Load Specifications
Bullet Manufacturer:Frontier Bullets
Bullet Weight:140 gr
Bullet Diameter:0.283"
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:1:10.0
Load data in caliber .280 Ackley Improved with .283 | 140gr | Frontier PH HPBT bullet and 106 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 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 57,653 psi | 89% | 2841 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,595 psi | 89% | 2874 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,811 psi | 86% | 2890 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,370 psi | 74% | 2854 fps | 98.3% |
| Accurate 4064 | <<locked>> | 88% | 57,841 psi | 89% | 2930 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 58,233 psi | 90% | 3031 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 57,072 psi | 88% | 2959 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 58,131 psi | 89% | 2959 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,738 psi | 86% | 3009 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,840 psi | 86% | 2907 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,464 psi | 88% | 2874 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,493 psi | 88% | 3091 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,535 psi | 85% | 3005 fps | 97.3% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,535 psi | 85% | 3005 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 58,668 psi | 90% | 2982 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,564 psi | 85% | 2956 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,245 psi | 85% | 3031 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,536 psi | 87% | 3061 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,708 psi | 84% | 2995 fps | 97.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,385 psi | 74% | 2930 fps | 95.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,469 psi | 70% | 2877 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,958 psi | 61% | 2779 fps | 96.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,083 psi | 80% | 3068 fps | 99.8% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,276 psi | 88% | 2979 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,057 psi | 86% | 2949 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,385 psi | 74% | 2930 fps | 95.9% |
| Bofors RP7 | <<locked>> | 92% | 55,651 psi | 86% | 2927 fps | 98.1% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,043 psi | 88% | 2881 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,637 psi | 86% | 2933 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,753 psi | 87% | 2966 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 56,942 psi | 88% | 3025 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 92% | 56,927 psi | 88% | 2986 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 84% | 57,711 psi | 89% | 2969 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,419 psi | 85% | 2953 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,783 psi | 89% | 3005 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,493 psi | 88% | 3068 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,042 psi | 55% | 1821 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 58,740 psi | 90% | 2969 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,276 psi | 90% | 2946 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,856 psi | 89% | 2946 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,130 psi | 88% | 2927 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 56,246 psi | 87% | 2956 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,479 psi | 88% | 2956 fps | 98.7% |
| IMR 4831 | <<locked>> | 98% | 58,407 psi | 90% | 3018 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 57,029 psi | 88% | 2986 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,840 psi | 86% | 2907 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,305 psi | 88% | 2930 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,028 psi | 86% | 2881 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,870 psi | 89% | 2940 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,203 psi | 88% | 2953 fps | 99.5% |
| Lovex S070 | <<locked>> | 96% | 58,407 psi | 90% | 2992 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,306 psi | 62% | 2697 fps | 96.4% |
| Norma 201 | <<locked>> | 84% | 55,782 psi | 86% | 2900 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,507 psi | 87% | 2900 fps | 100% |
| Norma 203B | <<locked>> | 88% | 58,407 psi | 90% | 2992 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,130 psi | 88% | 3009 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 51,329 psi | 79% | 3018 fps | 98% |
| Norma URP | <<locked>> | 96% | 56,884 psi | 88% | 3012 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 55,622 psi | 86% | 2969 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,637 psi | 86% | 3012 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 56,086 psi | 86% | 2930 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,028 psi | 86% | 2946 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,651 psi | 56% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,550 psi | 87% | 2946 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,608 psi | 87% | 3028 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,333 psi | 87% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 58,117 psi | 89% | 3054 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,913 psi | 88% | 3084 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 56,565 psi | 87% | 2877 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,289 psi | 87% | 2900 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,941 psi | 86% | 2943 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,653 psi | 89% | 2982 fps | 96.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,925 psi | 83% | 2982 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 55,651 psi | 86% | 2927 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,203 psi | 88% | 2953 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,305 psi | 88% | 2930 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,870 psi | 89% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 58,407 psi | 90% | 2992 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,783 psi | 89% | 3005 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 58,610 psi | 90% | 2966 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,695 psi | 86% | 2933 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,000 psi | 88% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,595 psi | 89% | 2835 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,174 psi | 88% | 2900 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,432 psi | 82% | 2976 fps | 97% |
| Somchem S335 | <<locked>> | 84% | 56,405 psi | 87% | 2831 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 58,349 psi | 90% | 2953 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,941 psi | 86% | 2936 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,608 psi | 86% | 3015 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,621 psi | 84% | 2959 fps | 98% |
| Vihtavuori N133 | <<locked>> | 84% | 57,421 psi | 88% | 2818 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,579 psi | 87% | 2861 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,884 psi | 88% | 2874 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,450 psi | 88% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,535 psi | 85% | 2953 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,963 psi | 72% | 2812 fps | 96% |
| Vihtavuori N530 | <<locked>> | 82% | 56,217 psi | 86% | 2904 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,114 psi | 85% | 2874 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,363 psi | 90% | 3015 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,053 psi | 79% | 2963 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,376 psi | 85% | 2927 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,826 psi | 87% | 2953 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,232 psi | 88% | 3031 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,002 psi | 63% | 2913 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,767 psi | 86% | 2940 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,155 psi | 79% | 2890 fps | 96.2% |
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% | 54,346 psi | 84% | 2799 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,268 psi | 73% | 2730 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,759 psi | 70% | 2717 fps | 95.9% |
| Accurate 3100 | <<locked>> | 92% | 36,767 psi | 57% | 2621 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 44,759 psi | 69% | 2730 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,591 psi | 52% | 2566 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 50,372 psi | 77% | 2851 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 42,815 psi | 66% | 2700 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 96% | 48,921 psi | 75% | 2890 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,475 psi | 81% | 2854 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,766 psi | 83% | 2825 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,470 psi | 71% | 2900 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 48,791 psi | 75% | 2887 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 48,791 psi | 75% | 2887 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,888 psi | 66% | 2723 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,963 psi | 71% | 2792 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,257 psi | 51% | 2572 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,304 psi | 57% | 2703 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 48,138 psi | 74% | 2881 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,353 psi | 70% | 2871 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,327 psi | 45% | 2487 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 98% | 37,507 psi | 58% | 2720 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,765 psi | 52% | 2667 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,053 psi | 77% | 2864 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 42,960 psi | 66% | 2730 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 45,353 psi | 70% | 2871 fps | 95% |
| Bofors RP7 | <<locked>> | 84% | 43,424 psi | 67% | 2707 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,940 psi | 83% | 2835 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,953 psi | 80% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,424 psi | 67% | 2733 fps | 98.2% |
| Hodgdon H414 | 51.9 gr | 84% | 40,770 psi | 63% | 2730 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 86% | 47,166 psi | 73% | 2815 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 50,908 psi | 78% | 2861 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,748 psi | 47% | 2474 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,181 psi | 73% | 2838 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 42,960 psi | 66% | 2802 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,818 psi | 41% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,588 psi | 75% | 2808 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,300 psi | 79% | 2848 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,020 psi | 69% | 2733 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,384 psi | 73% | 2759 fps | 97.1% |
| IMR 4350 | <<locked>> | 88% | 43,787 psi | 67% | 2733 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 42,148 psi | 65% | 2680 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 32,532 psi | 50% | 2523 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 47,123 psi | 72% | 2822 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,475 psi | 81% | 2854 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,372 psi | 77% | 2828 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,734 psi | 77% | 2782 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,136 psi | 69% | 2733 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,057 psi | 57% | 2572 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 40,263 psi | 62% | 2664 fps | 95.4% |
| Lovex S071 | <<locked>> | 98% | 37,652 psi | 58% | 2641 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 49,168 psi | 76% | 2795 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,777 psi | 77% | 2799 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,324 psi | 70% | 2779 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 46,673 psi | 72% | 2828 fps | 95% |
| Norma MRP | <<locked>> | 94% | 41,684 psi | 64% | 2825 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 33,736 psi | 52% | 2566 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 45,179 psi | 70% | 2795 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 37,478 psi | 58% | 2664 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 52,518 psi | 81% | 2871 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,373 psi | 81% | 2887 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,427 psi | 42% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,627 psi | 67% | 2717 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,284 psi | 76% | 2907 fps | 99.7% |
| ReloadSwiss RS 60 | 50.5 gr | 80% | 39,682 psi | 61% | 2769 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,272 psi | 51% | 2579 fps | 95.4% |
| ReloadSwiss RS 70 | 52.6 gr | 82% | 35,143 psi | 54% | 2641 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 53,388 psi | 82% | 2831 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,021 psi | 72% | 2753 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,538 psi | 62% | 2677 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 98% | 54,027 psi | 83% | 2923 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 96% | 47,166 psi | 73% | 2864 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 84% | 43,424 psi | 67% | 2707 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,057 psi | 57% | 2572 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,372 psi | 77% | 2828 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,136 psi | 69% | 2733 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,263 psi | 62% | 2664 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,553 psi | 64% | 2730 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,111 psi | 79% | 2848 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,921 psi | 75% | 2822 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,328 psi | 77% | 2740 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,308 psi | 65% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 41,408 psi | 64% | 2625 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,717 psi | 72% | 2858 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 49,864 psi | 77% | 2736 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,908 psi | 78% | 2841 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,886 psi | 63% | 2674 fps | 99.3% |
| Somchem S365 | <<locked>> | 80% | 30,182 psi | 46% | 2513 fps | 98% |
| Somchem S385 | <<locked>> | 92% | 41,959 psi | 65% | 2730 fps | 95% |
| Vihtavuori N133 | <<locked>> | 80% | 50,792 psi | 78% | 2726 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,963 psi | 72% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,297 psi | 73% | 2733 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,131 psi | 60% | 2612 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 35,056 psi | 54% | 2566 fps | 96.3% |
| Vihtavuori N165 | <<locked>> | 98% | 43,961 psi | 68% | 2756 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 52,692 psi | 81% | 2848 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,469 psi | 70% | 2720 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,519 psi | 53% | 2562 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 84% | 29,907 psi | 46% | 2507 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,563 psi | 53% | 2539 fps | 98.3% |
| Winchester 748 | <<locked>> | 80% | 52,968 psi | 81% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,988 psi | 63% | 2733 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,572 psi | 42% | 2507 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,588 psi | 75% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,834 psi | 74% | 2831 fps | 95.4% |
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 106 powders for .280 Ackley Improved loaded with the .283 | 140gr | Frontier PH HPBT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,091 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 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 0.283" calls for a 1:10.0 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 60, ReloadSwiss RS 70, Hodgdon H414 rank at the top here: for .280 Ackley Improved with the .283 | 140gr | Frontier PH HPBT 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.