Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:160 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 | 160gr | Peregrine VRG-3 bullet and 105 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-26 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 2495 | <<locked>> | 84% | 58,247 psi | 90% | 2707 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,260 psi | 87% | 2740 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,635 psi | 83% | 2776 fps | 99.8% |
| Accurate 4064 | <<locked>> | 86% | 58,421 psi | 90% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,043 psi | 86% | 2825 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,072 psi | 86% | 2920 fps | 96.8% |
| ADI AR 2206H | <<locked>> | 82% | 57,595 psi | 89% | 2792 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,390 psi | 85% | 2749 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,305 psi | 88% | 2874 fps | 98.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,897 psi | 84% | 2871 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,926 psi | 85% | 2871 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 57,276 psi | 88% | 2871 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 57,276 psi | 88% | 2871 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,188 psi | 86% | 2772 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,594 psi | 87% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,985 psi | 88% | 2881 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 58,465 psi | 90% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,434 psi | 87% | 2861 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,751 psi | 83% | 2864 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,604 psi | 78% | 2792 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,976 psi | 68% | 2723 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,505 psi | 84% | 2933 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,899 psi | 89% | 2815 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,197 psi | 76% | 2785 fps | 97.6% |
| Bofors RP3 | <<locked>> | 86% | 56,927 psi | 88% | 2785 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,751 psi | 83% | 2864 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 56,492 psi | 87% | 2779 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 86% | 57,522 psi | 88% | 2808 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 58,392 psi | 90% | 2881 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 90% | 58,262 psi | 90% | 2841 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 98% | 54,839 psi | 84% | 2812 fps | 96.8% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,667 psi | 89% | 2854 fps | 97.3% |
| Hodgdon H4895 | <<locked>> | 82% | 58,247 psi | 90% | 2799 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,261 psi | 88% | 2802 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,332 psi | 85% | 2789 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,134 psi | 66% | 2756 fps | 96.9% |
| Hodgdon Superformance | <<locked>> | 90% | 54,969 psi | 85% | 2864 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 56% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,970 psi | 86% | 2753 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,349 psi | 90% | 2779 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,754 psi | 89% | 2772 fps | 99.6% |
| IMR 4350 | <<locked>> | 94% | 57,551 psi | 89% | 2812 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 58,117 psi | 89% | 2805 fps | 99.6% |
| IMR 4831 | <<locked>> | 94% | 56,391 psi | 87% | 2815 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 58,088 psi | 89% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,623 psi | 87% | 2802 fps | 97.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,228 psi | 80% | 2841 fps | 97% |
| Lovex D073.6 | <<locked>> | 82% | 58,392 psi | 90% | 2766 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,492 psi | 87% | 2717 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 58,682 psi | 90% | 2772 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 58,175 psi | 89% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 55,970 psi | 86% | 2792 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,353 psi | 68% | 2628 fps | 98.7% |
| Norma 201 | <<locked>> | 82% | 56,333 psi | 87% | 2736 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,985 psi | 88% | 2726 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,869 psi | 86% | 2782 fps | 100% |
| Norma 204 | <<locked>> | 94% | 58,755 psi | 90% | 2871 fps | 98.9% |
| Norma MRPᴾ | <<locked>> | 100% | 57,334 psi | 88% | 2949 fps | 99.7% |
| Norma URP | <<locked>> | 94% | 58,566 psi | 90% | 2861 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,797 psi | 87% | 2808 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,446 psi | 81% | 2854 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 57,479 psi | 88% | 2871 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,760 psi | 72% | 2733 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 57% | 1755 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,609 psi | 89% | 2799 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,856 psi | 89% | 2864 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 58,146 psi | 89% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,854 psi | 86% | 2848 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 58,624 psi | 90% | 2936 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,801 psi | 66% | 2743 fps | 97.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,811 psi | 87% | 2733 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,116 psi | 88% | 2782 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,303 psi | 85% | 2789 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 98% | 55,796 psi | 86% | 2848 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 90% | 56,492 psi | 87% | 2779 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 58,175 psi | 89% | 2799 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 58,392 psi | 90% | 2766 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 58,682 psi | 90% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,970 psi | 86% | 2792 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,390 psi | 85% | 2795 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,304 psi | 87% | 2769 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,334 psi | 88% | 2667 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 58,247 psi | 90% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,928 psi | 89% | 2756 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,317 psi | 85% | 2841 fps | 98.7% |
| Somchem S335 | <<locked>> | 82% | 56,840 psi | 87% | 2664 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,956 psi | 88% | 2776 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,072 psi | 88% | 2785 fps | 97.1% |
| Somchem S365 | <<locked>> | 96% | 58,001 psi | 89% | 2861 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,362 psi | 87% | 2825 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 82% | 57,899 psi | 89% | 2648 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,450 psi | 88% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,740 psi | 89% | 2710 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 58,566 psi | 90% | 2753 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,087 psi | 88% | 2805 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,909 psi | 80% | 2743 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 84% | 55,970 psi | 86% | 2710 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,014 psi | 86% | 2808 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,492 psi | 87% | 2864 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,609 psi | 89% | 2940 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,724 psi | 87% | 2772 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 58,668 psi | 90% | 2884 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,672 psi | 70% | 2854 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,289 psi | 87% | 2772 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,637 psi | 87% | 2818 fps | 98.7% |
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% | 50,966 psi | 78% | 2612 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,081 psi | 76% | 2625 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 33,054 psi | 51% | 2395 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 48,385 psi | 74% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,738 psi | 57% | 2490 fps | 98.4% |
| Accurate MAGPRO | <<locked>> | 96% | 48,689 psi | 75% | 2799 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 54,070 psi | 83% | 2740 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,006 psi | 71% | 2602 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 41,176 psi | 63% | 2592 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 47,747 psi | 73% | 2746 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,082 psi | 79% | 2812 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,278 psi | 64% | 2592 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,278 psi | 64% | 2592 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,586 psi | 72% | 2625 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,545 psi | 76% | 2690 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,201 psi | 56% | 2507 fps | 98.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,017 psi | 63% | 2628 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 40,828 psi | 63% | 2585 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 40,930 psi | 63% | 2631 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,208 psi | 40% | 2260 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,836 psi | 49% | 2434 fps | 95.5% |
| Alliant Reloder-26 | 53.3 gr | 82% | 30,008 psi | 46% | 2428 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 54,099 psi | 83% | 2762 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 40,321 psi | 62% | 2618 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 46,717 psi | 72% | 2635 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 40,930 psi | 63% | 2631 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 40,959 psi | 63% | 2510 fps | 96.5% |
| Hodgdon H380 | <<locked>> | 80% | 47,094 psi | 72% | 2648 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 38,986 psi | 60% | 2543 fps | 96.6% |
| Hodgdon H4350 | <<locked>> | 80% | 42,119 psi | 65% | 2566 fps | 96.1% |
| Hodgdon H4831 | <<locked>> | 94% | 47,979 psi | 74% | 2697 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,154 psi | 77% | 2736 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 54,708 psi | 84% | 2749 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,678 psi | 52% | 2405 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,619 psi | 79% | 2736 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,176 psi | 62% | 2684 fps | 95.7% |
| Hodgdon Superformance | 53.6 gr | 80% | 37,956 psi | 58% | 2552 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,137 psi | 42% | 1529 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,504 psi | 81% | 2703 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,356 psi | 74% | 2631 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,676 psi | 78% | 2664 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 36,840 psi | 57% | 2441 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,685 psi | 66% | 2546 fps | 97.4% |
| IMR 4831 | <<locked>> | 80% | 35,433 psi | 55% | 2448 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 50,850 psi | 78% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,847 psi | 72% | 2641 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 45,687 psi | 70% | 2720 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 80% | 54,433 psi | 84% | 2713 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 53,026 psi | 82% | 2667 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,472 psi | 75% | 2628 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,958 psi | 61% | 2493 fps | 98% |
| Lovex S070 | <<locked>> | 80% | 38,145 psi | 59% | 2474 fps | 96.5% |
| Lovex S071 | <<locked>> | 90% | 31,923 psi | 49% | 2365 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 52,852 psi | 81% | 2684 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,737 psi | 83% | 2684 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,878 psi | 75% | 2677 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,510 psi | 64% | 2579 fps | 95.3% |
| Norma MRP | <<locked>> | 88% | 37,434 psi | 58% | 2585 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 36,782 psi | 57% | 2490 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 80% | 49,458 psi | 76% | 2700 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,382 psi | 70% | 2726 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 35,665 psi | 55% | 2474 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 96% | 40,176 psi | 62% | 2605 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,572 psi | 42% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,210 psi | 73% | 2631 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,824 psi | 83% | 2805 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,642 psi | 67% | 2680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,796 psi | 57% | 2513 fps | 98.2% |
| ReloadSwiss RS 70 | 51.5 gr | 80% | 35,737 psi | 55% | 2520 fps | 97.6% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,101 psi | 57% | 2608 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 50,256 psi | 77% | 2638 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,830 psi | 67% | 2579 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,542 psi | 70% | 2625 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 39,813 psi | 61% | 2566 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 40,959 psi | 63% | 2510 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,958 psi | 61% | 2493 fps | 98% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,433 psi | 84% | 2713 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,472 psi | 75% | 2628 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,145 psi | 59% | 2474 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,165 psi | 69% | 2635 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,649 psi | 81% | 2717 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,679 psi | 83% | 2618 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,353 psi | 70% | 2493 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,972 psi | 60% | 2434 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 39,450 psi | 61% | 2559 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 53,447 psi | 82% | 2618 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,280 psi | 68% | 2582 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 49,835 psi | 77% | 2671 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 33,272 psi | 51% | 2448 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 37,652 psi | 58% | 2490 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 54,302 psi | 84% | 2602 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,604 psi | 78% | 2602 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,836 psi | 78% | 2618 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,221 psi | 65% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,159 psi | 59% | 2487 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 92% | 39,769 psi | 61% | 2530 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 49,095 psi | 76% | 2612 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,666 psi | 58% | 2490 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 80% | 28,834 psi | 44% | 2333 fps | 96.3% |
| Vihtavuori N560 | <<locked>> | 94% | 46,731 psi | 72% | 2756 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,347 psi | 57% | 2464 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 39,233 psi | 60% | 2546 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,656 psi | 38% | 2287 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,823 psi | 81% | 2723 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,743 psi | 66% | 2592 fps | 95.9% |
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 105 powders for .280 Ackley Improved loaded with the .284 | 160gr | Peregrine VRG-3. Norma MRP delivers the highest muzzle velocity at 2,949 fps; across all powders the maximum-charge window runs from 1,713 fps to 2,949 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 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 160.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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-26, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 160gr | Peregrine VRG-3 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.