Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 162gr | RWS Kegelspitz bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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>> | 82% | 58,566 psi | 90% | 2690 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,593 psi | 86% | 2720 fps | 99.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 58,175 psi | 89% | 2825 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,463 psi | 85% | 2700 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,202 psi | 86% | 2812 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,521 psi | 87% | 2913 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 86% | 58,523 psi | 90% | 2779 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,188 psi | 88% | 2861 fps | 99% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 58,320 psi | 90% | 2913 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,695 psi | 58% | 2582 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 58,523 psi | 90% | 2907 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,290 psi | 88% | 2858 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,290 psi | 88% | 2858 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,130 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,246 psi | 87% | 2776 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,985 psi | 88% | 2864 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 58,552 psi | 90% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,507 psi | 87% | 2851 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,580 psi | 89% | 2907 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,636 psi | 84% | 2831 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,253 psi | 73% | 2772 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,013 psi | 85% | 2923 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,910 psi | 81% | 2835 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 57,029 psi | 88% | 2772 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,580 psi | 89% | 2907 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 56,115 psi | 86% | 2762 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,978 psi | 72% | 2717 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 84% | 57,058 psi | 88% | 2789 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 58,305 psi | 90% | 2864 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 57,754 psi | 89% | 2825 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 98% | 58,697 psi | 90% | 2861 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,464 psi | 88% | 2841 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,246 psi | 88% | 2789 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 58,465 psi | 90% | 2818 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,369 psi | 71% | 2815 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 88% | 54,868 psi | 84% | 2851 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,724 psi | 56% | 1716 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,001 psi | 89% | 2762 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,927 psi | 88% | 2749 fps | 99.7% |
| IMR 4350 | <<locked>> | 92% | 57,290 psi | 88% | 2799 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,537 psi | 89% | 2785 fps | 99.7% |
| IMR 4831 | <<locked>> | 92% | 56,594 psi | 87% | 2802 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,711 psi | 89% | 2802 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,376 psi | 87% | 2789 fps | 97.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,767 psi | 86% | 2887 fps | 98% |
| Lovex S062 | <<locked>> | 84% | 58,276 psi | 90% | 2756 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,827 psi | 89% | 2782 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,796 psi | 86% | 2776 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,385 psi | 74% | 2680 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 55,535 psi | 85% | 2762 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,363 psi | 90% | 2854 fps | 99% |
| Norma MRP | <<locked>> | 98% | 57,580 psi | 89% | 2936 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 58,552 psi | 90% | 2848 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,304 psi | 87% | 2789 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,391 psi | 87% | 2907 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 92% | 57,377 psi | 88% | 2854 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,488 psi | 78% | 2785 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,434 psi | 58% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,913 psi | 88% | 2776 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,001 psi | 89% | 2877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,086 psi | 86% | 2835 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 58,334 psi | 90% | 2917 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,412 psi | 71% | 2812 fps | 99% |
| Rottweil R 902 | <<locked>> | 82% | 56,579 psi | 87% | 2717 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,203 psi | 88% | 2769 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 58,552 psi | 90% | 2828 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 96% | 55,738 psi | 86% | 2835 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 56,115 psi | 86% | 2762 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,827 psi | 89% | 2782 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 58,276 psi | 90% | 2756 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,796 psi | 86% | 2776 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 58,653 psi | 90% | 2825 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,493 psi | 88% | 2644 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,638 psi | 89% | 2740 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,259 psi | 85% | 2831 fps | 98.9% |
| Somchem S355 | <<locked>> | 86% | 56,913 psi | 88% | 2762 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,898 psi | 88% | 2772 fps | 97.4% |
| Somchem S365 | <<locked>> | 94% | 58,204 psi | 90% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,304 psi | 87% | 2812 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 57,232 psi | 88% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,261 psi | 88% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 58,204 psi | 90% | 2736 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,739 psi | 87% | 2789 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 2789 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 55,492 psi | 85% | 2687 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,115 psi | 86% | 2799 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,203 psi | 88% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,667 psi | 89% | 2930 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,487 psi | 76% | 2782 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,405 psi | 87% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 58,566 psi | 90% | 2871 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,502 psi | 78% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,434 psi | 87% | 2805 fps | 98.9% |
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% | 54,694 psi | 84% | 2641 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,098 psi | 80% | 2664 fps | 98.8% |
| Accurate 3100 | <<locked>> | 82% | 31,705 psi | 49% | 2343 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 51,866 psi | 80% | 2651 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,059 psi | 62% | 2543 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 94% | 48,950 psi | 75% | 2789 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 48,776 psi | 75% | 2635 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,278 psi | 64% | 2582 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 44,744 psi | 69% | 2680 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 98% | 35,447 psi | 55% | 2523 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 54,578 psi | 84% | 2851 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 41,466 psi | 64% | 2582 fps | 95.9% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 41,466 psi | 64% | 2582 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,400 psi | 76% | 2654 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,663 psi | 81% | 2723 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,696 psi | 60% | 2549 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,251 psi | 68% | 2671 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 41,075 psi | 63% | 2579 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,711 psi | 60% | 2569 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,543 psi | 44% | 2316 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,414 psi | 47% | 2382 fps | 95.2% |
| Alliant Reloder-26 | 53.6 gr | 80% | 30,676 psi | 47% | 2431 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 40,857 psi | 63% | 2615 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 50,096 psi | 77% | 2671 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 38,711 psi | 60% | 2569 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 43,729 psi | 67% | 2552 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 98% | 43,816 psi | 67% | 2654 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 50,198 psi | 77% | 2684 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 41,887 psi | 64% | 2585 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 44,831 psi | 69% | 2608 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 47,950 psi | 74% | 2687 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,949 psi | 72% | 2671 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,361 psi | 56% | 2444 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,737 psi | 84% | 2766 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 38,305 psi | 59% | 2631 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 40,741 psi | 63% | 2598 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 42% | 1532 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,300 psi | 79% | 2664 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,345 psi | 82% | 2697 fps | 99.4% |
| IMR 4350 | <<locked>> | 80% | 39,218 psi | 60% | 2480 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,034 psi | 69% | 2579 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 38,421 psi | 59% | 2493 fps | 99% |
| IMR 4895 | <<locked>> | 80% | 53,983 psi | 83% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,615 psi | 72% | 2628 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 94% | 45,745 psi | 70% | 2710 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 51,605 psi | 79% | 2661 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,583 psi | 66% | 2533 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 40,944 psi | 63% | 2516 fps | 97.6% |
| Lovex S071 | <<locked>> | 86% | 30,850 psi | 47% | 2323 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,025 psi | 80% | 2710 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,495 psi | 64% | 2566 fps | 95.7% |
| Norma MRP | 54.6 gr | 84% | 35,360 psi | 54% | 2520 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 39,711 psi | 61% | 2536 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 52,721 psi | 81% | 2736 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,554 psi | 65% | 2661 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 38,392 psi | 59% | 2523 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 92% | 37,884 psi | 58% | 2543 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,963 psi | 43% | 1568 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,995 psi | 77% | 2667 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,007 psi | 72% | 2717 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,842 psi | 61% | 2559 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,493 psi | 59% | 2572 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,998 psi | 54% | 2543 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,214 psi | 82% | 2667 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,152 psi | 73% | 2618 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,455 psi | 70% | 2612 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 86% | 40,030 psi | 62% | 2556 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 43,729 psi | 67% | 2552 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,583 psi | 66% | 2533 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 51,605 psi | 79% | 2661 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,944 psi | 63% | 2516 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,124 psi | 74% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,964 psi | 74% | 2516 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,655 psi | 64% | 2480 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,653 psi | 61% | 2549 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 47,123 psi | 72% | 2615 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,615 psi | 72% | 2608 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 36,143 psi | 56% | 2493 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,723 psi | 55% | 2434 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 53,751 psi | 83% | 2628 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,867 psi | 83% | 2644 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,179 psi | 70% | 2549 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,046 psi | 63% | 2533 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 37,579 psi | 58% | 2470 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 52,025 psi | 80% | 2641 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,495 psi | 62% | 2536 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 31,705 psi | 49% | 2392 fps | 97.8% |
| Vihtavuori N560 | 59.8 gr | 92% | 46,949 psi | 72% | 2749 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 46,209 psi | 71% | 2723 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,030 psi | 62% | 2500 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,090 psi | 65% | 2592 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,208 psi | 39% | 2297 fps | 96.9% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,914 psi | 61% | 2523 fps | 95.4% |
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 93 powders for .280 Ackley Improved loaded with the .284 | 162gr | RWS Kegelspitz. Norma MRP delivers the highest muzzle velocity at 2,936 fps; across all powders the maximum-charge window runs from 1,716 fps to 2,936 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 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 162.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2225 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-26, Norma MRP, Vihtavuori N560 rank at the top here: for .280 Ackley Improved with the .284 | 162gr | RWS Kegelspitz 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.