169 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 58,189 psi | 90% | 3169 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 58,740 psi | 90% | 3205 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 58,349 psi | 90% | 3235 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,753 psi | 86% | 3133 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,608 psi | 87% | 3163 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 58,218 psi | 90% | 3074 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 58,740 psi | 90% | 3068 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 58,334 psi | 90% | 3117 fps | 97.7% |
| Somchem S321 | <<locked>> | 84% | 58,566 psi | 90% | 3179 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,580 psi | 89% | 3071 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,521 psi | 85% | 3127 fps | 99.8% |
| Somchem S355 | <<locked>> | 94% | 56,536 psi | 87% | 3166 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,372 psi | 79% | 3176 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 57,812 psi | 89% | 3035 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 58,465 psi | 90% | 3058 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 57,029 psi | 88% | 3100 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 58,102 psi | 89% | 3117 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 58,189 psi | 90% | 3143 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,985 psi | 86% | 3173 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 86% | 57,725 psi | 89% | 3146 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 56,246 psi | 87% | 3110 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 58,581 psi | 90% | 3232 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,308 psi | 67% | 3025 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,347 psi | 87% | 3150 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,914 psi | 89% | 3196 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,508 psi | 88% | 3245 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,288 psi | 54% | 2927 fps | 97.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,739 psi | 87% | 3176 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% | 48,559 psi | 75% | 2933 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,476 psi | 82% | 3058 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,727 psi | 63% | 2835 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,515 psi | 75% | 3009 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 49,835 psi | 77% | 2982 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 38,522 psi | 59% | 2822 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 37,681 psi | 58% | 2858 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 44,817 psi | 69% | 2956 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,130 psi | 59% | 2789 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,949 psi | 72% | 2972 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 47,326 psi | 73% | 2963 fps | 100% |
| Alliant Power Pro 2000-MR | 52.3 gr | 80% | 40,901 psi | 63% | 2979 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,637 psi | 58% | 2808 fps | 97.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,418 psi | 84% | 3038 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,466 psi | 62% | 2881 fps | 97.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 37,710 psi | 58% | 2874 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,489 psi | 50% | 2756 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 32,605 psi | 50% | 2756 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 38,435 psi | 59% | 2966 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,411 psi | 68% | 2963 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 37,130 psi | 57% | 2808 fps | 97.8% |
| Bofors RP7 | <<locked>> | 92% | 49,516 psi | 76% | 3018 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,762 psi | 75% | 2966 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,890 psi | 71% | 2989 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,923 psi | 78% | 3150 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 80% | 54,027 psi | 83% | 3084 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,174 psi | 59% | 2815 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 92% | 46,804 psi | 72% | 3051 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 94% | 54,056 psi | 83% | 3140 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,223 psi | 70% | 2969 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,430 psi | 50% | 2697 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,394 psi | 64% | 2933 fps | 98.8% |
| Hodgdon Superformance | 64 gr | 94% | 50,488 psi | 78% | 3143 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,092 psi | 40% | 1749 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,598 psi | 67% | 2920 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 45,092 psi | 69% | 2972 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,030 psi | 62% | 2828 fps | 97.2% |
| IMR 4166 Enduron | <<locked>> | 84% | 48,501 psi | 75% | 2976 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 54,505 psi | 84% | 2999 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 50,038 psi | 77% | 3048 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 48,501 psi | 75% | 3002 fps | 95.5% |
| IMR 4831 | <<locked>> | 88% | 36,550 psi | 56% | 2812 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 41,466 psi | 64% | 2913 fps | 98% |
| IMR 8208 XBR | <<locked>> | 80% | 46,949 psi | 72% | 2972 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 53,316 psi | 82% | 3068 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,947 psi | 68% | 2936 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 44,889 psi | 69% | 2894 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 39,813 psi | 61% | 2831 fps | 98.7% |
| Lovex S065 | <<locked>> | 88% | 42,221 psi | 65% | 2881 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 45,571 psi | 70% | 2966 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 43,627 psi | 67% | 2904 fps | 99.3% |
| Norma 202 | <<locked>> | 80% | 44,164 psi | 68% | 2917 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,842 psi | 61% | 2867 fps | 97.6% |
| Norma URP | <<locked>> | 88% | 37,927 psi | 58% | 2858 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 39,566 psi | 61% | 2877 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 92% | 42,511 psi | 65% | 2966 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 47,137 psi | 73% | 2976 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,644 psi | 72% | 2995 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,749 psi | 78% | 3022 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,542 psi | 41% | 1795 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,808 psi | 81% | 3064 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,121 psi | 68% | 2920 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,801 psi | 66% | 2992 fps | 97.7% |
| ReloadSwiss RS 60 | 51.5 gr | 80% | 34,650 psi | 53% | 2838 fps | 98.7% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,637 psi | 58% | 2874 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,596 psi | 62% | 2956 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 47,645 psi | 73% | 2959 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,684 psi | 64% | 2854 fps | 99% |
| Rottweil R 903 | <<locked>> | 80% | 34,983 psi | 54% | 2746 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 92% | 49,516 psi | 76% | 3018 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,221 psi | 65% | 2881 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,947 psi | 68% | 2936 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 39,813 psi | 61% | 2831 fps | 98.7% |
| Shooters World SW4350 | <<locked>> | 92% | 45,571 psi | 70% | 2966 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,114 psi | 56% | 2802 fps | 96.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,252 psi | 70% | 2943 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,395 psi | 67% | 2923 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,063 psi | 69% | 2861 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,449 psi | 58% | 2710 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 47,718 psi | 73% | 2940 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 51,155 psi | 79% | 3061 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,628 psi | 69% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,179 psi | 70% | 2943 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 35,737 psi | 55% | 2753 fps | 96.8% |
| Somchem S365 | <<locked>> | 84% | 29,617 psi | 46% | 2674 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 50,923 psi | 78% | 2933 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,469 psi | 70% | 2858 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,031 psi | 63% | 2838 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,930 psi | 65% | 2848 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,127 psi | 53% | 2690 fps | 97.7% |
| Vihtavuori N160 | <<locked>> | 86% | 37,202 psi | 57% | 2808 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 46,978 psi | 72% | 2966 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 40,364 psi | 62% | 2828 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 39,189 psi | 60% | 2864 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 94% | 35,244 psi | 54% | 2838 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 32,503 psi | 50% | 2657 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 46,920 psi | 72% | 3015 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 46,804 psi | 72% | 3051 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 98% | 32,909 psi | 51% | 2848 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,989 psi | 66% | 2927 fps | 98.8% |
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 | 120gr | Barnes TTSX BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,330 fps; across all powders the maximum-charge window runs from 1,959 fps to 3,330 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 52–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, 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. Alliant Power Pro 2000-MR, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .280 Ackley Improved with the .284 | 120gr | Barnes TTSX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.