Load Specifications
Bullet:.284 | 140gr | Barnes TSX BT
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:1:10.5
Load data in caliber .280 Ackley Improved with .284 | 140gr | Barnes TSX 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, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 56,840 psi | 87% | 2838 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,202 psi | 86% | 2867 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,986 psi | 89% | 2936 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 58,581 psi | 90% | 2936 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,355 psi | 73% | 2841 fps | 98.1% |
| Accurate 4064 | <<locked>> | 88% | 56,550 psi | 87% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,435 psi | 88% | 3025 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 56,347 psi | 87% | 2956 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,508 psi | 88% | 2956 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,201 psi | 85% | 3009 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 58,755 psi | 90% | 2953 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,797 psi | 87% | 2871 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 56,782 psi | 87% | 3084 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,885 psi | 89% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 58,378 psi | 90% | 3005 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 58,146 psi | 89% | 3081 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,043 psi | 86% | 3061 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,128 psi | 83% | 2992 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,802 psi | 69% | 2871 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,233 psi | 60% | 2766 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,242 psi | 79% | 3058 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,536 psi | 87% | 2972 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 58,798 psi | 90% | 2995 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 58,421 psi | 90% | 2976 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,492 psi | 87% | 2881 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 58,682 psi | 90% | 2986 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,854 psi | 86% | 2959 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 56,072 psi | 86% | 3018 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 92% | 56,492 psi | 87% | 2986 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 84% | 56,985 psi | 88% | 2963 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 58,363 psi | 90% | 2999 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,029 psi | 88% | 3002 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,884 psi | 88% | 3064 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,969 psi | 55% | 1824 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 58,102 psi | 89% | 2966 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,522 psi | 88% | 2943 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,159 psi | 88% | 2943 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,463 psi | 87% | 2923 fps | 98.7% |
| IMR 4350 | <<locked>> | 96% | 55,767 psi | 86% | 2953 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,840 psi | 87% | 2956 fps | 98.7% |
| IMR 4831 | <<locked>> | 98% | 57,740 psi | 89% | 3015 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,246 psi | 87% | 2979 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 58,755 psi | 90% | 2953 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,333 psi | 87% | 2927 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,463 psi | 85% | 2877 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,000 psi | 88% | 2936 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,289 psi | 87% | 2946 fps | 99.5% |
| Lovex S070 | <<locked>> | 96% | 57,464 psi | 88% | 2982 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,088 psi | 60% | 2680 fps | 96% |
| Norma 201 | <<locked>> | 86% | 58,523 psi | 90% | 2946 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,782 psi | 86% | 2897 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,580 psi | 89% | 2989 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,608 psi | 87% | 3009 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 50,285 psi | 77% | 3005 fps | 97.9% |
| Norma URP | <<locked>> | 96% | 55,970 psi | 86% | 3009 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 58,740 psi | 90% | 3018 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 58,697 psi | 90% | 3064 fps | 99.6% |
| Ramshot TAC | <<locked>> | 82% | 55,376 psi | 85% | 2927 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,274 psi | 85% | 2940 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,289 psi | 56% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,043 psi | 86% | 2943 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,811 psi | 86% | 3022 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,564 psi | 85% | 3054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,377 psi | 88% | 3051 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,304 psi | 87% | 3081 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 55,564 psi | 85% | 2871 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,376 psi | 85% | 2894 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 58,639 psi | 90% | 2989 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,811 psi | 87% | 2976 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,026 psi | 82% | 2972 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 94% | 58,421 psi | 90% | 2976 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,289 psi | 87% | 2946 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,333 psi | 87% | 2927 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,000 psi | 88% | 2936 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,464 psi | 88% | 2982 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,971 psi | 88% | 2999 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,740 psi | 89% | 2959 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 58,465 psi | 90% | 2979 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,057 psi | 86% | 2831 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,971 psi | 88% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,550 psi | 87% | 2900 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,533 psi | 81% | 2966 fps | 96.9% |
| Somchem S335 | <<locked>> | 84% | 55,637 psi | 86% | 2828 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,551 psi | 89% | 2949 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 58,697 psi | 90% | 2982 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 54,955 psi | 85% | 3012 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,882 psi | 83% | 2953 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 84% | 56,550 psi | 87% | 2812 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,782 psi | 86% | 2858 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,188 psi | 86% | 2874 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,608 psi | 87% | 2910 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 58,682 psi | 90% | 3005 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,282 psi | 71% | 2805 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 82% | 55,506 psi | 85% | 2900 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 58,131 psi | 89% | 2920 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 57,435 psi | 88% | 3009 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,893 psi | 77% | 2949 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 58,769 psi | 90% | 2976 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,057 psi | 86% | 2949 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,391 psi | 87% | 3025 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,234 psi | 62% | 2900 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 58,581 psi | 90% | 2986 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,502 psi | 78% | 2884 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% | 53,577 psi | 82% | 2795 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,934 psi | 71% | 2717 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 54,041 psi | 83% | 2884 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,005 psi | 69% | 2710 fps | 95.7% |
| Accurate 3100 | <<locked>> | 94% | 38,435 psi | 59% | 2667 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 43,497 psi | 67% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,547 psi | 50% | 2546 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 49,647 psi | 76% | 2848 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,989 psi | 65% | 2690 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 48,399 psi | 74% | 2887 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,822 psi | 80% | 2851 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,055 psi | 82% | 2825 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,759 psi | 70% | 2894 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,134 psi | 65% | 2713 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,179 psi | 70% | 2782 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,561 psi | 50% | 2562 fps | 95.7% |
| Alliant Reloder-17 | 50.9 gr | 80% | 36,535 psi | 56% | 2694 fps | 98.7% |
| Alliant Reloder-19 | <<locked>> | 96% | 47,572 psi | 73% | 2874 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,456 psi | 44% | 2467 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,782 psi | 57% | 2707 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,215 psi | 54% | 2717 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,356 psi | 76% | 2858 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 41,974 psi | 65% | 2720 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,395 psi | 65% | 2690 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,069 psi | 82% | 2831 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,082 psi | 79% | 2874 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,583 psi | 66% | 2726 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 40,001 psi | 62% | 2720 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 86% | 46,470 psi | 71% | 2808 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 50,198 psi | 77% | 2858 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,965 psi | 46% | 2457 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,427 psi | 71% | 2831 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 42,322 psi | 65% | 2799 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,774 psi | 41% | 1631 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,993 psi | 74% | 2805 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 50,299 psi | 77% | 2838 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,135 psi | 68% | 2723 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,543 psi | 72% | 2749 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 43,062 psi | 66% | 2726 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,553 psi | 64% | 2674 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 31,473 psi | 48% | 2500 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 46,369 psi | 71% | 2815 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,822 psi | 80% | 2851 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,139 psi | 76% | 2818 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,921 psi | 75% | 2776 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,077 psi | 68% | 2723 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 36,245 psi | 56% | 2562 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 39,175 psi | 60% | 2648 fps | 95.1% |
| Lovex S071 | <<locked>> | 98% | 36,666 psi | 56% | 2628 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 48,283 psi | 74% | 2789 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,052 psi | 75% | 2795 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,541 psi | 69% | 2769 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 49,298 psi | 76% | 2884 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 40,770 psi | 63% | 2812 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 32,750 psi | 50% | 2546 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 44,454 psi | 68% | 2785 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 36,680 psi | 56% | 2651 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 51,837 psi | 80% | 2867 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,663 psi | 79% | 2884 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,122 psi | 42% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,873 psi | 66% | 2710 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,254 psi | 74% | 2897 fps | 99.7% |
| ReloadSwiss RS 60 | 50.9 gr | 80% | 38,899 psi | 60% | 2759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,343 psi | 50% | 2562 fps | 95% |
| ReloadSwiss RS 70 | 53 gr | 82% | 34,345 psi | 53% | 2625 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 52,141 psi | 80% | 2822 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,919 psi | 71% | 2740 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,349 psi | 61% | 2657 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 98% | 53,229 psi | 82% | 2917 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 96% | 46,253 psi | 71% | 2854 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 42,395 psi | 65% | 2690 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,245 psi | 56% | 2562 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,139 psi | 76% | 2818 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,077 psi | 68% | 2723 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 39,175 psi | 60% | 2648 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,553 psi | 62% | 2713 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,241 psi | 77% | 2841 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,950 psi | 74% | 2812 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,429 psi | 76% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,466 psi | 64% | 2595 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,553 psi | 62% | 2615 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,803 psi | 70% | 2844 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 49,124 psi | 76% | 2733 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,183 psi | 77% | 2835 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 40,045 psi | 62% | 2664 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 29,341 psi | 45% | 2497 fps | 97.7% |
| Somchem S385 | <<locked>> | 94% | 44,034 psi | 68% | 2776 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 49,951 psi | 77% | 2720 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,876 psi | 71% | 2713 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,340 psi | 71% | 2723 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,116 psi | 59% | 2595 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 34,301 psi | 53% | 2556 fps | 96% |
| Vihtavuori N165 | <<locked>> | 98% | 43,294 psi | 67% | 2749 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 51,996 psi | 80% | 2844 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,715 psi | 69% | 2717 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,649 psi | 52% | 2549 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 86% | 30,995 psi | 48% | 2546 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,808 psi | 52% | 2530 fps | 98.1% |
| Winchester 748 | <<locked>> | 80% | 52,272 psi | 80% | 2894 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,205 psi | 62% | 2723 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,543 psi | 44% | 2552 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,848 psi | 74% | 2818 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,891 psi | 72% | 2822 fps | 95.2% |
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 TSX BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,084 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 1:10.5 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, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Barnes TSX 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.