Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 120gr | Hornady V-MAX bullet and 95 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 Reloder-17 and Hodgdon H414.
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% | 57,638 psi | 89% | 3071 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,898 psi | 88% | 3094 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 58,726 psi | 90% | 3169 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,637 psi | 86% | 3087 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 56,884 psi | 88% | 3146 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,392 psi | 88% | 3235 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 56,768 psi | 87% | 3179 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 57,899 psi | 89% | 3176 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,767 psi | 86% | 3123 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,985 psi | 88% | 3104 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 56,985 psi | 88% | 3307 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 58,378 psi | 90% | 3202 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,201 psi | 85% | 3169 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 58,117 psi | 89% | 3297 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,072 psi | 86% | 3278 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,916 psi | 64% | 2999 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,456 psi | 73% | 3182 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,072 psi | 88% | 3196 fps | 99.6% |
| Bofors RP3 | <<locked>> | 90% | 55,579 psi | 86% | 3166 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,434 psi | 85% | 3127 fps | 96.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,305 psi | 88% | 3110 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,376 psi | 85% | 3153 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 57,566 psi | 89% | 3264 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 90% | 56,376 psi | 87% | 3176 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 96% | 56,231 psi | 87% | 3228 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 94% | 56,594 psi | 87% | 3186 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 86% | 57,348 psi | 88% | 3186 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,491 psi | 84% | 3159 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,435 psi | 88% | 3225 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 57,188 psi | 88% | 3268 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,694 psi | 55% | 1972 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 58,668 psi | 90% | 3192 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 57,624 psi | 89% | 3173 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,435 psi | 88% | 3159 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,130 psi | 88% | 3133 fps | 97.6% |
| IMR 4350 | <<locked>> | 98% | 55,724 psi | 86% | 3153 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,290 psi | 88% | 3163 fps | 97.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 57,624 psi | 89% | 3222 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 56,637 psi | 87% | 3202 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 55,767 psi | 86% | 3123 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,014 psi | 88% | 3153 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,188 psi | 86% | 3100 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 57,290 psi | 88% | 3153 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,724 psi | 87% | 3153 fps | 98.7% |
| Lovex S070 | <<locked>> | 98% | 57,870 psi | 89% | 3192 fps | 98% |
| Norma 201 | <<locked>> | 86% | 55,666 psi | 86% | 3123 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,260 psi | 87% | 3123 fps | 100% |
| Norma 203B | <<locked>> | 90% | 58,131 psi | 89% | 3215 fps | 100% |
| Norma URP | <<locked>> | 98% | 55,985 psi | 86% | 3215 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 88% | 55,143 psi | 85% | 3176 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 58,784 psi | 90% | 3274 fps | 98.7% |
| Ramshot TAC | <<locked>> | 84% | 56,014 psi | 86% | 3140 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,811 psi | 86% | 3159 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,550 psi | 87% | 3123 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 56% | 2018 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 58,552 psi | 90% | 3156 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,420 psi | 87% | 3153 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 55,767 psi | 86% | 3238 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,448 psi | 85% | 3274 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 57,087 psi | 88% | 3255 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,420 psi | 87% | 3284 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 56,260 psi | 87% | 3100 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,072 psi | 86% | 3117 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,405 psi | 85% | 3156 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,434 psi | 85% | 3127 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,724 psi | 87% | 3153 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,014 psi | 88% | 3153 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,290 psi | 88% | 3153 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 57,870 psi | 89% | 3192 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,188 psi | 88% | 3219 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 58,595 psi | 90% | 3179 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,347 psi | 85% | 3146 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,855 psi | 87% | 3058 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,464 psi | 88% | 3054 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,290 psi | 88% | 3107 fps | 97.7% |
| Somchem S321 | <<locked>> | 82% | 57,276 psi | 88% | 3159 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,420 psi | 87% | 3051 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 58,189 psi | 90% | 3169 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 55,695 psi | 86% | 3153 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,302 psi | 84% | 3222 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 56,362 psi | 87% | 3015 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,130 psi | 88% | 3038 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,014 psi | 86% | 3084 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,768 psi | 87% | 3097 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 57,043 psi | 88% | 3127 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 58,697 psi | 90% | 3215 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 56,391 psi | 87% | 3127 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 58,653 psi | 90% | 3146 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,653 psi | 89% | 3219 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,267 psi | 71% | 3084 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,143 psi | 85% | 3130 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,623 psi | 87% | 3179 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,536 psi | 87% | 3232 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,623 psi | 58% | 2999 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,405 psi | 85% | 3153 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% | 50,908 psi | 78% | 2969 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,801 psi | 67% | 2887 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,082 psi | 79% | 3051 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 48,863 psi | 75% | 2966 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 41,408 psi | 64% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 37,594 psi | 58% | 2851 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 47,108 psi | 72% | 3005 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 39,958 psi | 61% | 2835 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,139 psi | 76% | 3012 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 49,719 psi | 76% | 2999 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,192 psi | 66% | 3038 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,900 psi | 61% | 2861 fps | 98.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,714 psi | 66% | 2930 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 37,246 psi | 57% | 2864 fps | 95.7% |
| Alliant Reloder-17 | 52.7 gr | 80% | 34,432 psi | 53% | 2812 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 32,590 psi | 50% | 2756 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 38,130 psi | 59% | 2963 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,456 psi | 71% | 3002 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 39,610 psi | 61% | 2861 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 48,805 psi | 75% | 3009 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,647 psi | 78% | 2999 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,501 psi | 75% | 3035 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 53,519 psi | 82% | 3196 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 80% | 40,422 psi | 62% | 2867 fps | 96% |
| Hodgdon H414 | 58 gr | 90% | 45,919 psi | 71% | 3035 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 92% | 52,997 psi | 82% | 3123 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 47,543 psi | 73% | 3015 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 32,314 psi | 50% | 2694 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,613 psi | 67% | 2979 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 92% | 49,327 psi | 76% | 3123 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,455 psi | 41% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,498 psi | 70% | 2959 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 47,427 psi | 73% | 3012 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,930 psi | 65% | 2874 fps | 97.8% |
| IMR 4166 Enduron | <<locked>> | 82% | 47,268 psi | 73% | 2953 fps | 95.5% |
| IMR 4350 | <<locked>> | 94% | 49,110 psi | 76% | 3031 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 47,471 psi | 73% | 2982 fps | 95.5% |
| IMR 4831 | <<locked>> | 86% | 36,376 psi | 56% | 2805 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 43,801 psi | 67% | 2963 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 49,139 psi | 76% | 3012 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 46,543 psi | 72% | 2979 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,717 psi | 72% | 2933 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 41,974 psi | 65% | 2877 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 41,727 psi | 64% | 2867 fps | 95.5% |
| Lovex S070 | <<locked>> | 90% | 44,918 psi | 69% | 2953 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 46,093 psi | 71% | 2953 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 46,528 psi | 72% | 2963 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,105 psi | 65% | 2917 fps | 98.2% |
| Norma URP | <<locked>> | 86% | 37,826 psi | 58% | 2854 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 41,916 psi | 64% | 2930 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 42,076 psi | 65% | 2956 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 49,110 psi | 76% | 3015 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,791 psi | 75% | 3038 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,084 psi | 82% | 3064 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,977 psi | 42% | 1808 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 55,100 psi | 85% | 3104 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,453 psi | 67% | 2907 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,266 psi | 70% | 3045 fps | 98.3% |
| ReloadSwiss RS 60 | 52.7 gr | 80% | 36,651 psi | 56% | 2890 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 37,362 psi | 57% | 2867 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 39,885 psi | 61% | 2943 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 50,140 psi | 77% | 3002 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,859 psi | 67% | 2900 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 37,217 psi | 57% | 2799 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 48,805 psi | 75% | 3009 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 86% | 41,727 psi | 64% | 2867 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,543 psi | 72% | 2979 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,974 psi | 65% | 2877 fps | 99.1% |
| Shooters World SW4350 | <<locked>> | 90% | 44,918 psi | 69% | 2953 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,203 psi | 59% | 2851 fps | 97.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,529 psi | 73% | 2986 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,527 psi | 70% | 2966 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,079 psi | 72% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,378 psi | 61% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 46,949 psi | 72% | 2927 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 53,403 psi | 82% | 3100 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,934 psi | 72% | 2900 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,297 psi | 73% | 2986 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 38,014 psi | 58% | 2808 fps | 97.7% |
| Somchem S365 | <<locked>> | 82% | 29,544 psi | 45% | 2671 fps | 95.9% |
| Vihtavuori N130 | <<locked>> | 80% | 52,997 psi | 82% | 2966 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,471 psi | 73% | 2890 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,352 psi | 67% | 2877 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,947 psi | 68% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,100 psi | 56% | 2736 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 84% | 36,883 psi | 57% | 2799 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 49,240 psi | 76% | 3009 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 42,540 psi | 65% | 2874 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 38,827 psi | 60% | 2854 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 35,404 psi | 54% | 2841 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,068 psi | 49% | 2648 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 49,240 psi | 76% | 3058 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 46,166 psi | 71% | 3038 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,864 psi | 47% | 2772 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,165 psi | 69% | 2969 fps | 99.2% |
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 95 powders for .280 Ackley Improved loaded with the .284 | 120gr | Hornady V-MAX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,307 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,307 fps. Alliant Reloder-16 gives the best case fill at 100 %, and 95 of the 95 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 120.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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 Reloder-17, Hodgdon H414 rank at the top here: for .280 Ackley Improved with the .284 | 120gr | Hornady V-MAX they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.