Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:145 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:1:8.5
Load data in caliber .280 Ackley Improved with .284 | 145gr | Peregrine Glider GRM 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, 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% | 55,869 psi | 86% | 2762 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 58,552 psi | 90% | 2835 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,594 psi | 87% | 2858 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,493 psi | 88% | 2858 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,788 psi | 70% | 2759 fps | 97.9% |
| Accurate 4064 | <<locked>> | 90% | 58,610 psi | 90% | 2887 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 55,622 psi | 86% | 2936 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 58,682 psi | 90% | 2927 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,304 psi | 87% | 2877 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,708 psi | 83% | 2923 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,638 psi | 89% | 2874 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,419 psi | 85% | 2792 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,434 psi | 85% | 3002 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,432 psi | 82% | 2917 fps | 96.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,432 psi | 82% | 2917 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,666 psi | 87% | 2900 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,145 psi | 88% | 2923 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 56,768 psi | 87% | 2999 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 58,349 psi | 90% | 3031 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,634 psi | 81% | 2907 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,279 psi | 67% | 2785 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,058 psi | 59% | 2687 fps | 96.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,197 psi | 76% | 2969 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,245 psi | 85% | 2894 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 57,406 psi | 88% | 2913 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,014 psi | 88% | 2890 fps | 98.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,492 psi | 85% | 2802 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 57,232 psi | 88% | 2900 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 58,349 psi | 90% | 2936 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 96% | 58,320 psi | 90% | 2992 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 94% | 58,581 psi | 90% | 2953 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 84% | 55,825 psi | 86% | 2884 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 56,710 psi | 87% | 2917 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,579 psi | 86% | 2917 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,998 psi | 85% | 2972 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,665 psi | 55% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,145 psi | 88% | 2887 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 55,999 psi | 86% | 2861 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,825 psi | 86% | 2861 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,361 psi | 85% | 2841 fps | 98.6% |
| IMR 4350 | <<locked>> | 98% | 57,696 psi | 89% | 2920 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,361 psi | 85% | 2871 fps | 98.5% |
| IMR 4831 | <<locked>> | 98% | 56,188 psi | 86% | 2930 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 58,653 psi | 90% | 2953 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 57,638 psi | 89% | 2874 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 54,955 psi | 85% | 2844 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,899 psi | 89% | 2851 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,622 psi | 86% | 2854 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 58,595 psi | 90% | 2917 fps | 99.7% |
| Lovex S070 | <<locked>> | 96% | 56,159 psi | 86% | 2904 fps | 98.9% |
| Norma 201 | <<locked>> | 86% | 57,043 psi | 88% | 2864 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,957 psi | 89% | 2864 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,333 psi | 87% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,955 psi | 85% | 2920 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 48,762 psi | 75% | 2920 fps | 97.6% |
| Norma URP | <<locked>> | 98% | 58,146 psi | 89% | 2976 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 57,290 psi | 88% | 2936 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 57,145 psi | 88% | 2979 fps | 99.4% |
| Ramshot TAC | <<locked>> | 84% | 57,943 psi | 89% | 2900 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 57,769 psi | 89% | 2917 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 58,276 psi | 90% | 2874 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,260 psi | 56% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 58,305 psi | 90% | 2917 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 58,001 psi | 89% | 2992 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 57,986 psi | 89% | 3028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 55,347 psi | 85% | 2959 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 58,523 psi | 90% | 3051 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 57,696 psi | 89% | 2838 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,914 psi | 89% | 2867 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 57,217 psi | 88% | 2907 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 55,521 psi | 85% | 2894 fps | 96.1% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,605 psi | 79% | 2890 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 94% | 57,014 psi | 88% | 2890 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 58,595 psi | 90% | 2917 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 54,955 psi | 85% | 2844 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,622 psi | 86% | 2854 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,159 psi | 86% | 2904 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,477 psi | 85% | 2920 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,420 psi | 87% | 2877 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,087 psi | 88% | 2897 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 58,494 psi | 90% | 2799 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,637 psi | 86% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,230 psi | 85% | 2818 fps | 98.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,184 psi | 79% | 2887 fps | 96.7% |
| Somchem S335 | <<locked>> | 86% | 57,798 psi | 89% | 2795 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,275 psi | 87% | 2867 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 57,305 psi | 88% | 2900 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 56,869 psi | 87% | 2979 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,127 psi | 80% | 2864 fps | 97.7% |
| Vihtavuori N130 | <<locked>> | 82% | 57,972 psi | 89% | 2753 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 55,405 psi | 85% | 2736 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,885 psi | 89% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 58,581 psi | 90% | 2841 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,303 psi | 85% | 2831 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,072 psi | 88% | 2923 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 58,146 psi | 89% | 2871 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 56,797 psi | 87% | 2841 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,985 psi | 86% | 2927 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,356 psi | 74% | 2867 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,116 psi | 88% | 2897 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 58,479 psi | 90% | 2920 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 58,668 psi | 90% | 2995 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,870 psi | 60% | 2812 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 57,261 psi | 88% | 2907 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% | 52,518 psi | 81% | 2720 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,947 psi | 69% | 2644 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,866 psi | 81% | 2805 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,077 psi | 68% | 2631 fps | 95.5% |
| Accurate 3100 | <<locked>> | 94% | 36,970 psi | 57% | 2585 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 42,540 psi | 65% | 2644 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,604 psi | 49% | 2474 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 48,602 psi | 75% | 2769 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,176 psi | 63% | 2615 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 96% | 47,021 psi | 72% | 2802 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,778 psi | 78% | 2772 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,909 psi | 80% | 2746 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,744 psi | 69% | 2815 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 46,876 psi | 72% | 2799 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 46,876 psi | 72% | 2799 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,060 psi | 63% | 2638 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,164 psi | 68% | 2707 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,879 psi | 49% | 2493 fps | 95.5% |
| Alliant Reloder-17 | 48.4 gr | 80% | 35,607 psi | 55% | 2618 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 96% | 46,253 psi | 71% | 2792 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,586 psi | 42% | 2395 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 98% | 35,592 psi | 55% | 2625 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,098 psi | 52% | 2635 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,153 psi | 74% | 2779 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 40,944 psi | 63% | 2644 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 41,640 psi | 64% | 2621 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,272 psi | 80% | 2756 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,067 psi | 77% | 2799 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,684 psi | 64% | 2651 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 41,669 psi | 64% | 2700 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 86% | 45,353 psi | 70% | 2730 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 49,095 psi | 76% | 2779 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,254 psi | 45% | 2388 fps | 96.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,295 psi | 70% | 2753 fps | 99.9% |
| Hodgdon Superformance | 55 gr | 86% | 41,089 psi | 63% | 2717 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 41% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,963 psi | 72% | 2730 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 49,182 psi | 76% | 2762 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,265 psi | 67% | 2651 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,687 psi | 70% | 2674 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 42,090 psi | 65% | 2651 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,509 psi | 62% | 2595 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 30,748 psi | 47% | 2434 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 45,266 psi | 70% | 2736 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 50,778 psi | 78% | 2772 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,167 psi | 74% | 2743 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,080 psi | 74% | 2700 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,192 psi | 66% | 2651 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,520 psi | 55% | 2493 fps | 95.2% |
| Lovex S070 | <<locked>> | 86% | 40,857 psi | 63% | 2631 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 47,398 psi | 73% | 2717 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,892 psi | 74% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,526 psi | 67% | 2694 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 47,848 psi | 74% | 2799 fps | 95.4% |
| Norma MRP | <<locked>> | 96% | 42,424 psi | 65% | 2795 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 32,010 psi | 49% | 2480 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 43,453 psi | 67% | 2713 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 38,014 psi | 58% | 2631 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 50,720 psi | 78% | 2789 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,415 psi | 78% | 2805 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 54,679 psi | 84% | 2825 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,093 psi | 42% | 1621 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,901 psi | 64% | 2635 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,239 psi | 73% | 2818 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,942 psi | 58% | 2680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 33,736 psi | 52% | 2549 fps | 95.8% |
| ReloadSwiss RS 70 | 51.6 gr | 84% | 35,824 psi | 55% | 2612 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 51,068 psi | 79% | 2743 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,976 psi | 69% | 2664 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,508 psi | 59% | 2589 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 98% | 51,851 psi | 80% | 2835 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 96% | 45,063 psi | 69% | 2772 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 84% | 41,640 psi | 64% | 2621 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,520 psi | 55% | 2493 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,167 psi | 74% | 2743 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,192 psi | 66% | 2651 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 40,857 psi | 63% | 2631 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,711 psi | 61% | 2644 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,008 psi | 75% | 2762 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,108 psi | 72% | 2740 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,428 psi | 75% | 2657 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,509 psi | 62% | 2523 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 39,668 psi | 61% | 2543 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 44,628 psi | 69% | 2769 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 48,298 psi | 74% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,979 psi | 75% | 2756 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,204 psi | 60% | 2595 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 28,500 psi | 44% | 2428 fps | 97.5% |
| Somchem S385 | <<locked>> | 94% | 42,598 psi | 66% | 2697 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 54,520 psi | 84% | 2707 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,936 psi | 75% | 2644 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,773 psi | 69% | 2638 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,527 psi | 70% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,362 psi | 57% | 2526 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 33,417 psi | 51% | 2484 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 51,010 psi | 78% | 2769 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,845 psi | 67% | 2644 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,851 psi | 51% | 2480 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 86% | 29,863 psi | 46% | 2467 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,996 psi | 51% | 2457 fps | 98% |
| Winchester 748 | <<locked>> | 80% | 51,068 psi | 79% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 39,088 psi | 60% | 2648 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 90% | 27,688 psi | 43% | 2474 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,818 psi | 72% | 2743 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 104 powders for .280 Ackley Improved loaded with the .284 | 145gr | Peregrine Glider GRM. ReloadSwiss RS 70 delivers the highest muzzle velocity at 3,051 fps; across all powders the maximum-charge window runs from 1,765 fps to 3,051 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 55–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:8.5 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 | 145gr | Peregrine Glider GRM 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.