Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 150gr | Rhino Solid Shank 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 70, Alliant Reloder-26 and Alliant Reloder-16.
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 2495 | <<locked>> | 84% | 58,392 psi | 90% | 2795 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,970 psi | 86% | 2815 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,577 psi | 82% | 2858 fps | 99.5% |
| Accurate 4064 | <<locked>> | 86% | 58,711 psi | 90% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,956 psi | 86% | 2910 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,622 psi | 86% | 2992 fps | 96% |
| ADI AR 2206H | <<locked>> | 82% | 57,537 psi | 89% | 2877 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,653 psi | 90% | 2884 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,652 psi | 87% | 2946 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,462 psi | 84% | 2943 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 58,305 psi | 90% | 3012 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,028 psi | 86% | 2858 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,173 psi | 86% | 2877 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,507 psi | 87% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,885 psi | 89% | 2986 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,072 psi | 86% | 2936 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,272 psi | 82% | 2940 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,372 psi | 77% | 2874 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,859 psi | 67% | 2795 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,899 psi | 89% | 3071 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,421 psi | 88% | 2897 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,718 psi | 75% | 2858 fps | 96.9% |
| Bofors RP3 | <<locked>> | 86% | 56,797 psi | 87% | 2871 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,272 psi | 82% | 2940 fps | 98% |
| Bofors RP7 | <<locked>> | 90% | 56,217 psi | 86% | 2858 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 86% | 57,232 psi | 88% | 2890 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 57,899 psi | 89% | 2959 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 57,653 psi | 89% | 2917 fps | 98.7% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 58,450 psi | 90% | 2946 fps | 96.8% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,217 psi | 88% | 2927 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 82% | 58,204 psi | 90% | 2887 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,826 psi | 87% | 2884 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,508 psi | 90% | 2923 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 58,465 psi | 90% | 2999 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,332 psi | 56% | 1775 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,535 psi | 85% | 2835 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 58,160 psi | 89% | 2864 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,232 psi | 88% | 2848 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 57,174 psi | 88% | 2890 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,943 psi | 89% | 2887 fps | 99.4% |
| IMR 4831 | <<locked>> | 94% | 56,130 psi | 86% | 2897 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,609 psi | 89% | 2904 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,057 psi | 86% | 2874 fps | 96.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,866 psi | 80% | 2910 fps | 96.2% |
| Lovex D073.6 | <<locked>> | 82% | 58,044 psi | 89% | 2851 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,173 psi | 86% | 2799 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 58,320 psi | 90% | 2858 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,812 psi | 89% | 2877 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 55,637 psi | 86% | 2867 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,382 psi | 68% | 2703 fps | 98.3% |
| Norma 201 | <<locked>> | 82% | 56,260 psi | 87% | 2822 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,043 psi | 88% | 2818 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,463 psi | 85% | 2861 fps | 100% |
| Norma 204 | <<locked>> | 94% | 58,117 psi | 89% | 2946 fps | 98.3% |
| Norma MRPᴾ | <<locked>> | 100% | 56,608 psi | 87% | 3025 fps | 99.4% |
| Norma URP | <<locked>> | 94% | 58,189 psi | 90% | 2946 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,275 psi | 87% | 2890 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,199 psi | 80% | 2927 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 94% | 56,884 psi | 88% | 2946 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,354 psi | 71% | 2795 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,999 psi | 57% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,188 psi | 88% | 2874 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,217 psi | 88% | 2946 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,653 psi | 89% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,695 psi | 86% | 2930 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 58,073 psi | 89% | 3015 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,714 psi | 66% | 2812 fps | 97% |
| Rottweil R 902 | <<locked>> | 84% | 56,971 psi | 88% | 2822 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,942 psi | 88% | 2867 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 58,436 psi | 90% | 2917 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 98% | 55,230 psi | 85% | 2920 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 56,217 psi | 86% | 2858 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,812 psi | 89% | 2877 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 58,044 psi | 89% | 2851 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 58,320 psi | 90% | 2858 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,637 psi | 86% | 2867 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,697 psi | 90% | 2930 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,811 psi | 86% | 2848 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,884 psi | 88% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,798 psi | 89% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,783 psi | 89% | 2835 fps | 99.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,436 psi | 90% | 2972 fps | 98.7% |
| Somchem S335 | <<locked>> | 82% | 56,710 psi | 87% | 2746 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,465 psi | 90% | 2867 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,782 psi | 87% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,710 psi | 87% | 2858 fps | 96.4% |
| Somchem S365 | <<locked>> | 96% | 57,377 psi | 88% | 2946 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,869 psi | 86% | 2897 fps | 98.9% |
| Vihtavuori N133 | <<locked>> | 82% | 57,377 psi | 88% | 2726 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,246 psi | 88% | 2776 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,624 psi | 89% | 2795 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 58,160 psi | 89% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,739 psi | 87% | 2887 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,605 psi | 79% | 2818 fps | 98% |
| Vihtavuori N540 | <<locked>> | 84% | 55,521 psi | 85% | 2789 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,724 psi | 86% | 2890 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,289 psi | 87% | 2949 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,942 psi | 88% | 3012 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,362 psi | 87% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 58,189 psi | 90% | 2963 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,368 psi | 70% | 2930 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,985 psi | 86% | 2854 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,144 psi | 86% | 2894 fps | 98.1% |
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% | 51,445 psi | 79% | 2700 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,066 psi | 75% | 2703 fps | 97.6% |
| Accurate 3100 | <<locked>> | 88% | 35,650 psi | 55% | 2523 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 48,718 psi | 75% | 2707 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,898 psi | 57% | 2566 fps | 97.9% |
| Accurate MAGPRO | <<locked>> | 98% | 51,880 psi | 80% | 2930 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 53,882 psi | 83% | 2822 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,919 psi | 71% | 2680 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 43,671 psi | 67% | 2717 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 98% | 50,821 psi | 78% | 2877 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,720 psi | 78% | 2894 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,282 psi | 71% | 2700 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,371 psi | 76% | 2769 fps | 100% |
| Alliant Reloder-16 | 48.2 gr | 80% | 36,201 psi | 56% | 2579 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,944 psi | 63% | 2703 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 43,279 psi | 67% | 2710 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,497 psi | 67% | 2759 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,513 psi | 41% | 2333 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,084 psi | 52% | 2562 fps | 95.8% |
| Alliant Reloder-26 | 55.8 gr | 84% | 32,358 psi | 50% | 2559 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,838 psi | 83% | 2841 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 42,888 psi | 66% | 2743 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,731 psi | 72% | 2713 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,497 psi | 67% | 2759 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 41,060 psi | 63% | 2585 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 46,992 psi | 72% | 2723 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 38,870 psi | 60% | 2612 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 80% | 41,974 psi | 65% | 2638 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 96% | 51,068 psi | 79% | 2828 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,330 psi | 82% | 2864 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 80% | 54,476 psi | 84% | 2831 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,591 psi | 52% | 2470 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,445 psi | 79% | 2822 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,756 psi | 63% | 2684 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,282 psi | 42% | 1588 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,214 psi | 80% | 2785 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,254 psi | 74% | 2713 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,430 psi | 78% | 2740 fps | 98.5% |
| IMR 4350 | <<locked>> | 82% | 39,218 psi | 60% | 2566 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,612 psi | 66% | 2618 fps | 96.8% |
| IMR 4831 | <<locked>> | 80% | 35,563 psi | 55% | 2520 fps | 97.6% |
| IMR 4895 | <<locked>> | 80% | 50,662 psi | 78% | 2799 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 49,632 psi | 76% | 2766 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 98% | 48,356 psi | 74% | 2844 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 80% | 54,520 psi | 84% | 2802 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,895 psi | 81% | 2749 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,515 psi | 75% | 2710 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,132 psi | 62% | 2569 fps | 97.5% |
| Lovex S070 | <<locked>> | 80% | 38,290 psi | 59% | 2546 fps | 95.9% |
| Lovex S071 | <<locked>> | 92% | 34,461 psi | 53% | 2493 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,881 psi | 81% | 2772 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,330 psi | 82% | 2766 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,762 psi | 75% | 2756 fps | 100% |
| Norma 204 | <<locked>> | 86% | 44,353 psi | 68% | 2710 fps | 95.4% |
| Norma MRP | <<locked>> | 88% | 37,463 psi | 58% | 2654 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,811 psi | 57% | 2562 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 49,255 psi | 76% | 2782 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 48,559 psi | 75% | 2861 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 35,766 psi | 55% | 2549 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 96% | 40,118 psi | 62% | 2671 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,731 psi | 43% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,963 psi | 72% | 2707 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,650 psi | 83% | 2890 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,526 psi | 67% | 2759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,680 psi | 56% | 2582 fps | 97.6% |
| ReloadSwiss RS 70 | 52.7 gr | 80% | 35,781 psi | 55% | 2589 fps | 96.9% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,900 psi | 61% | 2743 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 50,372 psi | 77% | 2723 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,918 psi | 68% | 2661 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 48,443 psi | 75% | 2753 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 90% | 42,380 psi | 65% | 2694 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 41,060 psi | 63% | 2585 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,132 psi | 62% | 2569 fps | 97.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,520 psi | 84% | 2802 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,515 psi | 75% | 2710 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,290 psi | 59% | 2546 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,150 psi | 69% | 2717 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,576 psi | 81% | 2799 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,679 psi | 83% | 2703 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,382 psi | 70% | 2572 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,320 psi | 60% | 2513 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 41,989 psi | 65% | 2687 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 53,403 psi | 82% | 2700 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,723 psi | 84% | 2815 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,353 psi | 68% | 2661 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 53,113 psi | 82% | 2802 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 33,315 psi | 51% | 2523 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 40,364 psi | 62% | 2621 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 80% | 54,230 psi | 83% | 2687 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,647 psi | 78% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,676 psi | 78% | 2700 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,264 psi | 65% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,130 psi | 59% | 2562 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 92% | 39,726 psi | 61% | 2598 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 48,965 psi | 75% | 2694 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,652 psi | 58% | 2562 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 29,124 psi | 45% | 2408 fps | 95.7% |
| Vihtavuori N560 | <<locked>> | 96% | 49,632 psi | 76% | 2887 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,347 psi | 57% | 2533 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 39,073 psi | 60% | 2615 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 84% | 26,600 psi | 41% | 2415 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,402 psi | 81% | 2802 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 42,598 psi | 66% | 2661 fps | 95.1% |
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 110 powders for .280 Ackley Improved loaded with the .284 | 150gr | Rhino Solid Shank. Alliant Reloder-26 delivers the highest muzzle velocity at 3,071 fps; across all powders the maximum-charge window runs from 1,775 fps to 3,071 fps. Accurate 3100 gives the best case fill at 100 %, and 110 of the 110 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:12.5 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. ReloadSwiss RS 70, Alliant Reloder-26, Alliant Reloder-16 rank at the top here: for .280 Ackley Improved with the .284 | 150gr | Rhino Solid Shank they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.