Load Specifications
Bullet Manufacturer:Peregrine
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:1:9.0
Load data in caliber .280 Ackley Improved with .284 | 150gr | Peregrine VLR-4 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 60 and Winchester 760.
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% | 57,392 psi | 88% | 2736 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,637 psi | 87% | 2766 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 58,233 psi | 90% | 2835 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,187 psi | 85% | 2785 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,805 psi | 74% | 2756 fps | 98.6% |
| Accurate 4064 | <<locked>> | 88% | 56,811 psi | 87% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,870 psi | 89% | 2927 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 56,710 psi | 87% | 2854 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,783 psi | 89% | 2854 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,593 psi | 86% | 2913 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,376 psi | 85% | 2799 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,130 psi | 88% | 2766 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,174 psi | 88% | 2982 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,390 psi | 85% | 2907 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 58,320 psi | 90% | 2877 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 58,755 psi | 90% | 2900 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 58,508 psi | 90% | 2979 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,202 psi | 86% | 2956 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,505 psi | 84% | 2897 fps | 97.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 47,863 psi | 74% | 2831 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,020 psi | 69% | 2776 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,508 psi | 61% | 2687 fps | 97.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,358 psi | 79% | 2963 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,811 psi | 87% | 2874 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 55,535 psi | 85% | 2844 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 47,863 psi | 74% | 2831 fps | 96.4% |
| Bofors RP7 | <<locked>> | 92% | 55,332 psi | 85% | 2825 fps | 98.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,855 psi | 87% | 2779 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,071 psi | 85% | 2828 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,101 psi | 86% | 2861 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 56,507 psi | 87% | 2923 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 92% | 56,666 psi | 87% | 2884 fps | 98.2% |
| Hodgdon H4895 | <<locked>> | 84% | 57,334 psi | 88% | 2861 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,216 psi | 85% | 2854 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,580 psi | 89% | 2900 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,985 psi | 88% | 2963 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,839 psi | 55% | 1742 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 58,624 psi | 90% | 2864 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,044 psi | 89% | 2838 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,305 psi | 88% | 2838 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,724 psi | 87% | 2822 fps | 99% |
| IMR 4350 | <<locked>> | 96% | 56,115 psi | 86% | 2858 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,101 psi | 88% | 2854 fps | 99% |
| IMR 4831 | <<locked>> | 98% | 57,972 psi | 89% | 2913 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,739 psi | 87% | 2881 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,187 psi | 85% | 2841 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 82% | 55,376 psi | 85% | 2799 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,942 psi | 88% | 2825 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,869 psi | 86% | 2779 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,159 psi | 88% | 2831 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,652 psi | 87% | 2848 fps | 99.7% |
| Lovex S070 | <<locked>> | 96% | 57,754 psi | 89% | 2884 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,378 psi | 61% | 2598 fps | 96.7% |
| Norma 201 | <<locked>> | 84% | 55,100 psi | 85% | 2792 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,999 psi | 86% | 2792 fps | 100% |
| Norma 203B | <<locked>> | 88% | 57,972 psi | 89% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 96% | 56,971 psi | 88% | 2910 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 50,749 psi | 78% | 2917 fps | 98.4% |
| Norma URP | <<locked>> | 96% | 56,289 psi | 87% | 2907 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,187 psi | 85% | 2861 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,405 psi | 85% | 2913 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 55,753 psi | 86% | 2828 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,637 psi | 86% | 2841 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,448 psi | 56% | 1785 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,376 psi | 87% | 2848 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,130 psi | 86% | 2920 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 55,854 psi | 86% | 2949 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,609 psi | 89% | 2949 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,579 psi | 87% | 2979 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 56,014 psi | 86% | 2769 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,956 psi | 86% | 2795 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,419 psi | 85% | 2838 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,392 psi | 88% | 2884 fps | 96.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,330 psi | 82% | 2877 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 92% | 55,332 psi | 85% | 2825 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,652 psi | 87% | 2848 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,942 psi | 88% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,159 psi | 88% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 57,754 psi | 89% | 2884 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,464 psi | 88% | 2900 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 57,957 psi | 89% | 2858 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,245 psi | 85% | 2825 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,623 psi | 87% | 2730 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,087 psi | 88% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,695 psi | 87% | 2802 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 52,852 psi | 81% | 2874 fps | 97.5% |
| Somchem S335 | <<locked>> | 84% | 55,840 psi | 86% | 2723 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,812 psi | 89% | 2848 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,419 psi | 85% | 2831 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,201 psi | 85% | 2910 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,099 psi | 83% | 2858 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 84% | 57,130 psi | 88% | 2713 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,941 psi | 86% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,637 psi | 87% | 2772 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,232 psi | 88% | 2812 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,259 psi | 85% | 2854 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,644 psi | 72% | 2720 fps | 96.5% |
| Vihtavuori N530 | <<locked>> | 82% | 56,086 psi | 86% | 2802 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 58,334 psi | 90% | 2815 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,001 psi | 89% | 2913 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,183 psi | 77% | 2851 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,998 psi | 85% | 2825 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,579 psi | 87% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,840 psi | 87% | 2927 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,495 psi | 62% | 2815 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,085 psi | 85% | 2831 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 50,821 psi | 78% | 2795 fps | 96.8% |
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% | 53,925 psi | 83% | 2694 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,412 psi | 71% | 2621 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 54,433 psi | 84% | 2782 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,252 psi | 70% | 2618 fps | 96.3% |
| Accurate 3100 | <<locked>> | 92% | 35,926 psi | 55% | 2523 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 43,990 psi | 68% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,880 psi | 51% | 2467 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 80% | 49,995 psi | 77% | 2749 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,366 psi | 65% | 2602 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 45,498 psi | 70% | 2736 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,127 psi | 80% | 2749 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,534 psi | 82% | 2720 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,195 psi | 71% | 2802 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 45,440 psi | 70% | 2736 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,380 psi | 65% | 2621 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,498 psi | 70% | 2690 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,880 psi | 51% | 2484 fps | 96.5% |
| Alliant Reloder-17 | 48.6 gr | 80% | 36,796 psi | 57% | 2608 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 44,817 psi | 69% | 2726 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 44,686 psi | 69% | 2772 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 26,818 psi | 41% | 2336 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 96% | 34,780 psi | 54% | 2569 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 88% | 32,982 psi | 51% | 2569 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,545 psi | 76% | 2759 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 42,308 psi | 65% | 2631 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 44,686 psi | 69% | 2772 fps | 95.5% |
| Bofors RP7 | <<locked>> | 82% | 40,248 psi | 62% | 2556 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,563 psi | 82% | 2733 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,547 psi | 79% | 2776 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,975 psi | 66% | 2638 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 82% | 37,739 psi | 58% | 2579 fps | 95% |
| Hodgdon H4350 | <<locked>> | 84% | 43,700 psi | 67% | 2657 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 50,502 psi | 78% | 2759 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,284 psi | 47% | 2385 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,760 psi | 72% | 2733 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 39,595 psi | 61% | 2648 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,687 psi | 41% | 1555 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,283 psi | 74% | 2710 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,734 psi | 78% | 2740 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,498 psi | 68% | 2635 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,862 psi | 72% | 2657 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 40,770 psi | 63% | 2589 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,160 psi | 60% | 2533 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 31,923 psi | 49% | 2428 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 46,673 psi | 72% | 2720 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 51,663 psi | 79% | 2785 fps | 95.1% |
| IMR 8208 XBR | <<locked>> | 80% | 52,127 psi | 80% | 2749 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,690 psi | 76% | 2723 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,284 psi | 76% | 2680 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,498 psi | 68% | 2631 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,608 psi | 56% | 2480 fps | 96.1% |
| Lovex S070 | <<locked>> | 82% | 37,043 psi | 57% | 2507 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 34,432 psi | 53% | 2490 fps | 95% |
| Norma 201 | <<locked>> | 80% | 48,747 psi | 75% | 2694 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,240 psi | 76% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,846 psi | 69% | 2677 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 46,282 psi | 71% | 2733 fps | 95.5% |
| Norma MRP | <<locked>> | 92% | 38,464 psi | 59% | 2671 fps | 95% |
| Norma URP | <<locked>> | 80% | 33,170 psi | 51% | 2470 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 44,875 psi | 69% | 2697 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 36,912 psi | 57% | 2569 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 52,025 psi | 80% | 2769 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,112 psi | 80% | 2789 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,093 psi | 42% | 1594 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,134 psi | 66% | 2621 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,820 psi | 75% | 2802 fps | 99.9% |
| ReloadSwiss RS 60 | 48.6 gr | 80% | 39,233 psi | 60% | 2671 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,619 psi | 50% | 2484 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 34,548 psi | 53% | 2546 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 52,750 psi | 81% | 2723 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,282 psi | 71% | 2648 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,798 psi | 61% | 2575 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 50,401 psi | 78% | 2772 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 94% | 43,671 psi | 67% | 2710 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 82% | 40,248 psi | 62% | 2556 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,608 psi | 56% | 2480 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,690 psi | 76% | 2723 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,498 psi | 68% | 2631 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 37,043 psi | 57% | 2507 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,031 psi | 63% | 2628 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,705 psi | 78% | 2749 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,457 psi | 75% | 2720 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,995 psi | 77% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,930 psi | 65% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,101 psi | 59% | 2474 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 43,250 psi | 67% | 2703 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 49,545 psi | 76% | 2635 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,401 psi | 78% | 2740 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,437 psi | 62% | 2579 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 29,588 psi | 46% | 2421 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 41,365 psi | 64% | 2635 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 50,531 psi | 78% | 2625 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,441 psi | 71% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,818 psi | 72% | 2631 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,566 psi | 59% | 2513 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 34,563 psi | 53% | 2474 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 98% | 43,526 psi | 67% | 2664 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 52,388 psi | 81% | 2746 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,092 psi | 69% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,997 psi | 52% | 2474 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 84% | 29,124 psi | 45% | 2411 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,982 psi | 52% | 2448 fps | 98.6% |
| Winchester 748 | <<locked>> | 80% | 52,605 psi | 81% | 2792 fps | 100% |
| Winchester 760 | 48.8 gr | 82% | 37,739 psi | 58% | 2579 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 88% | 26,948 psi | 41% | 2418 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,211 psi | 74% | 2726 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 44,034 psi | 68% | 2677 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 107 powders for .280 Ackley Improved loaded with the .284 | 150gr | Peregrine VLR-4. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,982 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,982 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 150.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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 60, Winchester 760 rank at the top here: for .280 Ackley Improved with the .284 | 150gr | Peregrine VLR-4 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.