Load Specifications
Bullet Manufacturer:Barnes
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:1:10.0
Load data in caliber .280 Ackley Improved with .284 | 140gr | Barnes TTSX BT bullet and 103 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.
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% | 55,651 psi | 86% | 2815 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 58,305 psi | 90% | 2887 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,347 psi | 87% | 2907 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,290 psi | 88% | 2907 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,614 psi | 70% | 2802 fps | 97.6% |
| Accurate 4064 | <<locked>> | 90% | 58,566 psi | 90% | 2943 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,579 psi | 86% | 2992 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 58,726 psi | 90% | 2982 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,333 psi | 87% | 2930 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,548 psi | 82% | 2969 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,479 psi | 88% | 2927 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,143 psi | 85% | 2844 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,245 psi | 85% | 3054 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,214 psi | 82% | 2963 fps | 96.7% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,214 psi | 82% | 2963 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,637 psi | 87% | 2953 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,826 psi | 87% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,434 psi | 87% | 3048 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 58,146 psi | 89% | 3084 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,417 psi | 81% | 2953 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,439 psi | 67% | 2838 fps | 99.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,255 psi | 76% | 3018 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 58,740 psi | 90% | 2999 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 57,232 psi | 88% | 2966 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,130 psi | 88% | 2946 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 84% | 58,798 psi | 90% | 2904 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 57,159 psi | 88% | 2956 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 58,117 psi | 89% | 2986 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 58,537 psi | 90% | 3048 fps | 99% |
| Hodgdon H4350 | <<locked>> | 94% | 58,595 psi | 90% | 3009 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 84% | 55,666 psi | 86% | 2936 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,623 psi | 87% | 2969 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,477 psi | 85% | 2969 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,911 psi | 84% | 3025 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,679 psi | 55% | 1808 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,898 psi | 88% | 2940 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,956 psi | 86% | 2913 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,579 psi | 86% | 2913 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,405 psi | 85% | 2894 fps | 98.4% |
| IMR 4350 | <<locked>> | 98% | 57,595 psi | 89% | 2972 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,535 psi | 85% | 2923 fps | 98.4% |
| IMR 4831 | <<locked>> | 98% | 56,057 psi | 86% | 2982 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 58,320 psi | 90% | 3002 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 57,479 psi | 88% | 2927 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 58,798 psi | 90% | 2953 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,783 psi | 89% | 2904 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,405 psi | 85% | 2904 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 58,320 psi | 90% | 2966 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 56,159 psi | 86% | 2956 fps | 98.7% |
| Norma 201 | <<locked>> | 86% | 57,188 psi | 88% | 2920 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,798 psi | 89% | 2917 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,014 psi | 86% | 2959 fps | 100% |
| Norma 204 | <<locked>> | 98% | 58,668 psi | 90% | 3028 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 48,704 psi | 75% | 2969 fps | 97.3% |
| Norma URP | <<locked>> | 98% | 58,059 psi | 89% | 3028 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 57,000 psi | 88% | 2989 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 56,869 psi | 87% | 3028 fps | 99.3% |
| Ramshot TAC | <<locked>> | 84% | 57,812 psi | 89% | 2953 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 57,682 psi | 89% | 2969 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 58,291 psi | 90% | 2930 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 56% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 58,392 psi | 90% | 2969 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 57,899 psi | 89% | 3045 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 57,914 psi | 89% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,448 psi | 85% | 3015 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 58,436 psi | 90% | 3104 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 57,725 psi | 89% | 2897 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,740 psi | 89% | 2920 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 57,101 psi | 88% | 2959 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 55,376 psi | 85% | 2943 fps | 95.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,445 psi | 79% | 2936 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 57,130 psi | 88% | 2946 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 58,320 psi | 90% | 2966 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 58,798 psi | 90% | 2953 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,405 psi | 85% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,159 psi | 86% | 2956 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,521 psi | 85% | 2972 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,318 psi | 87% | 2930 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,000 psi | 88% | 2949 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 58,494 psi | 90% | 2854 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,463 psi | 85% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 58,784 psi | 90% | 2923 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,966 psi | 78% | 2930 fps | 96.4% |
| Somchem S335 | <<locked>> | 86% | 57,972 psi | 89% | 2851 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,144 psi | 86% | 2920 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 57,203 psi | 88% | 2956 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,652 psi | 87% | 3031 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,185 psi | 80% | 2917 fps | 97.5% |
| Vihtavuori N130 | <<locked>> | 82% | 58,102 psi | 89% | 2812 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 55,448 psi | 85% | 2792 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,754 psi | 89% | 2877 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 58,624 psi | 90% | 2897 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,158 psi | 85% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,000 psi | 88% | 2976 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 57,914 psi | 89% | 2923 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,710 psi | 87% | 2894 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,840 psi | 86% | 2979 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,196 psi | 74% | 2913 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,101 psi | 88% | 2946 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 58,465 psi | 90% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 58,537 psi | 90% | 3048 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,856 psi | 60% | 2861 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 57,116 psi | 88% | 2956 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% | 52,359 psi | 81% | 2769 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,715 psi | 69% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,692 psi | 81% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,947 psi | 68% | 2677 fps | 95.2% |
| Accurate 3100 | <<locked>> | 94% | 36,985 psi | 57% | 2628 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 42,337 psi | 65% | 2690 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,750 psi | 52% | 2572 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 48,327 psi | 74% | 2815 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 41,046 psi | 63% | 2661 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 50,038 psi | 77% | 2907 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,502 psi | 78% | 2822 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,677 psi | 80% | 2799 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,570 psi | 69% | 2864 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 46,847 psi | 72% | 2848 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 46,847 psi | 72% | 2848 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,857 psi | 63% | 2684 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,918 psi | 68% | 2753 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,749 psi | 49% | 2533 fps | 95.1% |
| Alliant Reloder-17 | 49.6 gr | 80% | 35,491 psi | 55% | 2661 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,342 psi | 76% | 2897 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,370 psi | 45% | 2490 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,011 psi | 52% | 2674 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,921 psi | 74% | 2825 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 40,683 psi | 63% | 2687 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 44,164 psi | 68% | 2720 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,040 psi | 80% | 2805 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,864 psi | 77% | 2848 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,394 psi | 64% | 2694 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 41,611 psi | 64% | 2746 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 86% | 45,136 psi | 69% | 2772 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 48,834 psi | 75% | 2825 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,124 psi | 45% | 2428 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,150 psi | 69% | 2802 fps | 99.9% |
| Hodgdon Superformance | 57.7 gr | 88% | 44,121 psi | 68% | 2825 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,498 psi | 41% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,992 psi | 72% | 2779 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 48,965 psi | 75% | 2815 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,091 psi | 66% | 2697 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,658 psi | 70% | 2723 fps | 96.6% |
| IMR 4350 | <<locked>> | 90% | 44,672 psi | 69% | 2749 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,207 psi | 66% | 2703 fps | 95.8% |
| IMR 4831 | <<locked>> | 82% | 32,808 psi | 50% | 2533 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 45,020 psi | 69% | 2782 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 80% | 50,502 psi | 78% | 2822 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,051 psi | 74% | 2792 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,892 psi | 74% | 2746 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 43,033 psi | 66% | 2697 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 37,579 psi | 58% | 2585 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 40,712 psi | 63% | 2674 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 47,210 psi | 73% | 2766 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,688 psi | 73% | 2766 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,265 psi | 67% | 2740 fps | 99.3% |
| Norma 204 | <<locked>> | 92% | 47,819 psi | 74% | 2848 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 42,250 psi | 65% | 2838 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 34,156 psi | 53% | 2579 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 43,294 psi | 67% | 2756 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 37,956 psi | 58% | 2677 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 50,488 psi | 78% | 2835 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,473 psi | 78% | 2858 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 54,447 psi | 84% | 2874 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,064 psi | 42% | 1657 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,800 psi | 64% | 2680 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,094 psi | 72% | 2867 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,811 psi | 58% | 2726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,576 psi | 52% | 2589 fps | 95.4% |
| ReloadSwiss RS 70 | 52.9 gr | 84% | 35,752 psi | 55% | 2657 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 50,952 psi | 78% | 2795 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,860 psi | 69% | 2713 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,290 psi | 59% | 2631 fps | 99% |
| Rottweil R 904 | <<locked>> | 98% | 51,764 psi | 80% | 2884 fps | 95% |
| Rottweil R 905 | <<locked>> | 98% | 47,964 psi | 74% | 2877 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 86% | 44,164 psi | 68% | 2720 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,579 psi | 58% | 2585 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,051 psi | 74% | 2792 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,033 psi | 66% | 2697 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 40,712 psi | 63% | 2674 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,624 psi | 61% | 2687 fps | 98.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,066 psi | 75% | 2812 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,021 psi | 72% | 2785 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,341 psi | 74% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,437 psi | 62% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,293 psi | 65% | 2644 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,500 psi | 73% | 2871 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 48,124 psi | 74% | 2710 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,762 psi | 75% | 2805 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 39,044 psi | 60% | 2638 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 28,500 psi | 44% | 2467 fps | 97.2% |
| Somchem S385 | <<locked>> | 94% | 42,598 psi | 66% | 2743 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 54,418 psi | 84% | 2762 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,849 psi | 75% | 2697 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,672 psi | 69% | 2687 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,295 psi | 70% | 2700 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,188 psi | 57% | 2572 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 33,170 psi | 51% | 2523 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 50,691 psi | 78% | 2818 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,540 psi | 67% | 2690 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,925 psi | 54% | 2575 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 88% | 31,923 psi | 49% | 2566 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,822 psi | 50% | 2497 fps | 97.6% |
| Winchester 748 | <<locked>> | 80% | 50,908 psi | 78% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,611 psi | 64% | 2746 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,731 psi | 43% | 2513 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,673 psi | 72% | 2792 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 103 powders for .280 Ackley Improved loaded with the .284 | 140gr | Barnes TTSX BT. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,104 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 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 1:10.0 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 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Barnes TTSX 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.