Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:140 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 | 140gr | Peregrine Plainsmaster (VLR-4) bullet and 103 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 2015 | <<locked>> | 82% | 55,506 psi | 85% | 2815 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 58,146 psi | 89% | 2887 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,202 psi | 86% | 2907 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,174 psi | 88% | 2907 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,527 psi | 70% | 2802 fps | 97.6% |
| Accurate 4064 | <<locked>> | 90% | 58,479 psi | 90% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,463 psi | 85% | 2992 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 58,610 psi | 90% | 2979 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,202 psi | 86% | 2930 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,403 psi | 82% | 2966 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,334 psi | 88% | 2927 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,969 psi | 85% | 2841 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,114 psi | 85% | 3051 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,113 psi | 82% | 2963 fps | 96.6% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,113 psi | 82% | 2963 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,521 psi | 87% | 2953 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,000 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,318 psi | 87% | 3048 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 58,030 psi | 89% | 3084 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,330 psi | 81% | 2953 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,294 psi | 67% | 2835 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,182 psi | 76% | 3018 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 58,668 psi | 90% | 2999 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 57,101 psi | 88% | 2966 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,014 psi | 88% | 2946 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 58,653 psi | 90% | 2900 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 57,029 psi | 88% | 2956 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 58,059 psi | 89% | 2986 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 58,436 psi | 90% | 3048 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 94% | 58,479 psi | 90% | 3005 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 84% | 55,535 psi | 85% | 2936 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,507 psi | 87% | 2969 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,347 psi | 85% | 2969 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,810 psi | 84% | 3022 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,766 psi | 55% | 1808 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,768 psi | 87% | 2940 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,782 psi | 86% | 2913 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,506 psi | 85% | 2910 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,288 psi | 85% | 2894 fps | 98.4% |
| IMR 4350 | <<locked>> | 98% | 57,493 psi | 88% | 2969 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 58,798 psi | 90% | 2976 fps | 98.8% |
| IMR 4831 | <<locked>> | 98% | 55,956 psi | 86% | 2979 fps | 99.9% |
| IMR 4895 | <<locked>> | 88% | 58,494 psi | 90% | 3005 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 57,334 psi | 88% | 2927 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 58,653 psi | 90% | 2949 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,638 psi | 89% | 2904 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,303 psi | 85% | 2904 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 58,204 psi | 90% | 2966 fps | 99.5% |
| Lovex S070 | <<locked>> | 96% | 56,072 psi | 86% | 2953 fps | 98.7% |
| Norma 201 | <<locked>> | 86% | 57,072 psi | 88% | 2920 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,653 psi | 89% | 2913 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,202 psi | 86% | 2963 fps | 100% |
| Norma 204 | <<locked>> | 98% | 58,581 psi | 90% | 3028 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 48,588 psi | 75% | 2969 fps | 97.3% |
| Norma URP | <<locked>> | 98% | 57,943 psi | 89% | 3028 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 56,884 psi | 88% | 2986 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 56,739 psi | 87% | 3028 fps | 99.3% |
| Ramshot TAC | <<locked>> | 84% | 57,754 psi | 89% | 2953 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 57,580 psi | 89% | 2966 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 58,160 psi | 89% | 2927 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,303 psi | 56% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 58,276 psi | 90% | 2969 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 57,740 psi | 89% | 3045 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 57,783 psi | 89% | 3081 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,332 psi | 85% | 3012 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 58,349 psi | 90% | 3100 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 57,566 psi | 89% | 2894 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,595 psi | 89% | 2917 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,971 psi | 88% | 2956 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,343 psi | 79% | 2936 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 57,014 psi | 88% | 2946 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 58,204 psi | 90% | 2966 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 58,653 psi | 90% | 2949 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,303 psi | 85% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,072 psi | 86% | 2953 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,434 psi | 85% | 2972 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,188 psi | 86% | 2930 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,927 psi | 88% | 2949 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 58,334 psi | 90% | 2851 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,317 psi | 85% | 2802 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 58,668 psi | 90% | 2920 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,850 psi | 78% | 2930 fps | 96.4% |
| Somchem S321 | <<locked>> | 82% | 58,755 psi | 90% | 2956 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 57,827 psi | 89% | 2848 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,028 psi | 86% | 2917 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 57,072 psi | 88% | 2953 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,521 psi | 87% | 3028 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,069 psi | 80% | 2913 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 82% | 57,943 psi | 89% | 2808 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 58,726 psi | 90% | 2835 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,595 psi | 89% | 2874 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 58,494 psi | 90% | 2894 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,056 psi | 85% | 2881 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,884 psi | 88% | 2972 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 57,798 psi | 89% | 2923 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,608 psi | 87% | 2894 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,738 psi | 86% | 2976 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,095 psi | 74% | 2913 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,014 psi | 88% | 2946 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 58,320 psi | 90% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 58,436 psi | 90% | 3048 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,783 psi | 60% | 2858 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,985 psi | 88% | 2956 fps | 100% |
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% | 52,214 psi | 80% | 2769 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,585 psi | 69% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,547 psi | 81% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,830 psi | 67% | 2677 fps | 95.2% |
| Accurate 3100 | <<locked>> | 94% | 36,898 psi | 57% | 2628 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 42,206 psi | 65% | 2687 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,663 psi | 52% | 2572 fps | 95.8% |
| ADI AR 2206H | <<locked>> | 80% | 48,211 psi | 74% | 2815 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 80% | 40,915 psi | 63% | 2657 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 49,937 psi | 77% | 2907 fps | 95.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,372 psi | 77% | 2818 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,532 psi | 79% | 2795 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,440 psi | 68% | 2861 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 46,746 psi | 72% | 2848 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 46,746 psi | 72% | 2848 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,988 psi | 63% | 2687 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,787 psi | 67% | 2749 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,647 psi | 49% | 2530 fps | 95% |
| Alliant Reloder-17 | 49.5 gr | 80% | 35,389 psi | 54% | 2657 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 98% | 49,255 psi | 76% | 2897 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,283 psi | 45% | 2490 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 90% | 33,924 psi | 52% | 2674 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,848 psi | 74% | 2825 fps | 99.3% |
| Bofors RP3 | <<locked>> | 80% | 40,538 psi | 62% | 2687 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 44,063 psi | 68% | 2717 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,938 psi | 80% | 2805 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,734 psi | 77% | 2844 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,524 psi | 64% | 2697 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 41,539 psi | 64% | 2746 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 86% | 45,020 psi | 69% | 2772 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 48,704 psi | 75% | 2825 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,051 psi | 45% | 2428 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,063 psi | 69% | 2799 fps | 99.9% |
| Hodgdon Superformance | 57.6 gr | 88% | 44,034 psi | 68% | 2825 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 41% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,862 psi | 72% | 2776 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 48,834 psi | 75% | 2812 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,989 psi | 66% | 2694 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,571 psi | 70% | 2723 fps | 96.5% |
| IMR 4350 | <<locked>> | 90% | 44,570 psi | 69% | 2749 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 43,091 psi | 66% | 2700 fps | 95.8% |
| IMR 4831 | <<locked>> | 82% | 32,692 psi | 50% | 2530 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 44,933 psi | 69% | 2782 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 50,372 psi | 77% | 2818 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,935 psi | 74% | 2792 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,805 psi | 74% | 2746 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 42,917 psi | 66% | 2694 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 37,695 psi | 58% | 2589 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 40,611 psi | 62% | 2671 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 47,079 psi | 72% | 2762 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,790 psi | 74% | 2769 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,149 psi | 66% | 2736 fps | 99.3% |
| Norma 204 | <<locked>> | 92% | 47,718 psi | 73% | 2844 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 42,163 psi | 65% | 2835 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 34,040 psi | 52% | 2575 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 43,163 psi | 66% | 2756 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 37,855 psi | 58% | 2674 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 50,357 psi | 77% | 2835 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,343 psi | 77% | 2854 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 54,346 psi | 84% | 2871 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,905 psi | 41% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,684 psi | 64% | 2677 fps | 96.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,978 psi | 72% | 2867 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,695 psi | 58% | 2726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,460 psi | 51% | 2585 fps | 95.3% |
| ReloadSwiss RS 70 | 52.8 gr | 84% | 35,694 psi | 55% | 2654 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 51,111 psi | 79% | 2799 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,715 psi | 69% | 2710 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 38,174 psi | 59% | 2631 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 98% | 47,863 psi | 74% | 2874 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 86% | 44,063 psi | 68% | 2717 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,695 psi | 58% | 2589 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,935 psi | 74% | 2792 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,917 psi | 66% | 2694 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 40,611 psi | 62% | 2671 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,508 psi | 61% | 2687 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,936 psi | 75% | 2812 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,891 psi | 72% | 2785 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,501 psi | 75% | 2710 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,567 psi | 62% | 2572 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,177 psi | 65% | 2641 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 47,413 psi | 73% | 2867 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 54,795 psi | 84% | 2900 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,979 psi | 74% | 2707 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,660 psi | 75% | 2802 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 38,928 psi | 60% | 2638 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 28,427 psi | 44% | 2467 fps | 97.1% |
| Somchem S385 | <<locked>> | 94% | 42,496 psi | 65% | 2740 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 54,578 psi | 84% | 2762 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,979 psi | 75% | 2700 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,773 psi | 69% | 2687 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,165 psi | 69% | 2697 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,057 psi | 57% | 2569 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 33,083 psi | 51% | 2520 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 50,560 psi | 78% | 2815 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,671 psi | 67% | 2690 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 35,012 psi | 54% | 2579 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 88% | 31,850 psi | 49% | 2566 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,735 psi | 50% | 2497 fps | 97.6% |
| Winchester 748 | <<locked>> | 80% | 50,792 psi | 78% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,539 psi | 64% | 2746 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,659 psi | 43% | 2510 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,543 psi | 72% | 2789 fps | 99.9% |
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 103 powders for .280 Ackley Improved loaded with the .284 | 140gr | Peregrine Plainsmaster (VLR-4). ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,808 fps to 3,100 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 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 140.0 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. ReloadSwiss RS 70, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for .280 Ackley Improved with the .284 | 140gr | Peregrine Plainsmaster (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.