Load Specifications
Bullet Manufacturer:Warner Tool Co
Bullet Weight:151 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 | 151gr | Warner Tool Co. Flat Line bullet and 105 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 H414.
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% | 58,247 psi | 90% | 2730 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 57,798 psi | 89% | 2759 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,188 psi | 86% | 2782 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,718 psi | 75% | 2753 fps | 98.7% |
| Accurate 4064 | <<locked>> | 88% | 58,233 psi | 90% | 2815 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 58,624 psi | 90% | 2920 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 57,595 psi | 89% | 2848 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 58,552 psi | 90% | 2848 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 56,028 psi | 86% | 2900 fps | 97.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,086 psi | 86% | 2789 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 57,943 psi | 89% | 2759 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,783 psi | 89% | 2972 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,492 psi | 85% | 2818 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,941 psi | 86% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,622 psi | 86% | 2920 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,942 psi | 88% | 2949 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,998 psi | 85% | 2887 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,530 psi | 75% | 2825 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,934 psi | 71% | 2776 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,176 psi | 62% | 2684 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,214 psi | 80% | 2959 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,406 psi | 88% | 2864 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 56,434 psi | 87% | 2838 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,530 psi | 75% | 2825 fps | 96.5% |
| Bofors RP7 | <<locked>> | 92% | 56,057 psi | 86% | 2818 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,479 psi | 88% | 2769 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,086 psi | 86% | 2825 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,174 psi | 88% | 2858 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 57,334 psi | 88% | 2917 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 92% | 57,290 psi | 88% | 2874 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 84% | 58,204 psi | 90% | 2854 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,637 psi | 86% | 2841 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 58,218 psi | 90% | 2890 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,638 psi | 89% | 2956 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 56% | 1732 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,593 psi | 86% | 2802 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,494 psi | 90% | 2825 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 58,117 psi | 89% | 2831 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 57,479 psi | 88% | 2815 fps | 99.1% |
| IMR 4350 | <<locked>> | 96% | 56,536 psi | 87% | 2844 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,653 psi | 89% | 2844 fps | 99.1% |
| IMR 4831 | <<locked>> | 96% | 55,317 psi | 85% | 2858 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 57,377 psi | 88% | 2871 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,666 psi | 86% | 2831 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 82% | 56,086 psi | 86% | 2789 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 57,740 psi | 89% | 2818 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,550 psi | 87% | 2769 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 58,160 psi | 89% | 2825 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 57,435 psi | 88% | 2838 fps | 99.7% |
| Lovex S070 | <<locked>> | 96% | 58,639 psi | 90% | 2881 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,509 psi | 62% | 2605 fps | 97% |
| Norma 201 | <<locked>> | 84% | 56,115 psi | 86% | 2789 fps | 100% |
| Norma 202 | <<locked>> | 84% | 56,855 psi | 87% | 2785 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,187 psi | 85% | 2828 fps | 100% |
| Norma 204 | <<locked>> | 96% | 57,392 psi | 88% | 2900 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 51,503 psi | 79% | 2913 fps | 98.5% |
| Norma URP | <<locked>> | 96% | 57,130 psi | 88% | 2900 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,854 psi | 86% | 2854 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,898 psi | 86% | 2904 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 56,347 psi | 87% | 2818 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,202 psi | 86% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,840 psi | 57% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,101 psi | 88% | 2838 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 56,753 psi | 87% | 2910 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,579 psi | 87% | 2943 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 58,595 psi | 90% | 2946 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 57,145 psi | 88% | 2972 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 57,087 psi | 88% | 2766 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 56,637 psi | 87% | 2785 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,246 psi | 87% | 2828 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 57,841 psi | 89% | 2871 fps | 97% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 54,230 psi | 83% | 2874 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 92% | 56,057 psi | 86% | 2818 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 57,435 psi | 88% | 2838 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 57,740 psi | 89% | 2818 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 58,160 psi | 89% | 2825 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 58,639 psi | 90% | 2881 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 58,160 psi | 89% | 2890 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,940 psi | 85% | 2795 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,796 psi | 86% | 2815 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,363 psi | 88% | 2720 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,870 psi | 89% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 57,566 psi | 89% | 2795 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,737 psi | 83% | 2871 fps | 97.6% |
| Somchem S335 | <<locked>> | 84% | 56,724 psi | 87% | 2717 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 58,421 psi | 90% | 2835 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,478 psi | 87% | 2828 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 56,144 psi | 86% | 2904 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,810 psi | 84% | 2851 fps | 98.4% |
| Vihtavuori N133 | <<locked>> | 84% | 57,783 psi | 89% | 2703 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 56,797 psi | 87% | 2746 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,508 psi | 88% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,928 psi | 89% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,999 psi | 86% | 2848 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,297 psi | 73% | 2713 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 82% | 56,579 psi | 87% | 2789 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 55,579 psi | 86% | 2762 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 58,552 psi | 90% | 2904 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 51,242 psi | 79% | 2851 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,796 psi | 86% | 2818 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,159 psi | 88% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 57,653 psi | 89% | 2923 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,307 psi | 64% | 2815 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,043 psi | 86% | 2825 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,430 psi | 79% | 2789 fps | 96.8% |
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% | 54,766 psi | 84% | 2684 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,819 psi | 74% | 2625 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,108 psi | 71% | 2615 fps | 96.5% |
| Accurate 3100 | <<locked>> | 90% | 34,679 psi | 53% | 2477 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 45,252 psi | 70% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,953 psi | 52% | 2477 fps | 96.7% |
| ADI AR 2206H | <<locked>> | 80% | 50,778 psi | 78% | 2743 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,004 psi | 66% | 2595 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 46,180 psi | 71% | 2733 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,823 psi | 81% | 2743 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,302 psi | 84% | 2713 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,007 psi | 72% | 2799 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,178 psi | 66% | 2618 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,311 psi | 71% | 2687 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,649 psi | 52% | 2487 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 37,681 psi | 58% | 2612 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 45,571 psi | 70% | 2723 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 45,585 psi | 70% | 2769 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,717 psi | 43% | 2349 fps | 95.8% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,404 psi | 54% | 2569 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 86% | 31,691 psi | 49% | 2516 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,386 psi | 78% | 2756 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 43,381 psi | 67% | 2631 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 45,585 psi | 70% | 2769 fps | 95.7% |
| Bofors RP7 | <<locked>> | 82% | 41,118 psi | 63% | 2552 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,201 psi | 83% | 2723 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,504 psi | 81% | 2769 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,932 psi | 68% | 2638 fps | 98.7% |
| Hodgdon H414 | 48.1 gr | 82% | 38,392 psi | 59% | 2575 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 44,469 psi | 68% | 2654 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 51,300 psi | 79% | 2753 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,096 psi | 48% | 2388 fps | 97.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,616 psi | 73% | 2733 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 40,350 psi | 62% | 2648 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,890 psi | 41% | 1545 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,950 psi | 75% | 2700 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,517 psi | 79% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,223 psi | 70% | 2628 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,543 psi | 73% | 2654 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 41,365 psi | 64% | 2582 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,842 psi | 61% | 2530 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 32,837 psi | 51% | 2434 fps | 96.4% |
| IMR 4895 | <<locked>> | 80% | 47,500 psi | 73% | 2717 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 52,388 psi | 81% | 2779 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 52,823 psi | 81% | 2743 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,734 psi | 78% | 2720 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,879 psi | 77% | 2671 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,353 psi | 70% | 2628 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,478 psi | 58% | 2484 fps | 96.4% |
| Lovex S070 | <<locked>> | 82% | 37,971 psi | 58% | 2510 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 35,534 psi | 55% | 2497 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 49,690 psi | 76% | 2690 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,067 psi | 77% | 2690 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,687 psi | 70% | 2674 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 46,992 psi | 72% | 2726 fps | 95.7% |
| Norma MRP | <<locked>> | 92% | 39,117 psi | 60% | 2667 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 34,011 psi | 52% | 2474 fps | 96.6% |
| Ramshot Big Game | <<locked>> | 80% | 45,701 psi | 70% | 2694 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 35,360 psi | 54% | 2513 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 52,852 psi | 81% | 2762 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,678 psi | 81% | 2779 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 42% | 1585 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 43,961 psi | 68% | 2618 fps | 97.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,676 psi | 76% | 2799 fps | 99.9% |
| ReloadSwiss RS 60 | 48 gr | 80% | 40,089 psi | 62% | 2667 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,649 psi | 52% | 2490 fps | 96.2% |
| ReloadSwiss RS 70 | 48.8 gr | 80% | 33,170 psi | 51% | 2493 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 53,795 psi | 83% | 2720 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,195 psi | 73% | 2641 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,843 psi | 63% | 2575 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 96% | 51,097 psi | 79% | 2766 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 94% | 44,469 psi | 68% | 2707 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 82% | 41,118 psi | 63% | 2552 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,478 psi | 58% | 2484 fps | 96.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,734 psi | 78% | 2720 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,353 psi | 70% | 2628 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 37,971 psi | 58% | 2510 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,872 psi | 64% | 2628 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,401 psi | 79% | 2740 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,240 psi | 76% | 2713 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,647 psi | 78% | 2628 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,583 psi | 66% | 2500 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,044 psi | 60% | 2477 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,048 psi | 68% | 2700 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 50,343 psi | 77% | 2628 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,242 psi | 79% | 2733 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,336 psi | 64% | 2579 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 30,516 psi | 47% | 2428 fps | 98.6% |
| Somchem S385 | <<locked>> | 92% | 42,264 psi | 65% | 2635 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 51,111 psi | 79% | 2615 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,282 psi | 73% | 2612 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,601 psi | 73% | 2625 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,421 psi | 61% | 2513 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 35,418 psi | 54% | 2474 fps | 97% |
| Vihtavuori N165 | <<locked>> | 96% | 41,481 psi | 64% | 2605 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 53,156 psi | 82% | 2740 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 45,948 psi | 71% | 2618 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,911 psi | 54% | 2477 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 82% | 28,253 psi | 43% | 2369 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,838 psi | 54% | 2451 fps | 98.8% |
| Winchester 748 | <<locked>> | 80% | 53,447 psi | 82% | 2785 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 38,609 psi | 59% | 2579 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 86% | 26,092 psi | 40% | 2369 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,081 psi | 76% | 2720 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 44,875 psi | 69% | 2674 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 | 151gr | Warner Tool Co. Flat Line. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,972 fps; across all powders the maximum-charge window runs from 1,732 fps to 2,972 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 56–90 %, leaving at least 10 % headroom. The 151.0 gr projectile in 0.284" calls for a 1:8.5 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. ReloadSwiss RS 60, ReloadSwiss RS 70, Hodgdon H414 rank at the top here: for .280 Ackley Improved with the .284 | 151gr | Warner Tool Co. Flat Line they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Hodgdon H1000 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.