Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 130gr | Fox Classic Hunter 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 Reloder-17, ReloadSwiss RS 60 and Winchester 760.
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% | 57,769 psi | 89% | 2956 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,695 psi | 87% | 2979 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,810 psi | 84% | 2999 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 55,985 psi | 86% | 2989 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,266 psi | 68% | 2874 fps | 96.6% |
| Accurate 4064 | <<locked>> | 90% | 56,898 psi | 88% | 3031 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 57,493 psi | 88% | 3127 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 57,043 psi | 88% | 3068 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 58,204 psi | 90% | 3068 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,970 psi | 86% | 3015 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,116 psi | 88% | 2986 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 57,363 psi | 88% | 3199 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 58,697 psi | 90% | 3094 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,303 psi | 85% | 3058 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 58,726 psi | 90% | 3192 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,405 psi | 87% | 3169 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,872 psi | 64% | 2900 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,471 psi | 73% | 3084 fps | 98.8% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,261 psi | 88% | 3084 fps | 99.8% |
| Bofors RP3 | <<locked>> | 90% | 55,724 psi | 86% | 3054 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,448 psi | 85% | 3022 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,421 psi | 88% | 2995 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,492 psi | 85% | 3041 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 58,015 psi | 89% | 3156 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 56,666 psi | 87% | 3071 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 56,565 psi | 87% | 3123 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 56,942 psi | 88% | 3084 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 86% | 57,638 psi | 89% | 3077 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,984 psi | 85% | 3054 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,696 psi | 89% | 3114 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 57,638 psi | 89% | 3169 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,563 psi | 55% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,593 psi | 86% | 3028 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 58,117 psi | 89% | 3061 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 57,885 psi | 89% | 3054 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 57,609 psi | 89% | 3035 fps | 98.3% |
| IMR 4350 | <<locked>> | 98% | 56,173 psi | 86% | 3051 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,508 psi | 88% | 3058 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 58,189 psi | 90% | 3120 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 56,739 psi | 87% | 3091 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,970 psi | 86% | 3015 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,087 psi | 88% | 3041 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,347 psi | 87% | 2992 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,609 psi | 89% | 3048 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 56,797 psi | 87% | 3048 fps | 99.1% |
| Lovex S070 | <<locked>> | 98% | 58,175 psi | 89% | 3091 fps | 98.6% |
| Norma 201 | <<locked>> | 86% | 55,666 psi | 86% | 3009 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,463 psi | 87% | 3012 fps | 100% |
| Norma 203B | <<locked>> | 90% | 58,407 psi | 90% | 3104 fps | 100% |
| Norma 204 | <<locked>> | 98% | 57,203 psi | 88% | 3107 fps | 96.6% |
| Norma MRPᴾ | <<locked>> | 100% | 47,181 psi | 73% | 3035 fps | 96.2% |
| Norma URP | <<locked>> | 98% | 56,449 psi | 87% | 3114 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 55,376 psi | 85% | 3071 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,390 psi | 85% | 3110 fps | 98.7% |
| Ramshot TAC | <<locked>> | 84% | 56,318 psi | 87% | 3035 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,101 psi | 86% | 3051 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 56,927 psi | 88% | 3018 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,056 psi | 55% | 1929 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 56,884 psi | 88% | 3051 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,130 psi | 86% | 3130 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,956 psi | 86% | 3166 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 57,595 psi | 89% | 3153 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,782 psi | 87% | 3186 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 84% | 56,420 psi | 87% | 2989 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,101 psi | 86% | 3005 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,579 psi | 86% | 3045 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 55,448 psi | 85% | 3022 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 56,797 psi | 87% | 3048 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,087 psi | 88% | 3041 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,609 psi | 89% | 3048 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 58,175 psi | 89% | 3091 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,551 psi | 89% | 3110 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 58,624 psi | 90% | 3071 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,535 psi | 85% | 3035 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,101 psi | 88% | 2946 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 57,551 psi | 89% | 2940 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,174 psi | 88% | 2999 fps | 98.2% |
| Somchem S321 | <<locked>> | 82% | 57,392 psi | 88% | 3048 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,478 psi | 87% | 2940 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 58,392 psi | 90% | 3058 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,825 psi | 86% | 3045 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,694 psi | 84% | 3114 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,473 psi | 78% | 2986 fps | 96.5% |
| Vihtavuori N130 | <<locked>> | 82% | 56,681 psi | 87% | 2904 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,493 psi | 88% | 2927 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,101 psi | 86% | 2969 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 57,174 psi | 88% | 2989 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 57,435 psi | 88% | 3022 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,230 psi | 85% | 3054 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 56,608 psi | 87% | 3015 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,143 psi | 85% | 2982 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 57,928 psi | 89% | 3114 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,586 psi | 72% | 2986 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,666 psi | 86% | 3031 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 56,840 psi | 87% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 56,826 psi | 87% | 3127 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,449 psi | 58% | 2907 fps | 99.3% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,724 psi | 86% | 3048 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% | 50,981 psi | 78% | 2858 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,236 psi | 67% | 2772 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,082 psi | 79% | 2940 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,788 psi | 70% | 2808 fps | 95% |
| Accurate 3100 | <<locked>> | 98% | 41,002 psi | 63% | 2808 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 40,930 psi | 63% | 2766 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 34,911 psi | 54% | 2690 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 47,166 psi | 73% | 2897 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 40,118 psi | 62% | 2736 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,298 psi | 76% | 2907 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,082 psi | 77% | 2887 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,337 psi | 67% | 2936 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,798 psi | 61% | 2759 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,743 psi | 66% | 2828 fps | 98.5% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,070 psi | 54% | 2713 fps | 95.7% |
| Alliant Reloder-17 | 51.1 gr | 80% | 34,519 psi | 53% | 2726 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,385 psi | 47% | 2605 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 94% | 38,043 psi | 59% | 2867 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,702 psi | 72% | 2904 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 39,450 psi | 61% | 2759 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 45,992 psi | 71% | 2851 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,734 psi | 78% | 2890 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,544 psi | 75% | 2930 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 54,070 psi | 83% | 3094 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 80% | 40,205 psi | 62% | 2766 fps | 96.7% |
| Hodgdon H414 | <<locked>> | 88% | 43,033 psi | 66% | 2874 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 90% | 50,154 psi | 77% | 2969 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 47,630 psi | 73% | 2910 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,124 psi | 46% | 2543 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,947 psi | 68% | 2881 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 46,021 psi | 71% | 2959 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 41% | 1683 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,629 psi | 70% | 2858 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 47,456 psi | 73% | 2900 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,105 psi | 65% | 2776 fps | 98.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,599 psi | 69% | 2799 fps | 95.6% |
| IMR 4350 | <<locked>> | 92% | 46,456 psi | 71% | 2881 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,788 psi | 69% | 2828 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 33,924 psi | 52% | 2648 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 43,830 psi | 67% | 2861 fps | 99.1% |
| IMR 8208 XBR | <<locked>> | 80% | 49,298 psi | 76% | 2907 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,615 psi | 72% | 2874 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,978 psi | 72% | 2831 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 42,003 psi | 65% | 2779 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 39,015 psi | 60% | 2710 fps | 95.4% |
| Lovex S070 | <<locked>> | 88% | 42,264 psi | 65% | 2802 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 45,890 psi | 71% | 2844 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 46,528 psi | 72% | 2851 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,119 psi | 65% | 2815 fps | 98.7% |
| Norma 204 | <<locked>> | 96% | 53,214 psi | 82% | 3041 fps | 95.7% |
| Norma MRP | <<locked>> | 98% | 43,918 psi | 68% | 2966 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 35,360 psi | 54% | 2700 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 42,061 psi | 65% | 2831 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 39,421 psi | 61% | 2802 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 49,298 psi | 76% | 2913 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,979 psi | 75% | 2933 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,287 psi | 82% | 2963 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,731 psi | 41% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,582 psi | 62% | 2746 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,585 psi | 70% | 2943 fps | 98.9% |
| ReloadSwiss RS 60 | 51.1 gr | 80% | 36,782 psi | 57% | 2795 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 34,911 psi | 54% | 2713 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 37,173 psi | 57% | 2782 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 49,676 psi | 76% | 2884 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,598 psi | 67% | 2792 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 37,188 psi | 57% | 2703 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 45,992 psi | 71% | 2851 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,015 psi | 60% | 2710 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,615 psi | 72% | 2874 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,003 psi | 65% | 2779 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 88% | 42,264 psi | 65% | 2802 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,363 psi | 59% | 2756 fps | 97.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,543 psi | 73% | 2887 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,716 psi | 70% | 2864 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,181 psi | 73% | 2792 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,378 psi | 61% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 44,005 psi | 68% | 2769 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 53,621 psi | 82% | 2989 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,818 psi | 72% | 2792 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,514 psi | 73% | 2884 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 37,782 psi | 58% | 2703 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 27,456 psi | 42% | 2516 fps | 95.7% |
| Somchem S385 | <<locked>> | 98% | 47,282 psi | 73% | 2927 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 53,185 psi | 82% | 2854 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,659 psi | 73% | 2785 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,381 psi | 67% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,179 psi | 68% | 2785 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,158 psi | 56% | 2641 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 34,432 psi | 53% | 2644 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 49,443 psi | 76% | 2904 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,380 psi | 65% | 2766 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 36,216 psi | 56% | 2700 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 90% | 32,996 psi | 51% | 2684 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,952 psi | 49% | 2559 fps | 96.6% |
| Winchester 748 | <<locked>> | 80% | 49,661 psi | 76% | 2953 fps | 100% |
| Winchester 760 | 55 gr | 88% | 43,265 psi | 67% | 2877 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 30,661 psi | 47% | 2694 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,252 psi | 70% | 2867 fps | 99.5% |
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 98 powders for .280 Ackley Improved loaded with the .284 | 130gr | Fox Classic Hunter. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,199 fps; across all powders the maximum-charge window runs from 1,883 fps to 3,199 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 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-16, Alliant Reloder-23 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 Reloder-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .280 Ackley Improved with the .284 | 130gr | Fox Classic Hunter 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.