Load Specifications
Bullet:.284 | 145gr | Barnes LRX BT
Bullet Manufacturer:Barnes
Bullet Weight:145 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:1:9.5
Load data in caliber .280 Ackley Improved with .284 | 145gr | Barnes LRX BT bullet and 107 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 70 and Hodgdon Superformance.
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% | 57,348 psi | 88% | 2792 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,652 psi | 87% | 2818 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 58,189 psi | 90% | 2887 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,274 psi | 85% | 2835 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,732 psi | 73% | 2802 fps | 98.4% |
| Accurate 4064 | <<locked>> | 88% | 56,724 psi | 87% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,667 psi | 89% | 2976 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 52,562 psi | 81% | 2999 fps | 96.1% |
| ADI AR 2206H | <<locked>> | 84% | 56,739 psi | 87% | 2907 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,957 psi | 89% | 2910 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,564 psi | 85% | 2963 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,521 psi | 85% | 2851 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,029 psi | 88% | 2818 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,188 psi | 88% | 3038 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,317 psi | 85% | 2956 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 58,421 psi | 90% | 2933 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,230 psi | 85% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 58,711 psi | 90% | 3035 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,347 psi | 87% | 3012 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,491 psi | 84% | 2946 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,790 psi | 74% | 2877 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,078 psi | 69% | 2825 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,494 psi | 61% | 2730 fps | 97.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,605 psi | 79% | 3018 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,840 psi | 87% | 2927 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 55,361 psi | 85% | 2894 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,790 psi | 74% | 2877 fps | 96.1% |
| Bofors RP7 | <<locked>> | 94% | 58,798 psi | 90% | 2930 fps | 98.8% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,695 psi | 87% | 2828 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,245 psi | 85% | 2881 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,188 psi | 86% | 2913 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 56,637 psi | 87% | 2976 fps | 99% |
| Hodgdon H4350 | <<locked>> | 92% | 56,623 psi | 87% | 2936 fps | 98% |
| Hodgdon H4895 | <<locked>> | 84% | 57,377 psi | 88% | 2917 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,085 psi | 85% | 2904 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,682 psi | 89% | 2956 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,087 psi | 88% | 3018 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,795 psi | 55% | 1781 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 58,566 psi | 90% | 2917 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,885 psi | 89% | 2890 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,305 psi | 88% | 2890 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,927 psi | 88% | 2877 fps | 98.9% |
| IMR 4350 | <<locked>> | 96% | 55,970 psi | 86% | 2907 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,145 psi | 88% | 2907 fps | 98.9% |
| IMR 4831 | <<locked>> | 98% | 58,073 psi | 89% | 2966 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,695 psi | 87% | 2933 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,521 psi | 85% | 2851 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,840 psi | 87% | 2877 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,709 psi | 86% | 2828 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,145 psi | 88% | 2884 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,652 psi | 87% | 2897 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 57,957 psi | 89% | 2940 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,537 psi | 61% | 2644 fps | 96.5% |
| Norma 201 | <<locked>> | 84% | 55,245 psi | 85% | 2848 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,101 psi | 86% | 2848 fps | 100% |
| Norma 203B | <<locked>> | 88% | 58,117 psi | 89% | 2943 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,942 psi | 88% | 2963 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 50,836 psi | 78% | 2969 fps | 98.2% |
| Norma URP | <<locked>> | 96% | 56,492 psi | 87% | 2963 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,201 psi | 85% | 2913 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,390 psi | 85% | 2963 fps | 99.4% |
| Ramshot TAC | <<locked>> | 82% | 55,608 psi | 86% | 2877 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,506 psi | 85% | 2890 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,361 psi | 56% | 1824 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,391 psi | 87% | 2897 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,057 psi | 86% | 2972 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,057 psi | 86% | 3005 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,841 psi | 89% | 3002 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,463 psi | 87% | 3028 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 56,014 psi | 86% | 2825 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,724 psi | 86% | 2844 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,506 psi | 85% | 2890 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,450 psi | 88% | 2933 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,374 psi | 82% | 2927 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 94% | 58,798 psi | 90% | 2930 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,652 psi | 87% | 2897 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,840 psi | 87% | 2877 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,145 psi | 88% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,957 psi | 89% | 2940 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,392 psi | 88% | 2953 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 58,059 psi | 89% | 2910 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 58,740 psi | 90% | 2927 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,579 psi | 87% | 2782 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,087 psi | 88% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,956 psi | 88% | 2858 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,881 psi | 81% | 2923 fps | 97.3% |
| Somchem S335 | <<locked>> | 84% | 55,970 psi | 86% | 2779 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,885 psi | 89% | 2900 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,608 psi | 86% | 2887 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,288 psi | 85% | 2963 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,983 psi | 83% | 2904 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 84% | 57,029 psi | 88% | 2766 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,072 psi | 86% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,637 psi | 87% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,942 psi | 88% | 2861 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,143 psi | 85% | 2904 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,615 psi | 72% | 2766 fps | 96.2% |
| Vihtavuori N530 | <<locked>> | 82% | 55,854 psi | 86% | 2851 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 58,392 psi | 90% | 2871 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,044 psi | 89% | 2963 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,227 psi | 77% | 2904 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,187 psi | 85% | 2877 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,565 psi | 87% | 2900 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,942 psi | 88% | 2982 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,350 psi | 62% | 2858 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,245 psi | 85% | 2887 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,966 psi | 78% | 2844 fps | 96.6% |
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% | 53,693 psi | 83% | 2743 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,383 psi | 71% | 2674 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 54,462 psi | 84% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,310 psi | 70% | 2667 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 35,969 psi | 55% | 2569 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 43,976 psi | 68% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,793 psi | 50% | 2507 fps | 96% |
| Accurate High Country | <<locked>> | 98% | 48,747 psi | 75% | 2930 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 49,879 psi | 77% | 2799 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,337 psi | 65% | 2648 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 45,411 psi | 70% | 2782 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,054 psi | 80% | 2799 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,243 psi | 82% | 2769 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,166 psi | 71% | 2851 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,353 psi | 70% | 2779 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,337 psi | 65% | 2671 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,426 psi | 70% | 2740 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,880 psi | 51% | 2530 fps | 96.2% |
| Alliant Reloder-17 | 49.9 gr | 80% | 36,840 psi | 57% | 2654 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 44,744 psi | 69% | 2772 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,672 psi | 69% | 2815 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,703 psi | 44% | 2434 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 96% | 34,679 psi | 53% | 2608 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,098 psi | 51% | 2615 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,516 psi | 76% | 2808 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 42,221 psi | 65% | 2677 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 44,672 psi | 69% | 2815 fps | 95.2% |
| Bofors RP7 | <<locked>> | 84% | 42,917 psi | 66% | 2654 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,505 psi | 82% | 2782 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,517 psi | 79% | 2825 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,844 psi | 66% | 2684 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 40,379 psi | 62% | 2684 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 84% | 43,685 psi | 67% | 2707 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 50,415 psi | 78% | 2808 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,110 psi | 46% | 2421 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,789 psi | 72% | 2785 fps | 100% |
| Hodgdon Superformance | 56.7 gr | 86% | 42,496 psi | 65% | 2753 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,658 psi | 41% | 1591 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,196 psi | 74% | 2756 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,763 psi | 78% | 2792 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,512 psi | 68% | 2684 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,992 psi | 72% | 2710 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 40,741 psi | 63% | 2631 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,117 psi | 60% | 2575 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 31,850 psi | 49% | 2467 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 46,586 psi | 72% | 2769 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,054 psi | 80% | 2799 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,748 psi | 77% | 2776 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,284 psi | 76% | 2730 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 44,469 psi | 68% | 2680 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,593 psi | 56% | 2526 fps | 95.8% |
| Lovex S070 | <<locked>> | 84% | 39,450 psi | 61% | 2608 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 36,796 psi | 57% | 2585 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 48,733 psi | 75% | 2746 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,211 psi | 76% | 2746 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,759 psi | 69% | 2726 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 46,238 psi | 71% | 2779 fps | 95.2% |
| Norma MRP | <<locked>> | 94% | 41,205 psi | 63% | 2776 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 33,112 psi | 51% | 2513 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 80% | 44,846 psi | 69% | 2746 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 36,854 psi | 57% | 2612 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 51,953 psi | 80% | 2818 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,069 psi | 80% | 2838 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,238 psi | 42% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,163 psi | 66% | 2667 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,878 psi | 75% | 2854 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,233 psi | 60% | 2717 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,663 psi | 50% | 2526 fps | 95.5% |
| ReloadSwiss RS 70 | 52 gr | 82% | 34,679 psi | 53% | 2592 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 52,533 psi | 81% | 2772 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,282 psi | 71% | 2697 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,769 psi | 61% | 2621 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 96% | 50,299 psi | 77% | 2818 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 94% | 43,642 psi | 67% | 2753 fps | 95% |
| Rottweil R 907 | <<locked>> | 84% | 42,917 psi | 66% | 2654 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,593 psi | 56% | 2526 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,748 psi | 77% | 2776 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,469 psi | 68% | 2680 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 39,450 psi | 61% | 2608 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,089 psi | 63% | 2677 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,647 psi | 78% | 2799 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,515 psi | 75% | 2772 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,763 psi | 77% | 2687 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,756 psi | 64% | 2552 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,872 psi | 63% | 2579 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,296 psi | 71% | 2808 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 49,530 psi | 76% | 2687 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,357 psi | 77% | 2789 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,408 psi | 62% | 2625 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 29,544 psi | 45% | 2461 fps | 98% |
| Somchem S385 | <<locked>> | 92% | 41,350 psi | 64% | 2677 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 50,299 psi | 77% | 2674 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,253 psi | 71% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,804 psi | 72% | 2680 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,508 psi | 59% | 2559 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 34,490 psi | 53% | 2516 fps | 96.4% |
| Vihtavuori N165 | <<locked>> | 98% | 43,555 psi | 67% | 2710 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 52,272 psi | 80% | 2799 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,976 psi | 69% | 2671 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,881 psi | 52% | 2513 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 29,167 psi | 45% | 2451 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,924 psi | 52% | 2490 fps | 98.4% |
| Winchester 748 | <<locked>> | 80% | 52,663 psi | 81% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,379 psi | 62% | 2684 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,977 psi | 42% | 2457 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,225 psi | 74% | 2776 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 47,224 psi | 73% | 2779 fps | 95.6% |
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 107 powders for .280 Ackley Improved loaded with the .284 | 145gr | Barnes LRX BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,781 fps to 3,038 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 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 145.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, ADI AR 2209 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. Alliant Reloder-17, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 145gr | Barnes LRX 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.