Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 150gr | Nosler Partition bullet and 104 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon H4831 SC, 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.
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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 2495 | <<locked>> | 84% | 57,595 psi | 89% | 2782 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,434 psi | 85% | 2802 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,707 psi | 81% | 2841 fps | 99.4% |
| Accurate 4064 | <<locked>> | 86% | 57,928 psi | 89% | 2838 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,259 psi | 85% | 2897 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 56,855 psi | 87% | 2864 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,044 psi | 89% | 2871 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,130 psi | 86% | 2936 fps | 98.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,751 psi | 83% | 2923 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,624 psi | 89% | 2999 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,332 psi | 85% | 2841 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,753 psi | 86% | 2867 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,883 psi | 86% | 2949 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,174 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,303 psi | 85% | 2923 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,460 psi | 81% | 2920 fps | 97.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,501 psi | 76% | 2858 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,192 psi | 66% | 2779 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,000 psi | 88% | 3054 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,087 psi | 88% | 2887 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,196 psi | 74% | 2844 fps | 96.7% |
| Bofors RP3 | <<locked>> | 86% | 56,391 psi | 87% | 2864 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,460 psi | 81% | 2920 fps | 97.7% |
| Bofors RP7 | <<locked>> | 90% | 55,608 psi | 86% | 2844 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 86% | 56,623 psi | 87% | 2877 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 57,305 psi | 88% | 2946 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 90% | 57,072 psi | 88% | 2904 fps | 98.5% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,667 psi | 89% | 2930 fps | 96.6% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,391 psi | 87% | 2913 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 82% | 57,479 psi | 88% | 2874 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,173 psi | 86% | 2874 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,131 psi | 89% | 2913 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,914 psi | 89% | 2989 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 56% | 1768 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 58,682 psi | 90% | 2874 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 58,523 psi | 90% | 2851 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,464 psi | 88% | 2854 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,898 psi | 88% | 2841 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 56,623 psi | 87% | 2877 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,363 psi | 88% | 2874 fps | 99.3% |
| IMR 4831 | <<locked>> | 94% | 55,477 psi | 85% | 2887 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,232 psi | 88% | 2897 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,579 psi | 86% | 2861 fps | 96.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,155 psi | 79% | 2894 fps | 95.9% |
| Lovex D073.6 | <<locked>> | 82% | 57,609 psi | 89% | 2841 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,767 psi | 86% | 2792 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,928 psi | 89% | 2848 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,217 psi | 88% | 2867 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 55,056 psi | 85% | 2854 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,845 psi | 67% | 2690 fps | 98.1% |
| Norma 201 | <<locked>> | 82% | 55,550 psi | 85% | 2805 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,318 psi | 87% | 2802 fps | 100% |
| Norma 203B | <<locked>> | 86% | 58,537 psi | 90% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,566 psi | 89% | 2933 fps | 98.2% |
| Norma MRPᴾ | <<locked>> | 100% | 55,767 psi | 86% | 3009 fps | 99.3% |
| Norma URP | <<locked>> | 94% | 57,580 psi | 89% | 2933 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,637 psi | 86% | 2877 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,517 psi | 79% | 2910 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 94% | 56,362 psi | 87% | 2936 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,716 psi | 70% | 2779 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,014 psi | 57% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,594 psi | 87% | 2861 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,753 psi | 87% | 2936 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,637 psi | 87% | 2966 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 58,726 psi | 90% | 2972 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,261 psi | 88% | 3002 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,177 psi | 65% | 2795 fps | 96.7% |
| Rottweil R 902 | <<locked>> | 84% | 56,260 psi | 87% | 2808 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,289 psi | 87% | 2858 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,972 psi | 89% | 2907 fps | 97.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 58,363 psi | 90% | 2966 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 90% | 55,608 psi | 86% | 2844 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,217 psi | 88% | 2867 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,609 psi | 89% | 2841 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,928 psi | 89% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,056 psi | 85% | 2854 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,073 psi | 89% | 2920 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 58,349 psi | 90% | 2874 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,477 psi | 85% | 2838 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,405 psi | 87% | 2736 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,435 psi | 88% | 2740 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,261 psi | 88% | 2822 fps | 99.3% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,856 psi | 89% | 2963 fps | 98.6% |
| Somchem S335 | <<locked>> | 82% | 56,028 psi | 86% | 2736 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,131 psi | 89% | 2861 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,144 psi | 86% | 2848 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,985 psi | 86% | 2844 fps | 96.2% |
| Somchem S365 | <<locked>> | 96% | 56,724 psi | 87% | 2933 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,332 psi | 85% | 2887 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 82% | 56,942 psi | 88% | 2720 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,739 psi | 87% | 2769 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,971 psi | 88% | 2785 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,522 psi | 88% | 2825 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,130 psi | 86% | 2877 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,836 psi | 78% | 2802 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 86% | 58,610 psi | 90% | 2828 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 58,682 psi | 90% | 2930 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,361 psi | 85% | 2936 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,144 psi | 86% | 2995 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,550 psi | 85% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,624 psi | 89% | 2949 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,657 psi | 69% | 2913 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,622 psi | 86% | 2848 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,317 psi | 85% | 2877 fps | 97.9% |
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 2495 | <<locked>> | 80% | 50,923 psi | 78% | 2690 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,486 psi | 75% | 2687 fps | 97.4% |
| Accurate 3100 | <<locked>> | 88% | 35,099 psi | 54% | 2507 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 48,254 psi | 74% | 2697 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,506 psi | 56% | 2556 fps | 97.8% |
| ADI AR 2206H | <<locked>> | 80% | 53,447 psi | 82% | 2815 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,498 psi | 70% | 2667 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,192 psi | 66% | 2703 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 98% | 50,343 psi | 77% | 2864 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,024 psi | 77% | 2881 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,861 psi | 71% | 2690 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,994 psi | 75% | 2759 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,665 psi | 55% | 2562 fps | 97.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,350 psi | 62% | 2690 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,757 psi | 66% | 2697 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,004 psi | 66% | 2746 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,237 psi | 40% | 2320 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,518 psi | 52% | 2543 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 84% | 31,908 psi | 49% | 2543 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,185 psi | 82% | 2828 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 42,380 psi | 65% | 2730 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 46,050 psi | 71% | 2700 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,004 psi | 66% | 2746 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 40,683 psi | 63% | 2572 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 46,601 psi | 72% | 2713 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 38,508 psi | 59% | 2602 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 41,350 psi | 64% | 2621 fps | 95% |
| Hodgdon H4831 | <<locked>> | 98% | 53,998 psi | 83% | 2871 fps | 95.8% |
| Hodgdon H4831 SC | 60.6 gr | 98% | 52,837 psi | 81% | 2854 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 54,027 psi | 83% | 2822 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,199 psi | 51% | 2461 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,734 psi | 78% | 2805 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,219 psi | 62% | 2671 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,195 psi | 42% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,822 psi | 80% | 2776 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,868 psi | 84% | 2802 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,848 psi | 74% | 2700 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,082 psi | 77% | 2730 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 38,885 psi | 60% | 2556 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,047 psi | 65% | 2602 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 35,172 psi | 54% | 2510 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 50,212 psi | 77% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,286 psi | 80% | 2808 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 98% | 47,935 psi | 74% | 2835 fps | 95% |
| Lovex D073.6 | <<locked>> | 80% | 53,809 psi | 83% | 2789 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,489 psi | 81% | 2740 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,051 psi | 74% | 2700 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,769 psi | 61% | 2556 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 37,942 psi | 58% | 2536 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 33,953 psi | 52% | 2480 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 52,475 psi | 81% | 2759 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,881 psi | 81% | 2756 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,356 psi | 74% | 2746 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,816 psi | 67% | 2694 fps | 95.2% |
| Norma MRP | <<locked>> | 90% | 39,436 psi | 61% | 2697 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,405 psi | 56% | 2552 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 48,617 psi | 75% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 47,877 psi | 74% | 2841 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 35,244 psi | 54% | 2536 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 98% | 42,482 psi | 65% | 2717 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1617 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,659 psi | 72% | 2697 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,924 psi | 81% | 2877 fps | 100% |
| ReloadSwiss RS 60 | 51.3 gr | 80% | 42,873 psi | 66% | 2746 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,303 psi | 56% | 2572 fps | 97.4% |
| ReloadSwiss RS 70 | 52.1 gr | 80% | 35,302 psi | 54% | 2572 fps | 96.6% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,349 psi | 61% | 2726 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 49,951 psi | 77% | 2713 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,497 psi | 67% | 2651 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 47,921 psi | 74% | 2743 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 41,814 psi | 64% | 2677 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 40,683 psi | 63% | 2572 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,769 psi | 61% | 2556 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,809 psi | 83% | 2789 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,051 psi | 74% | 2700 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,942 psi | 58% | 2536 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,498 psi | 68% | 2700 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 54,563 psi | 84% | 2818 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,924 psi | 80% | 2785 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,229 psi | 82% | 2694 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,976 psi | 69% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,740 psi | 60% | 2497 fps | 95.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,251 psi | 68% | 2730 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 52,997 psi | 82% | 2694 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,099 psi | 83% | 2805 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,918 psi | 68% | 2651 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 52,373 psi | 81% | 2785 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 32,938 psi | 51% | 2510 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 39,885 psi | 61% | 2608 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 53,780 psi | 83% | 2680 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,154 psi | 77% | 2680 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,285 psi | 77% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,858 psi | 64% | 2582 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,753 psi | 58% | 2552 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 41,843 psi | 64% | 2638 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 48,559 psi | 75% | 2684 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,289 psi | 57% | 2552 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 28,732 psi | 44% | 2395 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 96% | 49,139 psi | 76% | 2874 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,898 psi | 57% | 2523 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 38,508 psi | 59% | 2602 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,208 psi | 40% | 2398 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,040 psi | 80% | 2795 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,976 psi | 69% | 2703 fps | 95.7% |
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 111 powders for .280 Ackley Improved loaded with the .284 | 150gr | Nosler Partition. Alliant Reloder-26 delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,768 fps to 3,054 fps. Accurate 3100 gives the best case fill at 100 %, and 111 of the 111 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. Hodgdon H4831 SC, ReloadSwiss RS 60, ReloadSwiss RS 70 rank at the top here: for .280 Ackley Improved with the .284 | 150gr | Nosler Partition they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, Baschieri & Pellagri 109, Bofors RP30 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.