Load Specifications
Bullet:.284 | 130gr | Barnes X BT
Bullet Manufacturer:Barnes
Bullet Weight:130 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:.280 Ackley Improved load data
Case Length (l3):2.54"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:74 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:11.0
Load data in caliber .280 Ackley Improved with .284 | 130gr | Barnes X 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 ReloadSwiss RS 70, Alliant Reloder-16 and Ramshot Hunter.
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 2495 | <<locked>> | 84% | 56,826 psi | 87% | 2949 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,058 psi | 88% | 2989 fps | 97.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,749 psi | 78% | 2972 fps | 98.1% |
| Accurate 4064 | <<locked>> | 86% | 56,811 psi | 87% | 3002 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,478 psi | 87% | 3091 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 84% | 58,320 psi | 90% | 3068 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,738 psi | 86% | 3012 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,681 psi | 87% | 3110 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,898 psi | 88% | 3012 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 58,334 psi | 90% | 3196 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 56,753 psi | 87% | 3110 fps | 96.8% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 56,753 psi | 87% | 3110 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,637 psi | 87% | 3045 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,072 psi | 88% | 3068 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,304 psi | 87% | 3140 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 57,653 psi | 89% | 3173 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,985 psi | 86% | 3100 fps | 96.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,036 psi | 72% | 2986 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,553 psi | 64% | 2884 fps | 96.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,577 psi | 82% | 3179 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 58,276 psi | 90% | 3084 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 58,001 psi | 89% | 3068 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 57,043 psi | 88% | 3031 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 58,407 psi | 90% | 2992 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,188 psi | 88% | 3048 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 58,305 psi | 90% | 3077 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 58,160 psi | 89% | 3133 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 92% | 58,160 psi | 89% | 3091 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 82% | 55,550 psi | 85% | 3025 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,681 psi | 87% | 3064 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,216 psi | 85% | 3058 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 58,653 psi | 90% | 3173 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 56% | 1893 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,391 psi | 87% | 3025 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,941 psi | 86% | 3009 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 58,755 psi | 90% | 3051 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 58,233 psi | 90% | 3028 fps | 98.4% |
| IMR 4350 | <<locked>> | 96% | 57,392 psi | 88% | 3058 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 92% | 58,392 psi | 90% | 3058 fps | 98.4% |
| IMR 4831 | <<locked>> | 96% | 56,376 psi | 87% | 3074 fps | 99.8% |
| IMR 4895 | <<locked>> | 86% | 58,508 psi | 90% | 3097 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,898 psi | 88% | 3012 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,753 psi | 86% | 2999 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,043 psi | 88% | 2986 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,840 psi | 86% | 2999 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 58,595 psi | 90% | 3058 fps | 99.3% |
| Lovex S070 | <<locked>> | 94% | 56,666 psi | 87% | 3048 fps | 98.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,496 psi | 65% | 2815 fps | 96.2% |
| Norma 201 | <<locked>> | 84% | 57,522 psi | 88% | 3015 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,885 psi | 89% | 3012 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,347 psi | 87% | 3051 fps | 100% |
| Norma 204 | <<locked>> | 96% | 58,044 psi | 89% | 3110 fps | 96.8% |
| Norma MRPᴾ | <<locked>> | 100% | 52,518 psi | 81% | 3123 fps | 97.6% |
| Norma URP | <<locked>> | 96% | 58,276 psi | 90% | 3127 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 86% | 56,695 psi | 87% | 3074 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,681 psi | 87% | 3117 fps | 98.9% |
| Ramshot TAC | <<locked>> | 82% | 57,290 psi | 88% | 3035 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,290 psi | 88% | 3054 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 57% | 1939 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 58,059 psi | 89% | 3054 fps | 98.8% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,624 psi | 89% | 3133 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 57,188 psi | 88% | 3169 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,579 psi | 86% | 3104 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 58,146 psi | 89% | 3192 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 58,813 psi | 90% | 2999 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 58,262 psi | 90% | 3015 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,798 psi | 89% | 3058 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 58,566 psi | 90% | 3077 fps | 95.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,100 psi | 85% | 3084 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 92% | 57,043 psi | 88% | 3031 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 58,595 psi | 90% | 3058 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,753 psi | 86% | 2999 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,840 psi | 86% | 2999 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,666 psi | 87% | 3048 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 58,813 psi | 90% | 3114 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,333 psi | 87% | 3018 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,681 psi | 87% | 3038 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,001 psi | 89% | 2940 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 58,595 psi | 90% | 2936 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 58,784 psi | 90% | 3009 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,578 psi | 84% | 3077 fps | 96.5% |
| Somchem S335 | <<locked>> | 84% | 57,885 psi | 89% | 2940 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,492 psi | 85% | 2999 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,551 psi | 89% | 3051 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,884 psi | 88% | 3127 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,115 psi | 86% | 3064 fps | 97.6% |
| Vihtavuori N133 | <<locked>> | 84% | 58,218 psi | 90% | 2920 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,102 psi | 89% | 2972 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 58,305 psi | 90% | 2986 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,361 psi | 85% | 2972 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,869 psi | 87% | 3061 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 57,638 psi | 89% | 3015 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,565 psi | 87% | 2982 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,057 psi | 86% | 3068 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,823 psi | 81% | 3074 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,652 psi | 87% | 3031 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 58,146 psi | 89% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 58,450 psi | 90% | 3136 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,859 psi | 66% | 3028 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,797 psi | 87% | 3045 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 2495 | <<locked>> | 80% | 50,401 psi | 78% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,224 psi | 73% | 2818 fps | 95.4% |
| Accurate 3100 | <<locked>> | 92% | 39,305 psi | 60% | 2746 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 47,601 psi | 73% | 2858 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,955 psi | 55% | 2690 fps | 96% |
| ADI AR 2206H | <<locked>> | 80% | 51,866 psi | 80% | 2963 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 44,222 psi | 68% | 2805 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 96% | 50,198 psi | 77% | 2992 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,679 psi | 83% | 2963 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,776 psi | 74% | 3012 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 50,082 psi | 77% | 2992 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 50,082 psi | 77% | 2992 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,628 psi | 69% | 2835 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,587 psi | 73% | 2904 fps | 99.3% |
| Alliant Reloder-16 | 47.8 gr | 80% | 34,896 psi | 54% | 2684 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,073 psi | 60% | 2818 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 49,487 psi | 76% | 2982 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 86% | 31,198 psi | 48% | 2605 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 98% | 39,233 psi | 60% | 2825 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 88% | 35,868 psi | 55% | 2789 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,097 psi | 79% | 2966 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 45,107 psi | 69% | 2848 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 45,092 psi | 69% | 2812 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,853 psi | 84% | 2940 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,664 psi | 83% | 2995 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,455 psi | 70% | 2851 fps | 98% |
| Hodgdon H414 | <<locked>> | 84% | 42,438 psi | 65% | 2841 fps | 95% |
| Hodgdon H4350 | <<locked>> | 86% | 48,182 psi | 74% | 2913 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 52,373 psi | 81% | 2972 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,634 psi | 50% | 2585 fps | 96.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,704 psi | 75% | 2949 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 44,483 psi | 68% | 2910 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 42% | 1693 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,835 psi | 77% | 2917 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 52,547 psi | 81% | 2956 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,514 psi | 72% | 2841 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,646 psi | 75% | 2861 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 45,208 psi | 70% | 2838 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 82% | 43,468 psi | 67% | 2782 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 34,563 psi | 53% | 2638 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 48,718 psi | 75% | 2933 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 53,679 psi | 83% | 2963 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,228 psi | 80% | 2943 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,995 psi | 78% | 2887 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 47,021 psi | 72% | 2851 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 39,088 psi | 60% | 2687 fps | 95.5% |
| Lovex S070 | <<locked>> | 84% | 42,119 psi | 65% | 2772 fps | 95.2% |
| Lovex S071 | <<locked>> | 98% | 40,161 psi | 62% | 2766 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 51,126 psi | 79% | 2913 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,372 psi | 79% | 2910 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,992 psi | 72% | 2890 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 51,097 psi | 79% | 2989 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 43,366 psi | 67% | 2936 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 35,563 psi | 55% | 2680 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 46,731 psi | 72% | 2904 fps | 99.4% |
| Ramshot Hunter | 54.5 gr | 86% | 41,524 psi | 64% | 2831 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 53,592 psi | 82% | 2972 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,751 psi | 83% | 2999 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,891 psi | 43% | 1736 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,382 psi | 70% | 2828 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,662 psi | 78% | 3018 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,350 psi | 64% | 2884 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,172 psi | 54% | 2694 fps | 95.2% |
| ReloadSwiss RS 70 | 53.6 gr | 82% | 36,796 psi | 57% | 2749 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 55,521 psi | 85% | 2946 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,791 psi | 75% | 2861 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,699 psi | 66% | 2795 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 98% | 55,201 psi | 85% | 3025 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 96% | 48,660 psi | 75% | 2969 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 45,092 psi | 69% | 2812 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,088 psi | 60% | 2687 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,228 psi | 80% | 2943 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,021 psi | 72% | 2851 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 42,119 psi | 65% | 2772 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,960 psi | 66% | 2835 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,837 psi | 81% | 2959 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,169 psi | 77% | 2927 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,605 psi | 79% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,627 psi | 67% | 2707 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 43,381 psi | 67% | 2736 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 48,196 psi | 74% | 2963 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 51,561 psi | 79% | 2848 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,083 psi | 80% | 2946 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 42,844 psi | 66% | 2792 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 32,227 psi | 50% | 2635 fps | 98% |
| Somchem S385 | <<locked>> | 94% | 46,601 psi | 72% | 2894 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 51,909 psi | 80% | 2831 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,573 psi | 75% | 2831 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,805 psi | 75% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,959 psi | 63% | 2720 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 36,767 psi | 57% | 2677 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 80% | 54,027 psi | 83% | 2956 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,282 psi | 73% | 2835 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,550 psi | 56% | 2684 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 84% | 32,140 psi | 49% | 2635 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,071 psi | 55% | 2644 fps | 98.1% |
| Winchester 748 | <<locked>> | 80% | 54,476 psi | 84% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 42,438 psi | 65% | 2841 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 88% | 29,791 psi | 46% | 2638 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,183 psi | 77% | 2936 fps | 99.9% |
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 100 powders for .280 Ackley Improved loaded with the .284 | 130gr | Barnes X BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,893 fps to 3,196 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, 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, ADI AR 2209, Alliant Power Pro Varmint 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 70, Alliant Reloder-16, Ramshot Hunter rank at the top here: for .280 Ackley Improved with the .284 | 130gr | Barnes X BT 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.