Load Specifications
Bullet Manufacturer:Federal
Bullet Weight:155 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 | 155gr | Federal Terminal Ascent Component bullet and 107 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-16.
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 2495 | <<locked>> | 84% | 55,492 psi | 85% | 2694 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,942 psi | 88% | 2759 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,096 psi | 77% | 2740 fps | 99.1% |
| Accurate 4064 | <<locked>> | 86% | 55,724 psi | 86% | 2746 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,970 psi | 86% | 2848 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 58,349 psi | 90% | 2822 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,927 psi | 86% | 2776 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,363 psi | 88% | 2887 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,174 psi | 88% | 2769 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,187 psi | 85% | 2900 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,666 psi | 87% | 2799 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,072 psi | 88% | 2825 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,956 psi | 88% | 2904 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 58,436 psi | 90% | 2930 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,347 psi | 87% | 2874 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,792 psi | 77% | 2818 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,905 psi | 72% | 2759 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,220 psi | 63% | 2677 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,751 psi | 83% | 2949 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 58,595 psi | 90% | 2844 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 45,803 psi | 70% | 2743 fps | 96% |
| Bofors RP3 | <<locked>> | 88% | 57,711 psi | 89% | 2818 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,792 psi | 77% | 2818 fps | 97.2% |
| Bofors RP7 | <<locked>> | 92% | 56,869 psi | 87% | 2799 fps | 98.9% |
| Hodgdon Benchmark | <<locked>> | 82% | 58,494 psi | 90% | 2746 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,942 psi | 88% | 2799 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 58,059 psi | 89% | 2835 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 58,363 psi | 90% | 2897 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 92% | 58,537 psi | 90% | 2861 fps | 98.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,129 psi | 85% | 2828 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 55,593 psi | 86% | 2782 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,043 psi | 88% | 2825 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,695 psi | 86% | 2818 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,853 psi | 84% | 2881 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,289 psi | 56% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,666 psi | 87% | 2785 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,115 psi | 86% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,448 psi | 85% | 2759 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 58,566 psi | 90% | 2799 fps | 99.4% |
| IMR 4350 | <<locked>> | 96% | 57,754 psi | 89% | 2831 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 92% | 58,798 psi | 90% | 2828 fps | 99.3% |
| IMR 4831 | <<locked>> | 96% | 56,376 psi | 87% | 2838 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 58,566 psi | 90% | 2851 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 56,855 psi | 87% | 2818 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 82% | 57,174 psi | 88% | 2769 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,172 psi | 85% | 2746 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,261 psi | 88% | 2746 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,564 psi | 85% | 2753 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 58,653 psi | 90% | 2822 fps | 99.9% |
| Lovex S070 | <<locked>> | 94% | 56,420 psi | 87% | 2815 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,640 psi | 64% | 2595 fps | 97.6% |
| Norma 201 | <<locked>> | 84% | 57,203 psi | 88% | 2766 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,682 psi | 89% | 2759 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,347 psi | 87% | 2808 fps | 100% |
| Norma 204 | <<locked>> | 96% | 58,784 psi | 90% | 2887 fps | 98.3% |
| Norma MRPᴾ | <<locked>> | 100% | 52,866 psi | 81% | 2900 fps | 98.9% |
| Norma URP | <<locked>> | 96% | 58,494 psi | 90% | 2884 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 57,130 psi | 88% | 2838 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 57,290 psi | 88% | 2887 fps | 99.7% |
| Ramshot TAC | <<locked>> | 82% | 57,406 psi | 88% | 2799 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,334 psi | 88% | 2812 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,738 psi | 57% | 1752 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,928 psi | 89% | 2815 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 58,073 psi | 89% | 2890 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 58,001 psi | 89% | 2923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,811 psi | 86% | 2867 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 58,566 psi | 90% | 2956 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 57,870 psi | 89% | 2736 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,740 psi | 89% | 2766 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,551 psi | 89% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,274 psi | 85% | 2802 fps | 96.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,332 psi | 85% | 2858 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 92% | 56,869 psi | 87% | 2799 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 94% | 58,653 psi | 90% | 2822 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,172 psi | 85% | 2746 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,564 psi | 85% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,420 psi | 87% | 2815 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,666 psi | 86% | 2822 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,086 psi | 86% | 2779 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,898 psi | 88% | 2795 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,073 psi | 89% | 2694 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,463 psi | 85% | 2654 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 58,740 psi | 90% | 2779 fps | 99.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,824 psi | 84% | 2851 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 57,740 psi | 89% | 2694 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,927 psi | 86% | 2766 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,348 psi | 88% | 2805 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 57,363 psi | 88% | 2799 fps | 96.3% |
| Somchem S365 | <<locked>> | 98% | 57,319 psi | 88% | 2881 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,130 psi | 86% | 2838 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 84% | 58,523 psi | 90% | 2674 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,015 psi | 89% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 58,276 psi | 90% | 2740 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,347 psi | 85% | 2733 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,942 psi | 88% | 2825 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,486 psi | 75% | 2703 fps | 97.2% |
| Vihtavuori N530 | <<locked>> | 82% | 57,667 psi | 89% | 2769 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,405 psi | 87% | 2736 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,130 psi | 86% | 2831 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,721 psi | 81% | 2838 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,403 psi | 82% | 2887 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,782 psi | 87% | 2795 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 58,378 psi | 90% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 58,711 psi | 90% | 2904 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,221 psi | 65% | 2805 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,898 psi | 88% | 2802 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,750 psi | 81% | 2779 fps | 97.4% |
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 2495 | <<locked>> | 80% | 48,602 psi | 75% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,775 psi | 72% | 2598 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 35,708 psi | 55% | 2474 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 46,050 psi | 71% | 2605 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,664 psi | 53% | 2464 fps | 97.3% |
| ADI AR 2206H | <<locked>> | 80% | 51,503 psi | 79% | 2720 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,874 psi | 67% | 2579 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 44,135 psi | 68% | 2661 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,548 psi | 82% | 2717 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,848 psi | 74% | 2779 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,121 psi | 68% | 2602 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,036 psi | 72% | 2664 fps | 99.8% |
| Alliant Reloder-16 | 44.5 gr | 80% | 34,185 psi | 53% | 2474 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,580 psi | 59% | 2598 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 43,613 psi | 67% | 2654 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 43,685 psi | 67% | 2703 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,701 psi | 41% | 2290 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,200 psi | 53% | 2510 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,561 psi | 50% | 2513 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,184 psi | 79% | 2736 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 42,844 psi | 66% | 2684 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 44,150 psi | 68% | 2612 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 43,685 psi | 67% | 2703 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 39,233 psi | 60% | 2484 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,868 psi | 84% | 2697 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,345 psi | 82% | 2746 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,628 psi | 69% | 2618 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 36,709 psi | 56% | 2507 fps | 95% |
| Hodgdon H4350 | <<locked>> | 82% | 42,540 psi | 65% | 2589 fps | 95.4% |
| Hodgdon H4831 | <<locked>> | 98% | 51,387 psi | 79% | 2766 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 52,040 psi | 80% | 2730 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,850 psi | 49% | 2375 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,704 psi | 75% | 2713 fps | 100% |
| Hodgdon Superformance | 52 gr | 82% | 38,421 psi | 59% | 2575 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,006 psi | 42% | 1529 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,893 psi | 77% | 2680 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,649 psi | 81% | 2710 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,137 psi | 71% | 2612 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,443 psi | 75% | 2638 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 39,740 psi | 61% | 2520 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,654 psi | 63% | 2516 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 33,475 psi | 51% | 2418 fps | 96.9% |
| IMR 4895 | <<locked>> | 80% | 48,240 psi | 74% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,111 psi | 77% | 2710 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 53,548 psi | 82% | 2717 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,561 psi | 79% | 2697 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,792 psi | 78% | 2651 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,311 psi | 71% | 2612 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,043 psi | 59% | 2464 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 36,303 psi | 56% | 2444 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 34,229 psi | 53% | 2438 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 50,372 psi | 77% | 2667 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,082 psi | 79% | 2667 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,427 psi | 71% | 2654 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 44,889 psi | 69% | 2657 fps | 95.4% |
| Norma MRP | <<locked>> | 90% | 37,521 psi | 58% | 2598 fps | 95% |
| Norma URP | <<locked>> | 80% | 34,693 psi | 53% | 2461 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 46,499 psi | 72% | 2674 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 35,998 psi | 55% | 2500 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 53,563 psi | 82% | 2743 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,751 psi | 83% | 2759 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 42% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,904 psi | 69% | 2605 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,560 psi | 78% | 2779 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,031 psi | 63% | 2654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,360 psi | 53% | 2477 fps | 96.8% |
| ReloadSwiss RS 70 | 48.7 gr | 80% | 33,736 psi | 52% | 2480 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 54,766 psi | 84% | 2697 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,109 psi | 74% | 2625 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,553 psi | 64% | 2559 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 48,863 psi | 75% | 2697 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 92% | 42,525 psi | 65% | 2638 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 39,233 psi | 60% | 2484 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,043 psi | 59% | 2464 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,561 psi | 79% | 2697 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,311 psi | 71% | 2612 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,303 psi | 56% | 2444 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,598 psi | 66% | 2608 fps | 99.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,504 psi | 81% | 2726 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,966 psi | 77% | 2694 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,561 psi | 79% | 2608 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,439 psi | 67% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,260 psi | 57% | 2411 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,119 psi | 65% | 2631 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 50,995 psi | 78% | 2602 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,054 psi | 80% | 2710 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,018 psi | 65% | 2559 fps | 99.8% |
| Somchem S361 | <<locked>> | 96% | 53,751 psi | 83% | 2746 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 31,299 psi | 48% | 2418 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 40,466 psi | 62% | 2569 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 52,069 psi | 80% | 2592 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,283 psi | 74% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,298 psi | 74% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,059 psi | 62% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,056 psi | 55% | 2461 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 42,496 psi | 65% | 2595 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 53,911 psi | 83% | 2717 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,630 psi | 72% | 2595 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,592 psi | 55% | 2461 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 29,109 psi | 45% | 2362 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 98% | 49,937 psi | 77% | 2828 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,418 psi | 54% | 2434 fps | 99.1% |
| Winchester 748 | <<locked>> | 80% | 54,621 psi | 84% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 36,927 psi | 57% | 2510 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,745 psi | 41% | 2372 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,864 psi | 77% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 42,888 psi | 66% | 2608 fps | 95% |
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 120 powders for .280 Ackley Improved loaded with the .284 | 155gr | Federal Terminal Ascent Component. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,956 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,956 fps. Accurate 3100 gives the best case fill at 100 %, and 120 of the 120 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-16 rank at the top here: for .280 Ackley Improved with the .284 | 155gr | Federal Terminal Ascent Component they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2225, Baschieri & Pellagri 109 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.