Load Specifications
Bullet Manufacturer:Berger
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:1:11.0
Load data in caliber .280 Ackley Improved with .284 | 150gr | Berger Classic Hybrid Hunter bullet and 104 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-16 and Alliant Reloder-26.
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% | 57,928 psi | 89% | 2789 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,622 psi | 86% | 2808 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,924 psi | 81% | 2844 fps | 99.4% |
| Accurate 4064 | <<locked>> | 86% | 58,233 psi | 90% | 2841 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,216 psi | 85% | 2897 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 57,116 psi | 88% | 2871 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,262 psi | 90% | 2877 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,304 psi | 87% | 2943 fps | 98.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,940 psi | 83% | 2930 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,885 psi | 89% | 3005 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,593 psi | 86% | 2851 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,738 psi | 86% | 2871 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,144 psi | 86% | 2956 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,450 psi | 88% | 2982 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,477 psi | 85% | 2927 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,663 psi | 81% | 2927 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,734 psi | 77% | 2864 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,366 psi | 67% | 2785 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,246 psi | 88% | 3061 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,043 psi | 88% | 2890 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,399 psi | 74% | 2851 fps | 96.8% |
| Bofors RP3 | <<locked>> | 86% | 56,376 psi | 87% | 2864 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,663 psi | 81% | 2927 fps | 97.8% |
| Bofors RP7 | <<locked>> | 90% | 55,869 psi | 86% | 2851 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 86% | 56,855 psi | 87% | 2884 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 57,551 psi | 89% | 2953 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 90% | 57,319 psi | 88% | 2910 fps | 98.6% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,856 psi | 89% | 2936 fps | 96.7% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,623 psi | 87% | 2917 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 82% | 57,740 psi | 89% | 2881 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,449 psi | 87% | 2881 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,102 psi | 89% | 2917 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 58,146 psi | 89% | 2995 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 56% | 1772 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,114 psi | 85% | 2828 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 58,537 psi | 90% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,725 psi | 89% | 2858 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,855 psi | 87% | 2841 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 56,855 psi | 87% | 2884 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,609 psi | 89% | 2881 fps | 99.3% |
| IMR 4831 | <<locked>> | 94% | 55,738 psi | 86% | 2890 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,159 psi | 88% | 2897 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,782 psi | 86% | 2867 fps | 96.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,343 psi | 79% | 2900 fps | 96% |
| Lovex D073.6 | <<locked>> | 82% | 57,580 psi | 89% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,753 psi | 86% | 2792 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,870 psi | 89% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,479 psi | 88% | 2874 fps | 99.9% |
| Lovex S070 | <<locked>> | 94% | 58,755 psi | 90% | 2913 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,077 psi | 68% | 2697 fps | 98.2% |
| Norma 201 | <<locked>> | 82% | 55,811 psi | 86% | 2812 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,579 psi | 87% | 2812 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,027 psi | 85% | 2854 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,522 psi | 88% | 2933 fps | 98.2% |
| Norma MRPᴾ | <<locked>> | 100% | 56,043 psi | 86% | 3015 fps | 99.3% |
| Norma URP | <<locked>> | 94% | 57,508 psi | 88% | 2936 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,912 psi | 86% | 2884 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,692 psi | 80% | 2917 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 94% | 56,275 psi | 87% | 2936 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,890 psi | 71% | 2785 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 57% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,855 psi | 87% | 2867 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,739 psi | 87% | 2936 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,927 psi | 88% | 2972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,027 psi | 85% | 2920 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,479 psi | 88% | 3005 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,293 psi | 65% | 2799 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,550 psi | 87% | 2815 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,521 psi | 87% | 2861 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 58,131 psi | 89% | 2910 fps | 97.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 58,595 psi | 90% | 2972 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 90% | 55,869 psi | 86% | 2851 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,479 psi | 88% | 2874 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,580 psi | 89% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,870 psi | 89% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 58,755 psi | 90% | 2913 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,015 psi | 89% | 2920 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 58,610 psi | 90% | 2881 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,463 psi | 85% | 2841 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,710 psi | 87% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,682 psi | 89% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,493 psi | 88% | 2828 fps | 99.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,073 psi | 89% | 2969 fps | 98.6% |
| Somchem S335 | <<locked>> | 82% | 56,275 psi | 87% | 2740 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,088 psi | 89% | 2861 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,376 psi | 87% | 2858 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,159 psi | 86% | 2848 fps | 96.3% |
| Somchem S365 | <<locked>> | 96% | 57,000 psi | 88% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,550 psi | 85% | 2890 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 82% | 57,246 psi | 88% | 2726 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,739 psi | 87% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,203 psi | 88% | 2789 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,769 psi | 89% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,072 psi | 86% | 2877 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,024 psi | 78% | 2805 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 55,390 psi | 85% | 2789 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,361 psi | 85% | 2887 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,622 psi | 86% | 2940 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,376 psi | 87% | 3002 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,753 psi | 86% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,812 psi | 89% | 2956 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,860 psi | 69% | 2917 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,579 psi | 86% | 2848 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,521 psi | 85% | 2881 fps | 98% |
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% | 50,908 psi | 78% | 2694 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,689 psi | 75% | 2694 fps | 97.5% |
| Accurate 3100 | <<locked>> | 88% | 35,288 psi | 54% | 2513 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 48,240 psi | 74% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,724 psi | 56% | 2562 fps | 97.9% |
| ADI AR 2206H | <<locked>> | 80% | 53,722 psi | 83% | 2822 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,498 psi | 70% | 2671 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,381 psi | 67% | 2710 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 98% | 50,531 psi | 78% | 2871 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,299 psi | 77% | 2887 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,108 psi | 71% | 2697 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,211 psi | 76% | 2766 fps | 99.9% |
| Alliant Reloder-16 | 47.8 gr | 80% | 35,853 psi | 55% | 2569 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,567 psi | 62% | 2697 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,975 psi | 66% | 2700 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,178 psi | 66% | 2753 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,252 psi | 40% | 2323 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,649 psi | 52% | 2549 fps | 95.5% |
| Alliant Reloder-26 | 55.4 gr | 84% | 32,097 psi | 49% | 2552 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,461 psi | 82% | 2835 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 42,583 psi | 66% | 2740 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 46,325 psi | 71% | 2710 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,178 psi | 66% | 2753 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 40,915 psi | 63% | 2579 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 46,586 psi | 72% | 2713 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 38,740 psi | 60% | 2608 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 80% | 41,582 psi | 64% | 2628 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 96% | 50,488 psi | 78% | 2818 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,026 psi | 82% | 2858 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 54,302 psi | 84% | 2828 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,417 psi | 51% | 2467 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,010 psi | 78% | 2812 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,422 psi | 62% | 2677 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,093 psi | 42% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,822 psi | 80% | 2776 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,839 psi | 84% | 2805 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,863 psi | 74% | 2703 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,314 psi | 77% | 2736 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 38,856 psi | 60% | 2556 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,279 psi | 65% | 2612 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 35,360 psi | 54% | 2516 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 50,488 psi | 78% | 2795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,385 psi | 76% | 2762 fps | 95% |
| IMR 7828 SSC | <<locked>> | 98% | 48,124 psi | 74% | 2841 fps | 95.1% |
| Lovex D073.6 | <<locked>> | 80% | 54,070 psi | 83% | 2795 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,489 psi | 81% | 2743 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,066 psi | 74% | 2703 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,769 psi | 61% | 2559 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 37,942 psi | 58% | 2536 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 34,142 psi | 53% | 2487 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 52,446 psi | 81% | 2762 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,156 psi | 82% | 2762 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,588 psi | 75% | 2753 fps | 100% |
| Norma 204 | <<locked>> | 86% | 44,019 psi | 68% | 2703 fps | 95.3% |
| Norma MRP | <<locked>> | 90% | 39,624 psi | 61% | 2707 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 36,463 psi | 56% | 2556 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 48,863 psi | 75% | 2776 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 48,051 psi | 74% | 2848 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 35,462 psi | 55% | 2539 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 96% | 39,900 psi | 61% | 2664 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,746 psi | 43% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,862 psi | 72% | 2703 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,200 psi | 82% | 2884 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,120 psi | 66% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,347 psi | 56% | 2575 fps | 97.5% |
| ReloadSwiss RS 70 | 52.3 gr | 80% | 35,476 psi | 55% | 2582 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,479 psi | 61% | 2733 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 49,951 psi | 77% | 2717 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,511 psi | 67% | 2651 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 47,877 psi | 74% | 2743 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 90% | 42,032 psi | 65% | 2684 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 40,915 psi | 63% | 2579 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,769 psi | 61% | 2559 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,070 psi | 83% | 2795 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,066 psi | 74% | 2703 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,942 psi | 58% | 2536 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,744 psi | 69% | 2707 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 54,781 psi | 84% | 2825 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,156 psi | 80% | 2792 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,214 psi | 82% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,991 psi | 69% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,972 psi | 60% | 2507 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,626 psi | 64% | 2680 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 52,997 psi | 82% | 2694 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,346 psi | 84% | 2808 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,918 psi | 68% | 2654 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 52,562 psi | 81% | 2792 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 32,982 psi | 51% | 2513 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 40,059 psi | 62% | 2615 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 53,751 psi | 83% | 2680 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,169 psi | 77% | 2680 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,270 psi | 77% | 2694 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,858 psi | 64% | 2585 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,971 psi | 58% | 2556 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 42,047 psi | 65% | 2648 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 48,544 psi | 75% | 2687 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,333 psi | 57% | 2556 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 28,747 psi | 44% | 2398 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 96% | 49,327 psi | 76% | 2881 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,057 psi | 57% | 2526 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 38,740 psi | 60% | 2608 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,368 psi | 41% | 2405 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,996 psi | 80% | 2795 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,179 psi | 70% | 2710 fps | 95.8% |
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 104 powders for .280 Ackley Improved loaded with the .284 | 150gr | Berger Classic Hybrid Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 3,061 fps; across all powders the maximum-charge window runs from 1,772 fps to 3,061 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 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 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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-16, Alliant Reloder-26 rank at the top here: for .280 Ackley Improved with the .284 | 150gr | Berger Classic Hybrid Hunter 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.