Load Specifications
Bullet:.284 | 139gr | Hasler ARIETE
Bullet Manufacturer:Hasler
Bullet Weight:139 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 | 139gr | Hasler ARIETE 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 60, ReloadSwiss RS 70 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 2015 | <<locked>> | 84% | 58,146 psi | 89% | 2854 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,913 psi | 88% | 2877 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,347 psi | 85% | 2900 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,289 psi | 87% | 2894 fps | 97.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,309 psi | 68% | 2785 fps | 97.1% |
| Accurate 4064 | <<locked>> | 90% | 57,290 psi | 88% | 2933 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 58,044 psi | 89% | 3031 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 86% | 57,522 psi | 88% | 2969 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 58,653 psi | 90% | 2969 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,315 psi | 80% | 2949 fps | 96.1% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,289 psi | 87% | 2913 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 57,580 psi | 89% | 2884 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 57,899 psi | 89% | 3100 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 51,953 psi | 80% | 2946 fps | 96.2% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 51,953 psi | 80% | 2946 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,463 psi | 85% | 2943 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,927 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 55,317 psi | 85% | 3038 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,652 psi | 87% | 3071 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,198 psi | 79% | 2936 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,250 psi | 65% | 2818 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,747 psi | 73% | 2995 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 57,653 psi | 89% | 2989 fps | 99.9% |
| Bofors RP3 | <<locked>> | 90% | 56,028 psi | 86% | 2956 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,782 psi | 86% | 2930 fps | 97.9% |
| Hodgdon Benchmark | <<locked>> | 84% | 57,957 psi | 89% | 2897 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,970 psi | 86% | 2943 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 58,523 psi | 90% | 3054 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 57,000 psi | 88% | 2976 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 96% | 57,101 psi | 88% | 3031 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 94% | 57,203 psi | 88% | 2989 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 86% | 58,131 psi | 89% | 2979 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 55,114 psi | 85% | 2956 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 58,044 psi | 89% | 3015 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 57,812 psi | 89% | 3071 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,592 psi | 55% | 1804 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,709 psi | 86% | 2927 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 58,465 psi | 90% | 2956 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 58,160 psi | 89% | 2953 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 58,001 psi | 89% | 2940 fps | 98.6% |
| IMR 4350 | <<locked>> | 98% | 56,594 psi | 87% | 2959 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 94% | 57,870 psi | 89% | 2963 fps | 98.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 58,494 psi | 90% | 3022 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 57,392 psi | 88% | 2995 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,289 psi | 87% | 2913 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 57,508 psi | 88% | 2940 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 56,652 psi | 87% | 2890 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 57,928 psi | 89% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 57,261 psi | 88% | 2953 fps | 99.4% |
| Lovex S070 | <<locked>> | 98% | 58,566 psi | 90% | 2995 fps | 98.9% |
| Norma 201 | <<locked>> | 86% | 55,999 psi | 86% | 2910 fps | 100% |
| Norma 202 | <<locked>> | 86% | 56,855 psi | 87% | 2910 fps | 100% |
| Norma 203B | <<locked>> | 90% | 58,566 psi | 90% | 2999 fps | 100% |
| Norma 204 | <<locked>> | 98% | 57,334 psi | 88% | 3012 fps | 97% |
| Norma MRPᴾ | <<locked>> | 100% | 47,514 psi | 73% | 2949 fps | 96.8% |
| Norma URP | <<locked>> | 98% | 56,927 psi | 88% | 3018 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 55,869 psi | 86% | 2976 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,492 psi | 85% | 3012 fps | 99% |
| Ramshot TAC | <<locked>> | 84% | 56,782 psi | 87% | 2943 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,550 psi | 87% | 2956 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 57,188 psi | 88% | 2920 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,129 psi | 56% | 1850 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 57,000 psi | 88% | 2953 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 56,536 psi | 87% | 3031 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 56,376 psi | 87% | 3068 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 57,899 psi | 89% | 3054 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 57,101 psi | 88% | 3087 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 56,710 psi | 87% | 2887 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 56,507 psi | 87% | 2907 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 55,840 psi | 86% | 2946 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,125 psi | 77% | 2920 fps | 96% |
| Rottweil R 907 | <<locked>> | 94% | 55,782 psi | 86% | 2930 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 96% | 57,261 psi | 88% | 2953 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 57,508 psi | 88% | 2940 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 57,928 psi | 89% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 58,566 psi | 90% | 2995 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 57,827 psi | 89% | 3012 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,201 psi | 85% | 2917 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,927 psi | 86% | 2940 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 57,551 psi | 89% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 58,131 psi | 89% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 57,493 psi | 88% | 2907 fps | 98.6% |
| Somchem S321 | <<locked>> | 82% | 57,740 psi | 89% | 2946 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 56,782 psi | 87% | 2841 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 58,784 psi | 90% | 2963 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 55,985 psi | 86% | 2943 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 55,100 psi | 85% | 3015 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,850 psi | 78% | 2897 fps | 97% |
| Vihtavuori N130 | <<locked>> | 82% | 57,130 psi | 88% | 2802 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 57,943 psi | 89% | 2828 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 56,724 psi | 87% | 2871 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 57,421 psi | 88% | 2887 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 57,856 psi | 89% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,550 psi | 85% | 2959 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 84% | 57,029 psi | 88% | 2917 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,608 psi | 86% | 2884 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 58,247 psi | 90% | 3015 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,804 psi | 72% | 2897 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,912 psi | 86% | 2936 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 57,203 psi | 88% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 57,101 psi | 88% | 3031 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,652 psi | 58% | 2831 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,985 psi | 86% | 2946 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% | 51,358 psi | 79% | 2762 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,700 psi | 67% | 2680 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,445 psi | 79% | 2844 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 45,919 psi | 71% | 2717 fps | 95.5% |
| Accurate 3100 | <<locked>> | 96% | 38,522 psi | 59% | 2667 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 41,379 psi | 64% | 2680 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 32,938 psi | 51% | 2556 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 47,471 psi | 73% | 2805 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 40,234 psi | 62% | 2648 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 98% | 49,124 psi | 76% | 2894 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,632 psi | 76% | 2812 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,575 psi | 78% | 2789 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,482 psi | 67% | 2844 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 48,878 psi | 75% | 2890 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 48,878 psi | 75% | 2890 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,016 psi | 62% | 2671 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,033 psi | 66% | 2740 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,054 psi | 51% | 2572 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,766 psi | 53% | 2644 fps | 97.9% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,138 psi | 74% | 2877 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,616 psi | 44% | 2470 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 92% | 35,592 psi | 55% | 2723 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 46,876 psi | 72% | 2812 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 39,813 psi | 61% | 2674 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 43,410 psi | 67% | 2707 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,184 psi | 79% | 2795 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,733 psi | 75% | 2831 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 54,389 psi | 84% | 2992 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 80% | 40,596 psi | 62% | 2680 fps | 97.3% |
| Hodgdon H414 | <<locked>> | 86% | 40,625 psi | 63% | 2730 fps | 95% |
| Hodgdon H4350 | <<locked>> | 88% | 47,166 psi | 73% | 2815 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 47,935 psi | 74% | 2818 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,442 psi | 44% | 2415 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,280 psi | 68% | 2792 fps | 99.8% |
| Hodgdon Superformance | 56.8 gr | 88% | 43,018 psi | 66% | 2805 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,513 psi | 41% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,876 psi | 71% | 2766 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 47,892 psi | 74% | 2805 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,279 psi | 65% | 2684 fps | 98.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,657 psi | 69% | 2707 fps | 96.1% |
| IMR 4350 | <<locked>> | 90% | 43,729 psi | 67% | 2736 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,250 psi | 65% | 2684 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 31,836 psi | 49% | 2513 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 44,121 psi | 68% | 2769 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 49,632 psi | 76% | 2812 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,833 psi | 72% | 2779 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,065 psi | 72% | 2736 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 42,163 psi | 65% | 2684 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 36,840 psi | 57% | 2572 fps | 95.2% |
| Lovex S070 | <<locked>> | 88% | 42,482 psi | 65% | 2713 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 46,311 psi | 71% | 2753 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,760 psi | 72% | 2756 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,409 psi | 65% | 2726 fps | 99.1% |
| Norma 204 | <<locked>> | 94% | 49,908 psi | 77% | 2887 fps | 95.4% |
| Norma MRP | <<locked>> | 98% | 44,338 psi | 68% | 2884 fps | 95.9% |
| Norma URP | <<locked>> | 82% | 33,156 psi | 51% | 2559 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 42,206 psi | 65% | 2743 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 39,624 psi | 61% | 2720 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 49,487 psi | 76% | 2822 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,371 psi | 76% | 2844 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 53,359 psi | 82% | 2861 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,847 psi | 41% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,031 psi | 63% | 2664 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 45,847 psi | 71% | 2851 fps | 99.2% |
| ReloadSwiss RS 60 | 48.9 gr | 80% | 37,057 psi | 57% | 2713 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,201 psi | 54% | 2635 fps | 95.8% |
| ReloadSwiss RS 70 | 53.4 gr | 86% | 37,579 psi | 58% | 2707 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 50,270 psi | 77% | 2789 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,961 psi | 68% | 2700 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 37,434 psi | 58% | 2618 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 98% | 46,688 psi | 72% | 2854 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 86% | 43,410 psi | 67% | 2707 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,840 psi | 57% | 2572 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,833 psi | 72% | 2779 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,163 psi | 65% | 2684 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 88% | 42,482 psi | 65% | 2713 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,595 psi | 59% | 2671 fps | 98.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,993 psi | 74% | 2799 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,948 psi | 71% | 2772 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,732 psi | 73% | 2700 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,856 psi | 61% | 2562 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,379 psi | 64% | 2628 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 53,795 psi | 83% | 2890 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,224 psi | 73% | 2700 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,674 psi | 73% | 2792 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 38,218 psi | 59% | 2625 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 27,673 psi | 43% | 2448 fps | 96.6% |
| Somchem S385 | <<locked>> | 96% | 44,353 psi | 68% | 2779 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 53,751 psi | 83% | 2756 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,196 psi | 74% | 2694 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,918 psi | 68% | 2680 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,440 psi | 68% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,361 psi | 56% | 2559 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 34,809 psi | 54% | 2569 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 49,821 psi | 77% | 2808 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,757 psi | 66% | 2677 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,171 psi | 53% | 2562 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 88% | 31,154 psi | 48% | 2552 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,082 psi | 49% | 2480 fps | 97.2% |
| Winchester 748 | <<locked>> | 80% | 49,980 psi | 77% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 40,625 psi | 63% | 2730 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,761 psi | 44% | 2552 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,571 psi | 70% | 2779 fps | 99.7% |
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 | 139gr | Hasler ARIETE. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,100 fps; across all powders the maximum-charge window runs from 1,804 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 139.0 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 60, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 139gr | 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.