Load Specifications
Bullet:.284 | 140gr | Frontier BTSP
Bullet Manufacturer:Frontier Bullets
Bullet Weight:140 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:1:9.0
Load data in caliber .280 Ackley Improved with .284 | 140gr | Frontier BTSP bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Hodgdon Superformance and Alliant Reloder-17.
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>> | 82% | 56,840 psi | 87% | 2825 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,173 psi | 86% | 2854 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,609 psi | 89% | 2920 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 58,363 psi | 90% | 2920 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,152 psi | 73% | 2825 fps | 97.9% |
| Accurate 4064 | <<locked>> | 88% | 56,478 psi | 87% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,695 psi | 87% | 3002 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 56,159 psi | 86% | 2940 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,985 psi | 88% | 2936 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,563 psi | 84% | 2982 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 58,450 psi | 90% | 2936 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,260 psi | 87% | 2854 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,275 psi | 87% | 3068 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,450 psi | 88% | 2963 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,986 psi | 89% | 2986 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,493 psi | 88% | 3061 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,158 psi | 85% | 3038 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,505 psi | 82% | 2966 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,324 psi | 68% | 2851 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,044 psi | 60% | 2749 fps | 96.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,328 psi | 77% | 3035 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,869 psi | 86% | 2953 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 58,610 psi | 90% | 2979 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,943 psi | 89% | 2953 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,405 psi | 87% | 2867 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 58,320 psi | 90% | 2966 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,622 psi | 86% | 2943 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 94% | 55,579 psi | 86% | 2999 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 92% | 55,912 psi | 86% | 2963 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 84% | 56,753 psi | 87% | 2949 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 57,783 psi | 89% | 2982 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,565 psi | 87% | 2982 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,057 psi | 86% | 3038 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,998 psi | 55% | 1811 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,841 psi | 89% | 2949 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,087 psi | 88% | 2927 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,608 psi | 87% | 2923 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,057 psi | 86% | 2900 fps | 98.5% |
| IMR 4350 | <<locked>> | 98% | 58,653 psi | 90% | 2986 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,188 psi | 86% | 2930 fps | 98.5% |
| IMR 4831 | <<locked>> | 98% | 57,377 psi | 88% | 2995 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 55,753 psi | 86% | 2959 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 58,450 psi | 90% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,304 psi | 87% | 2910 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 58,682 psi | 90% | 2913 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,594 psi | 87% | 2917 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,144 psi | 86% | 2930 fps | 99.4% |
| Lovex S070 | <<locked>> | 96% | 57,116 psi | 88% | 2966 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,073 psi | 60% | 2667 fps | 95.8% |
| Norma 201 | <<locked>> | 86% | 58,131 psi | 89% | 2930 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,535 psi | 85% | 2881 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,159 psi | 88% | 2969 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,869 psi | 86% | 2982 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 49,937 psi | 77% | 2989 fps | 97.6% |
| Norma URP | <<locked>> | 96% | 55,492 psi | 85% | 2989 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 88% | 58,131 psi | 89% | 2999 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 58,001 psi | 89% | 3041 fps | 99.4% |
| Ramshot TAC | <<locked>> | 84% | 58,537 psi | 90% | 2959 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 58,740 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,608 psi | 56% | 1854 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,550 psi | 85% | 2923 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,245 psi | 85% | 3002 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 58,697 psi | 90% | 3091 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,768 psi | 87% | 3031 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,405 psi | 85% | 3054 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 82% | 55,767 psi | 86% | 2861 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,274 psi | 85% | 2877 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 58,479 psi | 90% | 2972 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,391 psi | 87% | 2956 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,678 psi | 81% | 2956 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 94% | 57,943 psi | 89% | 2953 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,144 psi | 86% | 2930 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,304 psi | 87% | 2910 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,594 psi | 87% | 2917 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,116 psi | 88% | 2966 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,333 psi | 87% | 2979 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,493 psi | 88% | 2943 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 58,073 psi | 89% | 2963 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,985 psi | 86% | 2815 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,434 psi | 87% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,202 psi | 86% | 2881 fps | 98.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,185 psi | 80% | 2949 fps | 96.6% |
| Somchem S335 | <<locked>> | 86% | 58,755 psi | 90% | 2858 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,927 psi | 88% | 2927 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 58,392 psi | 90% | 2966 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 57,986 psi | 89% | 3045 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,461 psi | 82% | 2933 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 84% | 56,391 psi | 87% | 2799 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,463 psi | 85% | 2841 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,985 psi | 86% | 2858 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,362 psi | 87% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,812 psi | 89% | 2982 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 82% | 55,201 psi | 85% | 2881 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 57,827 psi | 89% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,072 psi | 88% | 2992 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,603 psi | 76% | 2933 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 58,204 psi | 90% | 2959 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,521 psi | 85% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,898 psi | 86% | 3005 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,871 psi | 61% | 2881 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 58,233 psi | 90% | 2969 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% | 53,548 psi | 82% | 2782 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,427 psi | 71% | 2710 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,998 psi | 83% | 2871 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,976 psi | 69% | 2694 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 38,421 psi | 59% | 2654 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 43,918 psi | 68% | 2713 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,677 psi | 50% | 2536 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 49,400 psi | 76% | 2831 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,930 psi | 65% | 2674 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 96% | 47,790 psi | 74% | 2861 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,474 psi | 79% | 2831 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,808 psi | 81% | 2808 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,556 psi | 70% | 2877 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,974 psi | 65% | 2700 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,991 psi | 69% | 2766 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,692 psi | 50% | 2552 fps | 95.5% |
| Alliant Reloder-17 | 49.5 gr | 80% | 36,521 psi | 56% | 2680 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,036 psi | 72% | 2851 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,529 psi | 44% | 2457 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,622 psi | 56% | 2687 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,259 psi | 54% | 2703 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,921 psi | 75% | 2838 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 41,989 psi | 65% | 2707 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 42,641 psi | 66% | 2684 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,953 psi | 81% | 2815 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,024 psi | 78% | 2861 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,554 psi | 65% | 2713 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 84% | 39,958 psi | 61% | 2707 fps | 95% |
| Hodgdon H4350 | <<locked>> | 86% | 46,122 psi | 71% | 2789 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 49,893 psi | 77% | 2838 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,153 psi | 46% | 2451 fps | 96.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,195 psi | 71% | 2815 fps | 99.9% |
| Hodgdon Superformance | 56.3 gr | 86% | 42,134 psi | 65% | 2779 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 41% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,921 psi | 74% | 2792 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,082 psi | 77% | 2825 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,077 psi | 68% | 2710 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,557 psi | 72% | 2736 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 42,830 psi | 66% | 2710 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,365 psi | 64% | 2657 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 31,705 psi | 49% | 2497 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 46,122 psi | 71% | 2799 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,474 psi | 79% | 2831 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,081 psi | 76% | 2805 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,776 psi | 75% | 2759 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 44,164 psi | 68% | 2713 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,463 psi | 56% | 2552 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 41,872 psi | 64% | 2690 fps | 95.8% |
| Lovex S071 | <<locked>> | 98% | 36,680 psi | 56% | 2618 fps | 95% |
| Norma 201 | <<locked>> | 80% | 48,443 psi | 75% | 2779 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,747 psi | 75% | 2779 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,353 psi | 68% | 2756 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 48,892 psi | 75% | 2861 fps | 95.4% |
| Norma MRP | <<locked>> | 96% | 43,424 psi | 67% | 2861 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 32,909 psi | 51% | 2539 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 44,338 psi | 68% | 2772 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 39,015 psi | 60% | 2694 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 51,474 psi | 79% | 2848 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,213 psi | 79% | 2864 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 42% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,830 psi | 66% | 2697 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,993 psi | 74% | 2881 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,870 psi | 60% | 2746 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,751 psi | 53% | 2612 fps | 95.9% |
| ReloadSwiss RS 70 | 52.8 gr | 84% | 36,811 psi | 57% | 2677 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 52,330 psi | 81% | 2808 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,035 psi | 71% | 2726 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,581 psi | 61% | 2654 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 98% | 52,808 psi | 81% | 2897 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 96% | 45,948 psi | 71% | 2835 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 42,641 psi | 66% | 2684 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,463 psi | 56% | 2552 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,081 psi | 76% | 2805 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,164 psi | 68% | 2713 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 41,872 psi | 64% | 2690 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,437 psi | 62% | 2700 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,980 psi | 77% | 2825 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,761 psi | 73% | 2795 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,284 psi | 76% | 2717 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,379 psi | 64% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,669 psi | 63% | 2605 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 48,704 psi | 75% | 2887 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 49,153 psi | 76% | 2720 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,792 psi | 77% | 2818 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,176 psi | 62% | 2654 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 29,602 psi | 46% | 2493 fps | 97.7% |
| Somchem S385 | <<locked>> | 94% | 43,830 psi | 67% | 2762 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 49,748 psi | 77% | 2703 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,832 psi | 71% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,325 psi | 71% | 2713 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,247 psi | 59% | 2589 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 34,258 psi | 53% | 2543 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 51,706 psi | 80% | 2828 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,599 psi | 69% | 2703 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,707 psi | 52% | 2539 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 86% | 31,212 psi | 48% | 2543 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,794 psi | 52% | 2516 fps | 98% |
| Winchester 748 | <<locked>> | 80% | 51,996 psi | 80% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 39,958 psi | 61% | 2707 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,689 psi | 44% | 2543 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,718 psi | 73% | 2805 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 101 powders for .280 Ackley Improved loaded with the .284 | 140gr | Frontier BTSP. ReloadSwiss RS 60 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,811 fps to 3,091 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 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 140.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Frontier BTSP 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.