Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:136 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:1:9.5
Load data in caliber .280 Ackley Improved with .284 | 136gr | Peregrine VLR5 (VLR-5) 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>> | 84% | 58,610 psi | 90% | 2900 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 57,899 psi | 89% | 2930 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,941 psi | 86% | 2949 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,840 psi | 87% | 2943 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,194 psi | 70% | 2835 fps | 97.3% |
| Accurate 4064 | <<locked>> | 90% | 57,783 psi | 89% | 2976 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,868 psi | 84% | 3025 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 86% | 58,059 psi | 89% | 3015 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,666 psi | 86% | 2966 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,171 psi | 82% | 3002 fps | 96.3% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,927 psi | 88% | 2963 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 58,479 psi | 90% | 2933 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 58,494 psi | 90% | 3150 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 52,852 psi | 81% | 2999 fps | 96.3% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 52,852 psi | 81% | 2999 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,941 psi | 86% | 2986 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 56,449 psi | 87% | 3012 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,130 psi | 86% | 3087 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 57,392 psi | 88% | 3120 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,069 psi | 80% | 2989 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,844 psi | 66% | 2864 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 48,646 psi | 75% | 3048 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 58,233 psi | 90% | 3035 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 56,724 psi | 87% | 3005 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 56,652 psi | 87% | 2982 fps | 98% |
| Hodgdon Benchmark | <<locked>> | 84% | 58,262 psi | 90% | 2940 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,695 psi | 87% | 2995 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 57,624 psi | 89% | 3022 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 96% | 57,783 psi | 89% | 3081 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 94% | 58,001 psi | 89% | 3038 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 86% | 58,726 psi | 90% | 3028 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,941 psi | 86% | 3005 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,027 psi | 85% | 3009 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 58,508 psi | 90% | 3123 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,737 psi | 55% | 1841 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 56,304 psi | 87% | 2976 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,361 psi | 85% | 2953 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 58,668 psi | 90% | 3002 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 58,378 psi | 90% | 2982 fps | 98.7% |
| IMR 4350 | <<locked>> | 98% | 57,319 psi | 88% | 3009 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 58,436 psi | 90% | 3009 fps | 98.6% |
| IMR 4831 | <<locked>> | 98% | 55,376 psi | 85% | 3015 fps | 99.8% |
| IMR 4895 | <<locked>> | 88% | 57,928 psi | 89% | 3041 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,927 psi | 88% | 2963 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 58,363 psi | 90% | 2992 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,217 psi | 88% | 2940 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 58,436 psi | 90% | 2992 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,783 psi | 89% | 3002 fps | 99.4% |
| Lovex S070 | <<locked>> | 96% | 55,608 psi | 86% | 2986 fps | 98.5% |
| Norma 201 | <<locked>> | 86% | 56,594 psi | 87% | 2956 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,479 psi | 88% | 2956 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,637 psi | 86% | 2995 fps | 100% |
| Norma 204 | <<locked>> | 98% | 58,218 psi | 90% | 3064 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 48,211 psi | 74% | 2999 fps | 97% |
| Norma URP | <<locked>> | 98% | 57,725 psi | 89% | 3071 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 56,434 psi | 87% | 3022 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 56,434 psi | 87% | 3064 fps | 99.1% |
| Ramshot TAC | <<locked>> | 84% | 57,116 psi | 88% | 2986 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 57,276 psi | 88% | 3005 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,624 psi | 89% | 2963 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,260 psi | 56% | 1883 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 57,870 psi | 89% | 3005 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 57,406 psi | 88% | 3084 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 57,188 psi | 88% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 58,784 psi | 90% | 3104 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 57,914 psi | 89% | 3140 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 57,246 psi | 88% | 2933 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,101 psi | 88% | 2956 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,550 psi | 87% | 2995 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,734 psi | 78% | 2966 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 94% | 56,652 psi | 87% | 2982 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,783 psi | 89% | 3002 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 58,363 psi | 90% | 2992 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 58,436 psi | 90% | 2992 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 55,608 psi | 86% | 2986 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 58,697 psi | 90% | 3061 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,840 psi | 86% | 2966 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 56,637 psi | 87% | 2989 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,972 psi | 89% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 58,595 psi | 90% | 2890 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 58,262 psi | 90% | 2956 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 50,256 psi | 77% | 2959 fps | 96% |
| Somchem S321 | <<locked>> | 82% | 58,204 psi | 90% | 2995 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 57,392 psi | 88% | 2887 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,419 psi | 85% | 2953 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,724 psi | 87% | 2992 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,188 psi | 86% | 3068 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,430 psi | 79% | 2943 fps | 97.1% |
| Vihtavuori N130 | <<locked>> | 82% | 57,392 psi | 88% | 2844 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 58,349 psi | 90% | 2874 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,130 psi | 88% | 2913 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 57,928 psi | 89% | 2933 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 58,450 psi | 90% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 56,376 psi | 87% | 3009 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 57,624 psi | 89% | 2966 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,999 psi | 86% | 2927 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,201 psi | 85% | 3009 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,529 psi | 73% | 2943 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 56,666 psi | 87% | 2982 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 58,030 psi | 89% | 3015 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 58,117 psi | 89% | 3087 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,247 psi | 59% | 2877 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 86% | 56,666 psi | 87% | 2995 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% | 51,663 psi | 79% | 2805 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,251 psi | 68% | 2726 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,098 psi | 80% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 46,383 psi | 71% | 2762 fps | 95.6% |
| Accurate 3100 | <<locked>> | 96% | 39,204 psi | 60% | 2713 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 41,930 psi | 65% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,315 psi | 51% | 2598 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 47,892 psi | 74% | 2851 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,683 psi | 63% | 2694 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 49,734 psi | 77% | 2943 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,067 psi | 77% | 2858 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,923 psi | 78% | 2831 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,005 psi | 68% | 2894 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 49,472 psi | 76% | 2936 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 49,472 psi | 76% | 2936 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,480 psi | 62% | 2717 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,497 psi | 67% | 2782 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,431 psi | 51% | 2615 fps | 95.5% |
| Alliant Reloder-17 | 50.3 gr | 80% | 35,244 psi | 54% | 2690 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,776 psi | 75% | 2927 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,138 psi | 45% | 2516 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 92% | 36,114 psi | 56% | 2769 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,630 psi | 73% | 2861 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 40,219 psi | 62% | 2717 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 43,903 psi | 68% | 2753 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,648 psi | 79% | 2841 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,284 psi | 76% | 2877 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,191 psi | 63% | 2730 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 41,017 psi | 63% | 2776 fps | 95% |
| Hodgdon H4350 | <<locked>> | 88% | 47,819 psi | 74% | 2864 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 48,385 psi | 74% | 2861 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,674 psi | 44% | 2451 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,628 psi | 69% | 2835 fps | 99.8% |
| Hodgdon Superformance | 58.4 gr | 88% | 43,598 psi | 67% | 2854 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 41% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,572 psi | 72% | 2815 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 48,544 psi | 75% | 2851 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,743 psi | 66% | 2730 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,252 psi | 70% | 2756 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 44,295 psi | 68% | 2782 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,786 psi | 66% | 2730 fps | 95.4% |
| IMR 4831 | <<locked>> | 82% | 32,387 psi | 50% | 2556 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 44,585 psi | 69% | 2815 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 50,067 psi | 77% | 2858 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,514 psi | 73% | 2828 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,558 psi | 73% | 2782 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 42,641 psi | 66% | 2730 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 37,217 psi | 57% | 2615 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 40,205 psi | 62% | 2700 fps | 95% |
| Norma 201 | <<locked>> | 80% | 46,818 psi | 72% | 2799 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,224 psi | 73% | 2802 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,830 psi | 66% | 2769 fps | 99.1% |
| Norma 204 | <<locked>> | 94% | 50,589 psi | 78% | 2936 fps | 95.6% |
| Norma MRP | <<locked>> | 96% | 41,901 psi | 64% | 2867 fps | 95% |
| Norma URP | <<locked>> | 82% | 33,736 psi | 52% | 2605 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 42,728 psi | 66% | 2785 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 40,161 psi | 62% | 2762 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 50,212 psi | 77% | 2871 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,893 psi | 77% | 2890 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,882 psi | 83% | 2907 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,992 psi | 42% | 1686 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,321 psi | 64% | 2707 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,528 psi | 72% | 2900 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,565 psi | 58% | 2759 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,650 psi | 55% | 2677 fps | 95.9% |
| ReloadSwiss RS 70 | 53.6 gr | 84% | 35,476 psi | 55% | 2684 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 50,604 psi | 78% | 2835 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,469 psi | 68% | 2746 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 37,884 psi | 58% | 2661 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 98% | 47,384 psi | 73% | 2907 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 86% | 43,903 psi | 68% | 2753 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,217 psi | 57% | 2615 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,514 psi | 73% | 2828 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,641 psi | 66% | 2730 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 40,205 psi | 62% | 2700 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,146 psi | 60% | 2717 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,486 psi | 75% | 2844 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,557 psi | 72% | 2822 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,008 psi | 74% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,147 psi | 62% | 2605 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,814 psi | 64% | 2674 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 46,920 psi | 72% | 2897 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 54,621 psi | 84% | 2940 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,718 psi | 73% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,443 psi | 75% | 2841 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 38,638 psi | 59% | 2667 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 28,166 psi | 43% | 2490 fps | 96.7% |
| Somchem S385 | <<locked>> | 96% | 45,020 psi | 69% | 2828 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 54,085 psi | 83% | 2802 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,501 psi | 75% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,295 psi | 68% | 2723 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,904 psi | 69% | 2736 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,796 psi | 57% | 2598 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 82% | 35,157 psi | 54% | 2608 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 50,227 psi | 77% | 2851 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,337 psi | 67% | 2726 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,650 psi | 53% | 2605 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 88% | 31,589 psi | 49% | 2595 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,590 psi | 50% | 2526 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 50,633 psi | 78% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,249 psi | 63% | 2779 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,254 psi | 45% | 2598 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,151 psi | 71% | 2825 fps | 99.8% |
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 103 powders for .280 Ackley Improved loaded with the .284 | 136gr | Peregrine VLR5 (VLR-5). Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,150 fps; across all powders the maximum-charge window runs from 1,841 fps to 3,150 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 136.0 gr projectile in 0.284" calls for a 1:9.5 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 | 136gr | Peregrine VLR5 (VLR-5) 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.