Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 115gr | CutEdge ESP Raptor bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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>> | 86% | 58,363 psi | 90% | 3150 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,826 psi | 87% | 3173 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 56,840 psi | 87% | 3166 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,564 psi | 85% | 3189 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,652 psi | 87% | 3163 fps | 96.3% |
| Accurate 4064 | <<locked>> | 92% | 57,130 psi | 88% | 3219 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 57,899 psi | 89% | 3307 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 88% | 57,725 psi | 89% | 3258 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 92% | 55,317 psi | 85% | 3196 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,826 psi | 87% | 3209 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 57,667 psi | 89% | 3182 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 58,537 psi | 90% | 3327 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 58,233 psi | 90% | 3389 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,390 psi | 85% | 3219 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 57,696 psi | 89% | 3156 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,999 psi | 86% | 3245 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,100 psi | 85% | 3307 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 96% | 56,724 psi | 87% | 3353 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,233 psi | 60% | 2989 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,280 psi | 68% | 3166 fps | 96.9% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 58,001 psi | 89% | 3271 fps | 99.5% |
| Bofors RP3 | <<locked>> | 92% | 56,159 psi | 86% | 3238 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 56,043 psi | 86% | 3196 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 86% | 58,305 psi | 90% | 3186 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,391 psi | 87% | 3235 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 58,755 psi | 90% | 3350 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 57,392 psi | 88% | 3202 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 58,740 psi | 90% | 3228 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 57,130 psi | 88% | 3251 fps | 99% |
| Hodgdon H414 | <<locked>> | 98% | 56,971 psi | 88% | 3297 fps | 97.4% |
| Hodgdon H4350 | <<locked>> | 96% | 57,508 psi | 88% | 3258 fps | 96% |
| Hodgdon H4895 | <<locked>> | 88% | 58,363 psi | 90% | 3271 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 51,314 psi | 79% | 3169 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 58,276 psi | 90% | 3304 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 58,247 psi | 90% | 3343 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,186 psi | 54% | 2008 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,043 psi | 86% | 3212 fps | 99.9% |
| IMR 3031 | <<locked>> | 88% | 58,262 psi | 90% | 3251 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 58,291 psi | 90% | 3235 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 58,378 psi | 90% | 3212 fps | 97.4% |
| IMR 4198 | <<locked>> | 82% | 57,682 psi | 89% | 3114 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 56,623 psi | 87% | 3222 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 96% | 58,189 psi | 90% | 3235 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 54,592 psi | 84% | 3235 fps | 99.1% |
| IMR 4895 | <<locked>> | 90% | 57,464 psi | 88% | 3281 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 56,826 psi | 87% | 3209 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 56,898 psi | 88% | 3186 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 57,682 psi | 89% | 3228 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 57,174 psi | 88% | 3179 fps | 99.8% |
| Lovex S062 | <<locked>> | 92% | 58,175 psi | 89% | 3232 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 57,522 psi | 88% | 3228 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 58,581 psi | 90% | 3261 fps | 97.7% |
| Norma 201 | <<locked>> | 88% | 56,231 psi | 87% | 3196 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,956 psi | 88% | 3202 fps | 100% |
| Norma 203B | <<locked>> | 92% | 58,711 psi | 90% | 3287 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 56,695 psi | 87% | 3291 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 90% | 56,115 psi | 86% | 3255 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,564 psi | 85% | 3281 fps | 97.9% |
| Ramshot TAC | <<locked>> | 86% | 57,319 psi | 88% | 3222 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 57,043 psi | 88% | 3241 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 57,914 psi | 89% | 3205 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,578 psi | 55% | 2054 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,912 psi | 86% | 3182 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 57,638 psi | 89% | 3232 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 56,579 psi | 87% | 3320 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 56,463 psi | 87% | 3356 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 57,783 psi | 89% | 3327 fps | 99.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 57,508 psi | 88% | 3363 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 86% | 56,724 psi | 87% | 3176 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 56,637 psi | 87% | 3192 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,999 psi | 86% | 3228 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 56,043 psi | 86% | 3196 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 98% | 57,522 psi | 88% | 3228 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 57,682 psi | 89% | 3228 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 58,175 psi | 89% | 3232 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 58,581 psi | 90% | 3261 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 58,001 psi | 89% | 3294 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,593 psi | 86% | 3192 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,275 psi | 87% | 3222 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 57,885 psi | 89% | 3136 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 58,436 psi | 90% | 3130 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 57,928 psi | 89% | 3176 fps | 97.4% |
| Somchem S321 | <<locked>> | 84% | 58,189 psi | 90% | 3241 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 57,145 psi | 88% | 3130 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 55,347 psi | 85% | 3189 fps | 99.7% |
| Somchem S355 | <<locked>> | 94% | 56,072 psi | 86% | 3225 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,894 psi | 78% | 3232 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 57,392 psi | 88% | 3094 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 58,131 psi | 89% | 3120 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,594 psi | 87% | 3159 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 57,798 psi | 89% | 3179 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 57,914 psi | 89% | 3202 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,579 psi | 86% | 3228 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 86% | 57,217 psi | 88% | 3202 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,840 psi | 86% | 3166 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 58,291 psi | 90% | 3291 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,960 psi | 66% | 3074 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,202 psi | 86% | 3205 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 57,522 psi | 88% | 3258 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 57,276 psi | 88% | 3304 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,056 psi | 54% | 2966 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,246 psi | 87% | 3228 fps | 99.9% |
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% | 48,254 psi | 74% | 2992 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 53,084 psi | 82% | 3117 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,582 psi | 62% | 2890 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,167 psi | 74% | 3064 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 52,982 psi | 82% | 3100 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 38,392 psi | 59% | 2877 fps | 99.7% |
| Accurate 4350 | <<locked>> | 88% | 37,463 psi | 58% | 2907 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 44,657 psi | 69% | 3015 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 37,840 psi | 58% | 2841 fps | 95.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,775 psi | 72% | 3028 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 46,920 psi | 72% | 3022 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 54,897 psi | 84% | 3264 fps | 99.9% |
| Alliant Power Pro 2000-MR | 53.7 gr | 80% | 40,756 psi | 63% | 3035 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,507 psi | 58% | 2861 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 54,157 psi | 83% | 3104 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,292 psi | 62% | 2933 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 37,594 psi | 58% | 2927 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 82% | 34,722 psi | 53% | 2874 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 96% | 34,403 psi | 53% | 2861 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 40,988 psi | 63% | 3084 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,990 psi | 68% | 3012 fps | 97.3% |
| Bofors RP3 | <<locked>> | 80% | 36,912 psi | 57% | 2858 fps | 97.4% |
| Bofors RP7 | <<locked>> | 94% | 52,663 psi | 81% | 3136 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,414 psi | 74% | 3022 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,788 psi | 70% | 3048 fps | 99.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,647 psi | 78% | 3209 fps | 99% |
| Hodgdon H322 | <<locked>> | 80% | 53,577 psi | 82% | 3143 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 54,665 psi | 84% | 3166 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 40,727 psi | 63% | 2930 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 94% | 49,617 psi | 76% | 3166 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 94% | 53,795 psi | 83% | 3196 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 45,063 psi | 69% | 3028 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 32,213 psi | 50% | 2743 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,075 psi | 63% | 2986 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 94% | 50,169 psi | 77% | 3196 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,179 psi | 40% | 1798 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,221 psi | 66% | 2972 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 44,701 psi | 69% | 3028 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,726 psi | 61% | 2881 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 84% | 48,182 psi | 74% | 3028 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 54,404 psi | 84% | 3064 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 49,777 psi | 77% | 3100 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 48,254 psi | 74% | 3054 fps | 95.2% |
| IMR 4831 | <<locked>> | 90% | 38,798 psi | 60% | 2920 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 41,292 psi | 64% | 2969 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 80% | 46,775 psi | 72% | 3028 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 52,866 psi | 81% | 3123 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,671 psi | 67% | 2989 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 44,585 psi | 69% | 2949 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 39,494 psi | 61% | 2884 fps | 98.4% |
| Lovex S065 | <<locked>> | 88% | 41,814 psi | 64% | 2927 fps | 95% |
| Lovex S070 | <<locked>> | 94% | 48,370 psi | 74% | 3084 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 43,526 psi | 67% | 2963 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 44,019 psi | 68% | 2979 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,682 psi | 61% | 2920 fps | 97.2% |
| Norma URP | <<locked>> | 88% | 37,768 psi | 58% | 2910 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 39,436 psi | 61% | 2933 fps | 97% |
| Ramshot Hunter | <<locked>> | 94% | 45,281 psi | 70% | 3084 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 46,731 psi | 72% | 3028 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,267 psi | 71% | 3051 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,647 psi | 78% | 3084 fps | 99.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,411 psi | 41% | 1841 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,576 psi | 81% | 3130 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 46,992 psi | 72% | 3038 fps | 95.7% |
| ReloadSwiss RS 52 | 52 gr | 80% | 42,482 psi | 65% | 3048 fps | 97.3% |
| ReloadSwiss RS 60 | 52.8 gr | 80% | 34,418 psi | 53% | 2884 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 40,248 psi | 62% | 2992 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,207 psi | 66% | 3074 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 47,369 psi | 73% | 3018 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,379 psi | 64% | 2907 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 80% | 34,606 psi | 53% | 2792 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 94% | 52,663 psi | 81% | 3136 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,814 psi | 64% | 2927 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,671 psi | 67% | 2989 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 39,494 psi | 61% | 2884 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 94% | 48,370 psi | 74% | 3084 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,882 psi | 55% | 2851 fps | 95.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,889 psi | 69% | 2995 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,134 psi | 66% | 2976 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,846 psi | 69% | 2920 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,246 psi | 57% | 2762 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 47,587 psi | 73% | 2992 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 50,705 psi | 78% | 3117 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 44,585 psi | 69% | 2920 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,773 psi | 69% | 2995 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 35,621 psi | 55% | 2805 fps | 96.5% |
| Somchem S365 | <<locked>> | 84% | 29,370 psi | 45% | 2720 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 50,676 psi | 78% | 2995 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,237 psi | 70% | 2917 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,770 psi | 63% | 2894 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,553 psi | 64% | 2900 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,823 psi | 52% | 2733 fps | 97.3% |
| Vihtavuori N160 | <<locked>> | 88% | 39,537 psi | 61% | 2917 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 46,775 psi | 72% | 3025 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 40,161 psi | 62% | 2884 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 88% | 38,899 psi | 60% | 2913 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 96% | 37,521 psi | 58% | 2949 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 32,343 psi | 50% | 2707 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 46,586 psi | 72% | 3071 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 49,893 psi | 77% | 3173 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 32,750 psi | 50% | 2887 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,685 psi | 66% | 2979 fps | 98.5% |
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 113 powders for .280 Ackley Improved loaded with the .284 | 115gr | CutEdge ESP Raptor. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,389 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,389 fps. Accurate 3100 gives the best case fill at 100 %, and 113 of the 113 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 115.0 gr projectile in 0.284" calls for a 1:12.0 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for .280 Ackley Improved with the .284 | 115gr | CutEdge ESP Raptor 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.