Load Specifications
Bullet:.284 | 150gr | Hornady ELD-X
Bullet Manufacturer:Hornady
Bullet Weight:150 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 | 150gr | Hornady ELD-X 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 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 2495 | <<locked>> | 84% | 56,072 psi | 86% | 2756 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,580 psi | 89% | 2825 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,908 psi | 78% | 2805 fps | 99.1% |
| Accurate 4064 | <<locked>> | 86% | 56,478 psi | 87% | 2812 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,869 psi | 87% | 2913 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,477 psi | 85% | 2835 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,536 psi | 87% | 2841 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 58,102 psi | 89% | 2956 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,667 psi | 89% | 2831 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,970 psi | 86% | 2969 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,276 psi | 88% | 2864 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,725 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,479 psi | 88% | 2966 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,361 psi | 85% | 2946 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,101 psi | 88% | 2943 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,792 psi | 78% | 2887 fps | 97.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,718 psi | 73% | 2825 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,800 psi | 64% | 2740 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,839 psi | 84% | 3018 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,376 psi | 85% | 2854 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,586 psi | 72% | 2808 fps | 96.1% |
| Bofors RP3 | <<locked>> | 88% | 58,160 psi | 89% | 2881 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,792 psi | 78% | 2887 fps | 97.3% |
| Bofors RP7 | <<locked>> | 92% | 57,522 psi | 88% | 2864 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,812 psi | 89% | 2867 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 58,798 psi | 90% | 2900 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 55,622 psi | 86% | 2913 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 90% | 55,724 psi | 86% | 2874 fps | 98.2% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,753 psi | 86% | 2890 fps | 96% |
| Hodgdon H4895 | <<locked>> | 82% | 56,144 psi | 86% | 2848 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,870 psi | 89% | 2890 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,231 psi | 87% | 2881 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,782 psi | 86% | 2949 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,187 psi | 56% | 1755 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,072 psi | 88% | 2844 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,898 psi | 88% | 2825 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,188 psi | 86% | 2825 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,492 psi | 85% | 2808 fps | 99% |
| IMR 4350 | <<locked>> | 96% | 58,378 psi | 90% | 2897 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,796 psi | 86% | 2838 fps | 99% |
| IMR 4831 | <<locked>> | 96% | 57,450 psi | 88% | 2907 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,564 psi | 85% | 2864 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,537 psi | 89% | 2884 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 82% | 57,667 psi | 89% | 2831 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,927 psi | 86% | 2812 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,725 psi | 89% | 2808 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,304 psi | 87% | 2818 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,869 psi | 86% | 2838 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 56,927 psi | 88% | 2874 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,337 psi | 65% | 2657 fps | 97.6% |
| Norma 201 | <<locked>> | 84% | 57,725 psi | 89% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 84% | 58,537 psi | 90% | 2828 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,971 psi | 88% | 2874 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,796 psi | 86% | 2897 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 53,737 psi | 83% | 2969 fps | 99% |
| Norma URP | <<locked>> | 94% | 55,521 psi | 85% | 2897 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 57,740 psi | 89% | 2900 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 58,117 psi | 89% | 2953 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,106 psi | 68% | 2740 fps | 96.1% |
| Ramshot TAC | <<locked>> | 82% | 57,798 psi | 89% | 2861 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 58,131 psi | 89% | 2877 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,854 psi | 57% | 1798 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,998 psi | 85% | 2828 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 58,755 psi | 90% | 2956 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,766 psi | 84% | 2936 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,739 psi | 87% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,463 psi | 85% | 2966 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 58,581 psi | 90% | 2805 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 58,494 psi | 90% | 2831 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 58,378 psi | 90% | 2877 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,188 psi | 86% | 2871 fps | 96.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,507 psi | 87% | 2930 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 92% | 57,522 psi | 88% | 2864 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,869 psi | 86% | 2838 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,927 psi | 86% | 2812 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,304 psi | 87% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,927 psi | 88% | 2874 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,318 psi | 87% | 2887 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,884 psi | 88% | 2844 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,464 psi | 88% | 2861 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 58,697 psi | 90% | 2759 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,869 psi | 86% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,724 psi | 86% | 2792 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,999 psi | 86% | 2927 fps | 98.1% |
| Somchem S335 | <<locked>> | 84% | 58,233 psi | 90% | 2756 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,333 psi | 87% | 2828 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 58,189 psi | 90% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 58,131 psi | 89% | 2864 fps | 96.4% |
| Somchem S365 | <<locked>> | 98% | 58,392 psi | 90% | 2953 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,188 psi | 88% | 2907 fps | 98.9% |
| Vihtavuori N133 | <<locked>> | 82% | 55,811 psi | 86% | 2697 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 58,639 psi | 90% | 2785 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,651 psi | 86% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,101 psi | 86% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,769 psi | 89% | 2894 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,211 psi | 76% | 2766 fps | 97.3% |
| Vihtavuori N530 | <<locked>> | 82% | 58,146 psi | 89% | 2831 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 57,217 psi | 88% | 2802 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,087 psi | 88% | 2900 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,345 psi | 82% | 2900 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,244 psi | 83% | 2956 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,754 psi | 89% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,622 psi | 86% | 2913 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,975 psi | 66% | 2871 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,711 psi | 89% | 2867 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,664 psi | 83% | 2841 fps | 97.5% |
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% | 49,385 psi | 76% | 2664 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,384 psi | 73% | 2661 fps | 97% |
| Accurate 3100 | <<locked>> | 90% | 36,274 psi | 56% | 2530 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 46,775 psi | 72% | 2667 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,215 psi | 54% | 2520 fps | 97.3% |
| ADI AR 2206H | <<locked>> | 80% | 52,069 psi | 80% | 2785 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,251 psi | 68% | 2638 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 44,860 psi | 69% | 2730 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 54,172 psi | 83% | 2782 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,486 psi | 75% | 2844 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,773 psi | 69% | 2667 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,630 psi | 73% | 2730 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,737 psi | 53% | 2533 fps | 97.4% |
| Alliant Reloder-17 | 49.9 gr | 80% | 39,189 psi | 60% | 2661 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,367 psi | 68% | 2720 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,498 psi | 68% | 2769 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,050 psi | 42% | 2343 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 94% | 34,534 psi | 53% | 2562 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,967 psi | 51% | 2569 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,721 psi | 80% | 2799 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 43,613 psi | 67% | 2749 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 44,701 psi | 69% | 2671 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 44,498 psi | 68% | 2769 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 39,566 psi | 61% | 2539 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,983 psi | 83% | 2812 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,353 psi | 70% | 2684 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 37,362 psi | 57% | 2569 fps | 95% |
| Hodgdon H4350 | <<locked>> | 82% | 42,902 psi | 66% | 2644 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 98% | 52,112 psi | 80% | 2831 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 52,663 psi | 81% | 2795 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,242 psi | 50% | 2431 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,124 psi | 76% | 2776 fps | 100% |
| Hodgdon Superformance | 54 gr | 82% | 38,928 psi | 60% | 2635 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 42% | 1568 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,502 psi | 78% | 2746 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,156 psi | 82% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,543 psi | 72% | 2671 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,921 psi | 75% | 2700 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 40,147 psi | 62% | 2575 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,162 psi | 63% | 2575 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 34,011 psi | 52% | 2477 fps | 96.9% |
| IMR 4895 | <<locked>> | 80% | 48,878 psi | 75% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 50,691 psi | 78% | 2772 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 54,172 psi | 83% | 2782 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 52,373 psi | 81% | 2762 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,169 psi | 79% | 2710 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,702 psi | 72% | 2671 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,595 psi | 59% | 2526 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 36,811 psi | 57% | 2503 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 34,867 psi | 54% | 2497 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 51,053 psi | 79% | 2733 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,735 psi | 80% | 2733 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,007 psi | 72% | 2717 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 45,469 psi | 70% | 2720 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 38,130 psi | 59% | 2661 fps | 95% |
| Norma URP | <<locked>> | 80% | 35,215 psi | 54% | 2520 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 47,108 psi | 72% | 2736 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 36,535 psi | 56% | 2559 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 98% | 40,973 psi | 63% | 2674 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 54,085 psi | 83% | 2805 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,346 psi | 84% | 2825 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 42% | 1604 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,252 psi | 70% | 2664 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,445 psi | 79% | 2848 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,684 psi | 64% | 2720 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,954 psi | 54% | 2536 fps | 96.8% |
| ReloadSwiss RS 70 | 50.6 gr | 80% | 34,185 psi | 53% | 2539 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 55,317 psi | 85% | 2759 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 48,559 psi | 75% | 2684 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,148 psi | 65% | 2618 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 49,588 psi | 76% | 2762 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 92% | 43,105 psi | 66% | 2697 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 39,566 psi | 61% | 2539 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,595 psi | 59% | 2526 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,373 psi | 81% | 2762 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,702 psi | 72% | 2671 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,811 psi | 57% | 2503 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,279 psi | 67% | 2674 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,069 psi | 82% | 2785 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,676 psi | 78% | 2759 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,764 psi | 80% | 2664 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,671 psi | 67% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,753 psi | 58% | 2467 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 42,685 psi | 66% | 2694 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 51,692 psi | 80% | 2667 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,649 psi | 81% | 2776 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,641 psi | 66% | 2618 fps | 99.8% |
| Somchem S361 | <<locked>> | 96% | 54,534 psi | 84% | 2812 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 31,778 psi | 49% | 2477 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 41,249 psi | 63% | 2631 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 52,301 psi | 80% | 2651 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,602 psi | 75% | 2651 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,907 psi | 75% | 2664 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,654 psi | 63% | 2552 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,564 psi | 56% | 2520 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 96% | 43,091 psi | 66% | 2657 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 54,476 psi | 84% | 2779 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 47,369 psi | 73% | 2661 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,201 psi | 56% | 2523 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 29,573 psi | 45% | 2418 fps | 95.8% |
| Vihtavuori N560 | <<locked>> | 98% | 50,763 psi | 78% | 2897 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,810 psi | 55% | 2490 fps | 99.1% |
| Winchester 760 | <<locked>> | 80% | 37,362 psi | 57% | 2569 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,180 psi | 42% | 2428 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,546 psi | 78% | 2762 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 43,439 psi | 67% | 2667 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 106 powders for .280 Ackley Improved loaded with the .284 | 150gr | Hornady ELD-X. Alliant Reloder-26 delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,755 fps to 3,018 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 56–90 %, leaving at least 10 % headroom. The 150.0 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 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 150gr | Hornady ELD-X 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.