Load Specifications
Bullet:.284 | 145gr | Hasler ARIETE
Bullet Manufacturer:Hasler
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:1:9.0
Load data in caliber .280 Ackley Improved with .284 | 145gr | Hasler ARIETE bullet and 107 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% | 56,318 psi | 87% | 2772 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,288 psi | 85% | 2795 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 57,232 psi | 88% | 2867 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,914 psi | 89% | 2867 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,543 psi | 72% | 2776 fps | 98.1% |
| Accurate 4064 | <<locked>> | 88% | 55,753 psi | 86% | 2851 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,521 psi | 87% | 2956 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 55,840 psi | 86% | 2887 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,869 psi | 87% | 2887 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 54,360 psi | 84% | 2936 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 84% | 58,247 psi | 90% | 2887 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,869 psi | 86% | 2802 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,999 psi | 86% | 3012 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,128 psi | 83% | 2930 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 57,261 psi | 88% | 2910 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,754 psi | 89% | 2933 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,609 psi | 89% | 3015 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,201 psi | 85% | 2989 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 53,301 psi | 82% | 2920 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,947 psi | 68% | 2799 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,609 psi | 59% | 2703 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,154 psi | 77% | 2986 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,796 psi | 86% | 2904 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 57,943 psi | 89% | 2927 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,783 psi | 89% | 2907 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,115 psi | 86% | 2815 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 58,088 psi | 89% | 2917 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 55,071 psi | 85% | 2890 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 94% | 55,303 psi | 85% | 2949 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 92% | 55,608 psi | 86% | 2913 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 84% | 56,434 psi | 87% | 2897 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 57,566 psi | 89% | 2933 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 56,463 psi | 87% | 2933 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 55,956 psi | 86% | 2992 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,868 psi | 55% | 1775 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,696 psi | 89% | 2900 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,739 psi | 87% | 2871 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 56,391 psi | 87% | 2874 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,898 psi | 86% | 2854 fps | 98.7% |
| IMR 4350 | <<locked>> | 98% | 58,421 psi | 90% | 2936 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 56,144 psi | 86% | 2884 fps | 98.7% |
| IMR 4831 | <<locked>> | 98% | 56,985 psi | 88% | 2946 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 55,477 psi | 85% | 2910 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 58,247 psi | 90% | 2887 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,912 psi | 86% | 2861 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 58,494 psi | 90% | 2864 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 56,246 psi | 87% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,622 psi | 86% | 2877 fps | 99.5% |
| Lovex S070 | <<locked>> | 96% | 56,942 psi | 88% | 2917 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,348 psi | 59% | 2618 fps | 96% |
| Norma 201 | <<locked>> | 86% | 57,667 psi | 89% | 2874 fps | 100% |
| Norma 202 | <<locked>> | 86% | 58,581 psi | 90% | 2874 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,942 psi | 88% | 2920 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,695 psi | 86% | 2936 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 49,676 psi | 76% | 2940 fps | 97.9% |
| Norma URP | <<locked>> | 96% | 55,448 psi | 85% | 2943 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 58,102 psi | 89% | 2949 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 57,870 psi | 89% | 2992 fps | 99.5% |
| Ramshot TAC | <<locked>> | 84% | 58,421 psi | 90% | 2913 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 58,334 psi | 90% | 2927 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 58,813 psi | 90% | 2887 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,448 psi | 56% | 1818 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,361 psi | 85% | 2877 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,042 psi | 85% | 2949 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,607 psi | 84% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,463 psi | 87% | 2979 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,274 psi | 85% | 3005 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 58,392 psi | 90% | 2851 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 58,508 psi | 90% | 2881 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 58,146 psi | 89% | 2923 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 56,217 psi | 86% | 2910 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 52,388 psi | 81% | 2907 fps | 97% |
| Rottweil R 907 | <<locked>> | 94% | 57,783 psi | 89% | 2907 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,622 psi | 86% | 2877 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,912 psi | 86% | 2861 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 56,246 psi | 87% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,942 psi | 88% | 2917 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,304 psi | 87% | 2933 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,927 psi | 88% | 2887 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,943 psi | 89% | 2913 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,608 psi | 86% | 2766 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 56,231 psi | 87% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,637 psi | 86% | 2828 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,909 psi | 80% | 2900 fps | 96.9% |
| Somchem S335 | <<locked>> | 86% | 58,378 psi | 90% | 2805 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,782 psi | 87% | 2877 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 58,146 psi | 89% | 2917 fps | 100% |
| Somchem S361ᴾ | <<locked>> | 100% | 58,233 psi | 90% | 2904 fps | 95.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 57,769 psi | 89% | 2992 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,113 psi | 82% | 2884 fps | 97.9% |
| Vihtavuori N130 | <<locked>> | 82% | 58,653 psi | 90% | 2766 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 56,043 psi | 86% | 2746 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 58,581 psi | 90% | 2835 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,709 psi | 86% | 2808 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 56,173 psi | 86% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,885 psi | 89% | 2936 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 45,542 psi | 70% | 2740 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 84% | 58,740 psi | 90% | 2884 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 57,348 psi | 88% | 2851 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,739 psi | 87% | 2940 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,153 psi | 76% | 2881 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 57,812 psi | 89% | 2907 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,274 psi | 85% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,637 psi | 86% | 2956 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,436 psi | 61% | 2831 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 58,102 psi | 89% | 2920 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 49,850 psi | 77% | 2822 fps | 96.2% |
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% | 52,939 psi | 81% | 2726 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,368 psi | 70% | 2654 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,519 psi | 82% | 2818 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,570 psi | 69% | 2648 fps | 95.8% |
| Accurate 3100 | <<locked>> | 94% | 37,681 psi | 58% | 2602 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 42,975 psi | 66% | 2654 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,952 psi | 49% | 2484 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 48,950 psi | 75% | 2776 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 41,742 psi | 64% | 2631 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 96% | 47,688 psi | 73% | 2818 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,126 psi | 79% | 2779 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,388 psi | 81% | 2756 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,339 psi | 70% | 2831 fps | 99.5% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 47,558 psi | 73% | 2818 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,669 psi | 64% | 2654 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,527 psi | 69% | 2717 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,169 psi | 49% | 2503 fps | 95.7% |
| Alliant Reloder-17 | 49 gr | 80% | 36,085 psi | 56% | 2631 fps | 98.8% |
| Alliant Reloder-19 | <<locked>> | 96% | 46,920 psi | 72% | 2808 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 86% | 27,963 psi | 43% | 2408 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 98% | 36,129 psi | 56% | 2641 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 90% | 34,664 psi | 53% | 2654 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,704 psi | 75% | 2792 fps | 99.5% |
| Bofors RP3 | <<locked>> | 80% | 41,336 psi | 64% | 2654 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 42,148 psi | 65% | 2635 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,605 psi | 81% | 2762 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,647 psi | 78% | 2808 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,264 psi | 65% | 2664 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 39,624 psi | 61% | 2661 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 86% | 45,876 psi | 71% | 2743 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 49,487 psi | 76% | 2789 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,573 psi | 45% | 2402 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,890 psi | 71% | 2766 fps | 100% |
| Hodgdon Superformance | 55.7 gr | 86% | 41,669 psi | 64% | 2733 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 41% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,572 psi | 73% | 2743 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 49,922 psi | 77% | 2776 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,874 psi | 67% | 2664 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,224 psi | 71% | 2690 fps | 97% |
| IMR 4350 | <<locked>> | 88% | 42,540 psi | 65% | 2664 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,017 psi | 63% | 2612 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 31,096 psi | 48% | 2444 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 45,658 psi | 70% | 2746 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 51,126 psi | 79% | 2779 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,805 psi | 75% | 2756 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,689 psi | 75% | 2713 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 43,816 psi | 67% | 2664 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 35,839 psi | 55% | 2503 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 38,711 psi | 60% | 2585 fps | 95.2% |
| Lovex S071 | <<locked>> | 98% | 35,897 psi | 55% | 2562 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 47,805 psi | 74% | 2726 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,544 psi | 75% | 2730 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,859 psi | 67% | 2703 fps | 99.6% |
| Norma 204 | <<locked>> | 92% | 48,515 psi | 75% | 2815 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 40,190 psi | 62% | 2746 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 32,343 psi | 50% | 2490 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 43,990 psi | 68% | 2723 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 36,143 psi | 56% | 2589 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 51,198 psi | 79% | 2799 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,952 psi | 78% | 2815 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 55,201 psi | 85% | 2835 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,151 psi | 42% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,409 psi | 65% | 2648 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,906 psi | 74% | 2835 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,450 psi | 59% | 2697 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,908 psi | 49% | 2503 fps | 95% |
| ReloadSwiss RS 70 | 51 gr | 82% | 33,895 psi | 52% | 2566 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 51,764 psi | 80% | 2756 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,629 psi | 70% | 2680 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,856 psi | 60% | 2598 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 98% | 52,533 psi | 81% | 2851 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 96% | 45,759 psi | 70% | 2789 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 42,148 psi | 65% | 2635 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,839 psi | 55% | 2503 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,805 psi | 75% | 2756 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,816 psi | 67% | 2664 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 38,711 psi | 60% | 2585 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,263 psi | 62% | 2657 fps | 99% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,545 psi | 76% | 2772 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,674 psi | 73% | 2749 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,081 psi | 76% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,133 psi | 63% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,118 psi | 62% | 2556 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 45,324 psi | 70% | 2785 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 48,646 psi | 75% | 2667 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,545 psi | 76% | 2769 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 39,552 psi | 61% | 2602 fps | 99.2% |
| Somchem S361 | <<locked>> | 98% | 54,505 psi | 84% | 2844 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 28,993 psi | 45% | 2441 fps | 97.7% |
| Somchem S385 | <<locked>> | 94% | 43,279 psi | 67% | 2713 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 55,245 psi | 85% | 2723 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 49,603 psi | 76% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,484 psi | 70% | 2651 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,876 psi | 71% | 2661 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,695 psi | 58% | 2536 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 33,707 psi | 52% | 2493 fps | 96% |
| Vihtavuori N165 | <<locked>> | 98% | 42,743 psi | 66% | 2687 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 51,343 psi | 79% | 2776 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,382 psi | 68% | 2654 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,359 psi | 51% | 2493 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 86% | 30,545 psi | 47% | 2487 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,359 psi | 51% | 2470 fps | 98.1% |
| Winchester 748 | <<locked>> | 80% | 51,706 psi | 80% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 39,624 psi | 61% | 2661 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 28,166 psi | 43% | 2493 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,398 psi | 73% | 2756 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 46,441 psi | 71% | 2759 fps | 95.3% |
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 | 145gr | Hasler ARIETE. Alliant Reloder-16 delivers the highest muzzle velocity at 3,015 fps; across all powders the maximum-charge window runs from 1,775 fps to 3,015 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 145.0 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 | 145gr | Hasler ARIETE 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.