Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 130gr | CutEdge ESP Raptor bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Hodgdon Superformance.
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% | 58,015 psi | 89% | 2963 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,942 psi | 88% | 2982 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,361 psi | 85% | 3005 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,362 psi | 87% | 2999 fps | 97.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,643 psi | 69% | 2884 fps | 96.8% |
| Accurate 4064 | <<locked>> | 90% | 57,130 psi | 88% | 3038 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,986 psi | 89% | 3136 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 57,537 psi | 89% | 3077 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 58,697 psi | 90% | 3077 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,449 psi | 87% | 3025 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,711 psi | 89% | 2995 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 57,856 psi | 89% | 3209 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,259 psi | 85% | 3045 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,796 psi | 86% | 3068 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,434 psi | 85% | 3143 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,840 psi | 87% | 3176 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,221 psi | 65% | 2910 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,095 psi | 74% | 3097 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,740 psi | 89% | 3094 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 55,898 psi | 86% | 3061 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,840 psi | 86% | 3031 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,943 psi | 89% | 3005 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,014 psi | 86% | 3051 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 58,552 psi | 90% | 3166 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,826 psi | 87% | 3074 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 96% | 56,985 psi | 88% | 3133 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 94% | 57,377 psi | 88% | 3094 fps | 97.2% |
| Hodgdon H4895 | <<locked>> | 86% | 58,146 psi | 89% | 3087 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,448 psi | 85% | 3061 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 58,146 psi | 89% | 3123 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 57,957 psi | 89% | 3176 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,505 psi | 55% | 1886 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,753 psi | 86% | 3035 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 58,392 psi | 90% | 3064 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 58,073 psi | 89% | 3058 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,769 psi | 89% | 3038 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 56,565 psi | 87% | 3061 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,914 psi | 89% | 3068 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 3127 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 57,261 psi | 88% | 3100 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,449 psi | 87% | 3025 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,609 psi | 89% | 3048 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,855 psi | 87% | 3002 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,812 psi | 89% | 3051 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,232 psi | 88% | 3058 fps | 99.2% |
| Lovex S070 | <<locked>> | 98% | 58,595 psi | 90% | 3097 fps | 98.6% |
| Norma 201 | <<locked>> | 86% | 55,854 psi | 86% | 3012 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,710 psi | 87% | 3015 fps | 100% |
| Norma 203B | <<locked>> | 90% | 58,595 psi | 90% | 3107 fps | 100% |
| Norma 204 | <<locked>> | 98% | 57,609 psi | 89% | 3117 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 47,514 psi | 73% | 3045 fps | 96.4% |
| Norma URP | <<locked>> | 98% | 56,913 psi | 88% | 3123 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 55,840 psi | 86% | 3081 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,782 psi | 86% | 3117 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 56,739 psi | 87% | 3045 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,594 psi | 87% | 3061 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,058 psi | 88% | 3022 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,998 psi | 55% | 1929 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 57,334 psi | 88% | 3061 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,637 psi | 87% | 3140 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 56,420 psi | 87% | 3176 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 58,059 psi | 89% | 3163 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 57,450 psi | 88% | 3199 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 84% | 56,681 psi | 87% | 2995 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,623 psi | 87% | 3015 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,072 psi | 86% | 3054 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,840 psi | 86% | 3031 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,232 psi | 88% | 3058 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,609 psi | 89% | 3048 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,812 psi | 89% | 3051 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 58,595 psi | 90% | 3097 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 58,015 psi | 89% | 3117 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,143 psi | 85% | 3018 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,970 psi | 86% | 3045 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,348 psi | 88% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 58,044 psi | 89% | 2949 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,609 psi | 89% | 3009 fps | 98.3% |
| Somchem S321 | <<locked>> | 82% | 57,870 psi | 89% | 3058 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,681 psi | 87% | 2946 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,955 psi | 85% | 3012 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,014 psi | 86% | 3048 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,230 psi | 85% | 3123 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,865 psi | 78% | 2995 fps | 96.6% |
| Vihtavuori N130 | <<locked>> | 82% | 56,942 psi | 88% | 2907 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,711 psi | 89% | 2933 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,637 psi | 87% | 2976 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 57,348 psi | 88% | 2992 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 57,885 psi | 89% | 3028 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,651 psi | 86% | 3064 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 56,811 psi | 87% | 3022 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,622 psi | 86% | 2989 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 58,320 psi | 90% | 3120 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,007 psi | 72% | 2995 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,985 psi | 86% | 3038 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 57,334 psi | 88% | 3074 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 57,246 psi | 88% | 3136 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,942 psi | 58% | 2923 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,188 psi | 86% | 3054 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% | 51,256 psi | 79% | 2864 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,526 psi | 67% | 2779 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,605 psi | 79% | 2953 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,948 psi | 71% | 2815 fps | 95.1% |
| Accurate 3100 | <<locked>> | 98% | 41,394 psi | 64% | 2815 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 41,191 psi | 63% | 2772 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,346 psi | 54% | 2703 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 47,369 psi | 73% | 2904 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 40,306 psi | 62% | 2743 fps | 97.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,545 psi | 76% | 2913 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,415 psi | 78% | 2894 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,540 psi | 67% | 2943 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,045 psi | 62% | 2766 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,975 psi | 66% | 2835 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,259 psi | 54% | 2720 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,693 psi | 53% | 2730 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,516 psi | 47% | 2608 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,708 psi | 55% | 2808 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,876 psi | 72% | 2910 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 39,668 psi | 61% | 2766 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 46,151 psi | 71% | 2858 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,213 psi | 79% | 2900 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,791 psi | 75% | 2933 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 54,302 psi | 84% | 3100 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 40,625 psi | 63% | 2776 fps | 96.9% |
| Hodgdon H414 | <<locked>> | 88% | 43,453 psi | 67% | 2884 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 90% | 50,299 psi | 77% | 2972 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 47,863 psi | 74% | 2917 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,327 psi | 47% | 2549 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,208 psi | 68% | 2887 fps | 99.6% |
| Hodgdon Superformance | 61.1 gr | 90% | 46,354 psi | 71% | 2969 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 41% | 1686 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,079 psi | 71% | 2867 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 48,022 psi | 74% | 2910 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,351 psi | 65% | 2782 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,802 psi | 69% | 2805 fps | 95.7% |
| IMR 4350 | <<locked>> | 92% | 46,862 psi | 72% | 2890 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,194 psi | 70% | 2841 fps | 95.7% |
| IMR 4831 | <<locked>> | 84% | 34,098 psi | 52% | 2654 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 44,048 psi | 68% | 2867 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 49,545 psi | 76% | 2913 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,847 psi | 72% | 2881 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,166 psi | 73% | 2838 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 42,221 psi | 65% | 2782 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 39,204 psi | 60% | 2717 fps | 95.5% |
| Lovex S070 | <<locked>> | 88% | 42,438 psi | 65% | 2805 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 46,122 psi | 71% | 2848 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 46,760 psi | 72% | 2858 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,322 psi | 65% | 2822 fps | 98.8% |
| Norma 204 | <<locked>> | 94% | 50,212 psi | 77% | 2992 fps | 95% |
| Norma MRP | <<locked>> | 98% | 44,237 psi | 68% | 2976 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 35,578 psi | 55% | 2707 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 42,264 psi | 65% | 2838 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 39,813 psi | 61% | 2812 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 49,487 psi | 76% | 2920 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,400 psi | 76% | 2943 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,447 psi | 82% | 2966 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,745 psi | 41% | 1726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,002 psi | 63% | 2759 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,847 psi | 71% | 2953 fps | 99% |
| ReloadSwiss RS 60 | 51.4 gr | 80% | 36,985 psi | 57% | 2805 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,099 psi | 54% | 2720 fps | 95.2% |
| ReloadSwiss RS 70 | 56.1 gr | 86% | 37,478 psi | 58% | 2789 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 50,227 psi | 77% | 2894 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,092 psi | 68% | 2802 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 37,420 psi | 58% | 2710 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 46,151 psi | 71% | 2858 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,204 psi | 60% | 2717 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,847 psi | 72% | 2881 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,221 psi | 65% | 2782 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 42,438 psi | 65% | 2805 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,566 psi | 59% | 2762 fps | 97.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,022 psi | 74% | 2897 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,934 psi | 71% | 2871 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,413 psi | 73% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,595 psi | 61% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,135 psi | 68% | 2776 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 53,809 psi | 83% | 2995 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,021 psi | 72% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,674 psi | 73% | 2890 fps | 99.5% |
| Somchem S355 | <<locked>> | 80% | 38,029 psi | 59% | 2713 fps | 98.3% |
| Somchem S365 | <<locked>> | 80% | 27,630 psi | 43% | 2523 fps | 95.9% |
| Somchem S385 | <<locked>> | 96% | 44,614 psi | 69% | 2877 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 53,447 psi | 82% | 2861 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,892 psi | 74% | 2789 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,642 psi | 67% | 2776 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,382 psi | 68% | 2792 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,361 psi | 56% | 2648 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 34,635 psi | 53% | 2648 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 49,661 psi | 76% | 2907 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,801 psi | 66% | 2776 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,622 psi | 56% | 2710 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 90% | 33,359 psi | 51% | 2697 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,097 psi | 49% | 2566 fps | 96.7% |
| Winchester 748 | <<locked>> | 80% | 49,908 psi | 77% | 2959 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 43,714 psi | 67% | 2887 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,922 psi | 48% | 2707 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,701 psi | 70% | 2877 fps | 99.6% |
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 98 powders for .280 Ackley Improved loaded with the .284 | 130gr | CutEdge ESP Raptor. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,886 fps to 3,209 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 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 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, 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, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 130gr | CutEdge ESP Raptor 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.