Load Specifications
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:1:10.0
Load data in caliber .280 Ackley Improved with .284 | 145gr | Hasler Hunting bullet and 107 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and ReloadSwiss RS 70.
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% | 57,508 psi | 88% | 2795 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,797 psi | 87% | 2822 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,666 psi | 87% | 2877 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,666 psi | 87% | 2877 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,681 psi | 87% | 2848 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,863 psi | 74% | 2802 fps | 98.4% |
| Accurate 4064 | <<locked>> | 88% | 56,855 psi | 88% | 2871 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 57,769 psi | 89% | 2979 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 56,855 psi | 88% | 2910 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 58,073 psi | 89% | 2913 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,637 psi | 86% | 2966 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,593 psi | 86% | 2854 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,188 psi | 88% | 2822 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,305 psi | 88% | 3041 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 58,552 psi | 90% | 2936 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,361 psi | 85% | 2907 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,013 psi | 85% | 2982 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,449 psi | 87% | 3012 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,563 psi | 84% | 2949 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,153 psi | 74% | 2884 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,150 psi | 69% | 2828 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,552 psi | 61% | 2730 fps | 97.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,721 psi | 80% | 3018 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,942 psi | 88% | 2927 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 55,477 psi | 85% | 2897 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,153 psi | 74% | 2884 fps | 96.2% |
| Bofors RP7 | <<locked>> | 92% | 55,187 psi | 85% | 2877 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,826 psi | 87% | 2831 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,361 psi | 85% | 2884 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,289 psi | 87% | 2917 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 58,291 psi | 90% | 3002 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 96% | 58,581 psi | 90% | 2966 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 84% | 57,508 psi | 89% | 2920 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,172 psi | 85% | 2904 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 57,798 psi | 89% | 2956 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,217 psi | 88% | 3022 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,955 psi | 55% | 1785 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 57,450 psi | 88% | 2904 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 56,391 psi | 87% | 2871 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,768 psi | 87% | 2884 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,869 psi | 86% | 2861 fps | 98.8% |
| IMR 4350 | <<locked>> | 96% | 56,072 psi | 86% | 2907 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,232 psi | 88% | 2910 fps | 98.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,303 psi | 85% | 2927 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 56,811 psi | 87% | 2933 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,593 psi | 86% | 2854 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,956 psi | 88% | 2881 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,825 psi | 86% | 2831 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 57,246 psi | 88% | 2884 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,739 psi | 87% | 2900 fps | 99.6% |
| Lovex S070 | <<locked>> | 96% | 58,044 psi | 89% | 2943 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,610 psi | 61% | 2648 fps | 96.5% |
| Norma 201 | <<locked>> | 84% | 55,317 psi | 85% | 2848 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,231 psi | 87% | 2851 fps | 100% |
| Norma 203B | <<locked>> | 88% | 58,233 psi | 90% | 2943 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,014 psi | 88% | 2963 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 50,894 psi | 78% | 2969 fps | 98.2% |
| Norma URP | <<locked>> | 96% | 56,594 psi | 87% | 2963 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,303 psi | 85% | 2917 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,346 psi | 84% | 2989 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 96% | 55,492 psi | 85% | 2963 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,934 psi | 72% | 2835 fps | 96.5% |
| Ramshot TAC | <<locked>> | 82% | 55,709 psi | 86% | 2881 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,593 psi | 86% | 2894 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 56% | 1827 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,492 psi | 87% | 2900 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,188 psi | 86% | 2972 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,173 psi | 86% | 3009 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 57,928 psi | 89% | 3005 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,869 psi | 88% | 3038 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 55,854 psi | 86% | 2822 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,825 psi | 86% | 2848 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,622 psi | 86% | 2894 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,537 psi | 89% | 2936 fps | 96.7% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,780 psi | 83% | 2936 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 55,187 psi | 85% | 2877 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,739 psi | 87% | 2900 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,956 psi | 88% | 2881 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,246 psi | 88% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 58,044 psi | 89% | 2943 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,493 psi | 88% | 2953 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 58,160 psi | 90% | 2913 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,245 psi | 85% | 2881 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,666 psi | 87% | 2785 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,203 psi | 88% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,043 psi | 88% | 2858 fps | 98.9% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,287 psi | 82% | 2930 fps | 97.3% |
| Somchem S335 | <<locked>> | 84% | 56,086 psi | 86% | 2782 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 57,986 psi | 89% | 2900 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 55,724 psi | 86% | 2890 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,390 psi | 85% | 2966 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,389 psi | 84% | 2913 fps | 98.2% |
| Unknown powder | <<locked>> | 94% | 57,392 psi | 88% | 2972 fps | 99.9% |
| Vihtavuori N133 | <<locked>> | 84% | 57,174 psi | 88% | 2769 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,217 psi | 86% | 2808 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,695 psi | 87% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,043 psi | 88% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,245 psi | 85% | 2907 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 46,717 psi | 72% | 2769 fps | 96.3% |
| Vihtavuori N530 | <<locked>> | 82% | 55,956 psi | 86% | 2854 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 58,494 psi | 90% | 2871 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,117 psi | 89% | 2966 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,328 psi | 77% | 2904 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,274 psi | 85% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 58,291 psi | 90% | 3002 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,669 psi | 63% | 2867 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,145 psi | 88% | 2943 fps | 97.7% |
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% | 53,824 psi | 83% | 2743 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,543 psi | 72% | 2674 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,040 psi | 82% | 2825 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,040 psi | 82% | 2825 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 43,366 psi | 67% | 2621 fps | 95.6% |
| Accurate 3100 | <<locked>> | 92% | 36,056 psi | 55% | 2572 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 44,063 psi | 68% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,880 psi | 51% | 2513 fps | 96% |
| ADI AR 2206H | <<locked>> | 80% | 50,009 psi | 77% | 2802 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 42,453 psi | 65% | 2651 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 45,513 psi | 70% | 2785 fps | 95.1% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,156 psi | 80% | 2802 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 53,374 psi | 82% | 2772 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,282 psi | 71% | 2854 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,453 psi | 65% | 2674 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 45,513 psi | 70% | 2740 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,793 psi | 50% | 2526 fps | 96.2% |
| Alliant Reloder-17 | 50 gr | 80% | 36,927 psi | 57% | 2657 fps | 99% |
| Alliant Reloder-19 | <<locked>> | 94% | 44,831 psi | 69% | 2776 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,020 psi | 69% | 2825 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 86% | 28,776 psi | 44% | 2438 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 96% | 34,737 psi | 53% | 2608 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 88% | 33,170 psi | 51% | 2618 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,632 psi | 76% | 2815 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 42,322 psi | 65% | 2677 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 45,020 psi | 69% | 2825 fps | 95.3% |
| Bofors RP7 | <<locked>> | 84% | 42,772 psi | 66% | 2654 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,635 psi | 83% | 2785 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,634 psi | 79% | 2828 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,946 psi | 66% | 2687 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 82% | 41,176 psi | 63% | 2700 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 88% | 45,484 psi | 70% | 2743 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 50,517 psi | 78% | 2812 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,211 psi | 46% | 2425 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,135 psi | 68% | 2740 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 42,569 psi | 66% | 2756 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 41% | 1594 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,744 psi | 69% | 2697 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 46,630 psi | 72% | 2730 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,481 psi | 64% | 2625 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,147 psi | 63% | 2595 fps | 95.8% |
| IMR 4350 | <<locked>> | 86% | 40,828 psi | 63% | 2635 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,218 psi | 60% | 2579 fps | 95.1% |
| IMR 4831 | <<locked>> | 82% | 30,850 psi | 47% | 2441 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 46,688 psi | 72% | 2769 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 52,156 psi | 80% | 2802 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,588 psi | 76% | 2772 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,414 psi | 76% | 2733 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,585 psi | 69% | 2684 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,680 psi | 56% | 2530 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 39,508 psi | 61% | 2612 fps | 95.6% |
| Lovex S071 | <<locked>> | 98% | 36,883 psi | 57% | 2589 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 48,863 psi | 75% | 2749 fps | 100% |
| Norma 202 | <<locked>> | 80% | 49,342 psi | 76% | 2749 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,889 psi | 69% | 2726 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 46,325 psi | 71% | 2782 fps | 95.3% |
| Norma MRP | <<locked>> | 94% | 41,321 psi | 64% | 2779 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 33,228 psi | 51% | 2516 fps | 96% |
| Ramshot Big Game | <<locked>> | 80% | 44,962 psi | 69% | 2746 fps | 99.6% |
| Ramshot Grand | <<locked>> | 98% | 50,575 psi | 78% | 2927 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 84% | 36,912 psi | 57% | 2615 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 98% | 43,424 psi | 67% | 2769 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 52,054 psi | 80% | 2822 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,185 psi | 80% | 2841 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 42% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,250 psi | 67% | 2671 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,733 psi | 75% | 2854 fps | 99.8% |
| ReloadSwiss RS 60 | 50 gr | 80% | 39,334 psi | 61% | 2720 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,735 psi | 50% | 2530 fps | 95.6% |
| ReloadSwiss RS 70 | 52.1 gr | 82% | 34,751 psi | 53% | 2595 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 52,649 psi | 81% | 2776 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,398 psi | 71% | 2700 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,856 psi | 61% | 2625 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 50,372 psi | 78% | 2822 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 94% | 43,729 psi | 67% | 2756 fps | 95% |
| Rottweil R 907 | <<locked>> | 84% | 42,772 psi | 66% | 2654 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,680 psi | 56% | 2530 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,588 psi | 76% | 2772 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,585 psi | 69% | 2684 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 39,508 psi | 61% | 2612 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,944 psi | 63% | 2674 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,749 psi | 78% | 2802 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,356 psi | 74% | 2769 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,908 psi | 77% | 2687 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,887 psi | 64% | 2556 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 38,334 psi | 59% | 2523 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 46,383 psi | 71% | 2808 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 49,661 psi | 76% | 2690 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,459 psi | 78% | 2789 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 40,524 psi | 62% | 2628 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 29,617 psi | 46% | 2464 fps | 98.1% |
| Somchem S385 | <<locked>> | 92% | 41,437 psi | 64% | 2680 fps | 95.3% |
| Unknown powder | <<locked>> | 80% | 36,013 psi | 55% | 2575 fps | 96.3% |
| Vihtavuori N133 | <<locked>> | 80% | 50,444 psi | 78% | 2677 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 46,398 psi | 71% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,876 psi | 72% | 2684 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,609 psi | 59% | 2562 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 34,592 psi | 53% | 2520 fps | 96.5% |
| Vihtavuori N165 | <<locked>> | 98% | 43,627 psi | 67% | 2710 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 52,402 psi | 81% | 2799 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,078 psi | 69% | 2674 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,982 psi | 52% | 2516 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 29,269 psi | 45% | 2457 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,011 psi | 52% | 2493 fps | 98.4% |
| Winchester 760 | <<locked>> | 82% | 41,176 psi | 63% | 2700 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,035 psi | 42% | 2457 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,716 psi | 70% | 2753 fps | 95.2% |
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 119 powders for .280 Ackley Improved loaded with the .284 | 145gr | Hasler Hunting. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,041 fps; across all powders the maximum-charge window runs from 1,785 fps to 3,041 fps. Accurate 3100 gives the best case fill at 100 %, and 119 of the 119 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 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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. Alliant Reloder-17, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .280 Ackley Improved with the .284 | 145gr | Hasler Hunting they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.