Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 162gr | RWS ID Classic bullet and 91 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% | 58,320 psi | 90% | 2687 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,434 psi | 85% | 2720 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 58,001 psi | 89% | 2825 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 58,755 psi | 90% | 2746 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,289 psi | 87% | 2815 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,347 psi | 87% | 2913 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 86% | 58,291 psi | 90% | 2779 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,029 psi | 88% | 2864 fps | 99% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 58,436 psi | 90% | 2917 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,753 psi | 58% | 2585 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 58,305 psi | 90% | 2904 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,912 psi | 86% | 2753 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,028 psi | 86% | 2776 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,782 psi | 87% | 2864 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 58,349 psi | 90% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,304 psi | 87% | 2848 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 2913 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,766 psi | 84% | 2838 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,384 psi | 73% | 2779 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,810 psi | 84% | 2920 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,765 psi | 81% | 2835 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 56,840 psi | 87% | 2772 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 2913 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 55,941 psi | 86% | 2762 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,789 psi | 72% | 2717 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 84% | 57,116 psi | 88% | 2792 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 58,392 psi | 90% | 2867 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 57,566 psi | 89% | 2822 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 98% | 58,508 psi | 90% | 2858 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,276 psi | 88% | 2841 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,377 psi | 88% | 2792 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 58,581 psi | 90% | 2822 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,456 psi | 71% | 2818 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 88% | 54,679 psi | 84% | 2848 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,767 psi | 57% | 1719 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,827 psi | 89% | 2762 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,724 psi | 87% | 2749 fps | 99.7% |
| IMR 4350 | <<locked>> | 92% | 57,072 psi | 88% | 2799 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,595 psi | 89% | 2789 fps | 99.7% |
| IMR 4831 | <<locked>> | 92% | 56,652 psi | 87% | 2805 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,479 psi | 88% | 2799 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,231 psi | 87% | 2792 fps | 97.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,840 psi | 86% | 2890 fps | 98.1% |
| Lovex S062 | <<locked>> | 84% | 58,088 psi | 89% | 2753 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,928 psi | 89% | 2785 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,854 psi | 86% | 2779 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,196 psi | 74% | 2677 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 55,361 psi | 85% | 2759 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,175 psi | 89% | 2854 fps | 99% |
| Norma MRP | <<locked>> | 98% | 57,377 psi | 88% | 2936 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 58,378 psi | 90% | 2848 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,101 psi | 86% | 2789 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,550 psi | 87% | 2913 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 92% | 57,159 psi | 88% | 2854 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,589 psi | 78% | 2789 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 58% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,000 psi | 88% | 2779 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,812 psi | 89% | 2874 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,188 psi | 86% | 2838 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 58,436 psi | 90% | 2920 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,224 psi | 71% | 2808 fps | 99% |
| Rottweil R 902 | <<locked>> | 82% | 56,652 psi | 87% | 2717 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,971 psi | 88% | 2766 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 58,653 psi | 90% | 2831 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 96% | 55,811 psi | 86% | 2838 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 55,941 psi | 86% | 2762 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,928 psi | 89% | 2785 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 58,088 psi | 89% | 2753 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,854 psi | 86% | 2779 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 58,465 psi | 90% | 2825 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,551 psi | 89% | 2648 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,435 psi | 88% | 2740 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,332 psi | 85% | 2831 fps | 98.9% |
| Somchem S355 | <<locked>> | 86% | 56,724 psi | 87% | 2762 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,695 psi | 87% | 2772 fps | 97.4% |
| Somchem S365 | <<locked>> | 94% | 58,334 psi | 90% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,405 psi | 87% | 2815 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 57,029 psi | 88% | 2671 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,305 psi | 88% | 2690 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 58,305 psi | 90% | 2736 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,869 psi | 87% | 2792 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,593 psi | 86% | 2789 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 55,303 psi | 85% | 2687 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,883 psi | 86% | 2799 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,276 psi | 88% | 2861 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,435 psi | 88% | 2927 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,313 psi | 76% | 2782 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,507 psi | 87% | 2759 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 58,392 psi | 90% | 2867 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,285 psi | 77% | 2904 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,521 psi | 87% | 2808 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% | 54,766 psi | 84% | 2644 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,909 psi | 80% | 2664 fps | 98.8% |
| Accurate 3100 | <<locked>> | 82% | 31,604 psi | 49% | 2343 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 51,938 psi | 80% | 2654 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,118 psi | 62% | 2546 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 94% | 49,037 psi | 75% | 2792 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 48,588 psi | 75% | 2635 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 41,089 psi | 63% | 2579 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 44,817 psi | 69% | 2684 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 98% | 35,346 psi | 54% | 2523 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 54,331 psi | 84% | 2851 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,487 psi | 76% | 2657 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,707 psi | 81% | 2726 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,740 psi | 60% | 2552 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,092 psi | 68% | 2671 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,886 psi | 63% | 2575 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,566 psi | 59% | 2566 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,572 psi | 44% | 2320 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,313 psi | 47% | 2382 fps | 95.1% |
| Alliant Reloder-26 | 53.5 gr | 80% | 30,545 psi | 47% | 2431 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 40,727 psi | 63% | 2615 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 49,908 psi | 77% | 2671 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 38,566 psi | 59% | 2566 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 43,772 psi | 67% | 2556 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 98% | 43,888 psi | 68% | 2657 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 50,256 psi | 77% | 2687 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 41,930 psi | 65% | 2589 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 44,657 psi | 69% | 2605 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 47,776 psi | 74% | 2687 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 47,007 psi | 72% | 2671 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,216 psi | 56% | 2444 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,824 psi | 84% | 2769 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 38,189 psi | 59% | 2628 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 40,828 psi | 63% | 2605 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 42% | 1535 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,126 psi | 79% | 2664 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,417 psi | 82% | 2700 fps | 99.4% |
| IMR 4350 | <<locked>> | 80% | 39,247 psi | 60% | 2484 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,092 psi | 69% | 2582 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 38,261 psi | 59% | 2493 fps | 99% |
| IMR 4895 | <<locked>> | 80% | 54,099 psi | 83% | 2753 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,673 psi | 72% | 2631 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 94% | 45,600 psi | 70% | 2710 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 51,430 psi | 79% | 2661 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,627 psi | 66% | 2533 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 40,799 psi | 63% | 2516 fps | 97.6% |
| Lovex S071 | <<locked>> | 86% | 30,893 psi | 48% | 2326 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,069 psi | 80% | 2713 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,568 psi | 64% | 2569 fps | 95.7% |
| Norma MRP | 54.5 gr | 84% | 35,230 psi | 54% | 2520 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 39,552 psi | 61% | 2533 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 52,504 psi | 81% | 2736 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,409 psi | 65% | 2661 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 38,435 psi | 59% | 2523 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 92% | 37,739 psi | 58% | 2539 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,992 psi | 43% | 1572 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,053 psi | 77% | 2671 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,789 psi | 72% | 2717 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,885 psi | 61% | 2562 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,334 psi | 59% | 2569 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,070 psi | 54% | 2546 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,316 psi | 82% | 2671 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,963 psi | 72% | 2618 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 45,527 psi | 70% | 2615 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 86% | 40,074 psi | 62% | 2559 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 43,772 psi | 67% | 2556 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,627 psi | 66% | 2533 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 51,430 psi | 79% | 2661 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,799 psi | 63% | 2516 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,196 psi | 74% | 2674 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,993 psi | 74% | 2520 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,771 psi | 64% | 2484 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,711 psi | 61% | 2552 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 47,195 psi | 73% | 2618 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,485 psi | 72% | 2605 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 36,187 psi | 56% | 2493 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,766 psi | 55% | 2438 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 53,824 psi | 83% | 2631 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,693 psi | 83% | 2644 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,991 psi | 69% | 2546 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,089 psi | 63% | 2536 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 37,420 psi | 58% | 2467 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 52,098 psi | 80% | 2644 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,567 psi | 62% | 2539 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 31,749 psi | 49% | 2395 fps | 97.8% |
| Vihtavuori N560 | 59.7 gr | 92% | 46,775 psi | 72% | 2746 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 46,006 psi | 71% | 2723 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,118 psi | 62% | 2503 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,930 psi | 65% | 2589 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,237 psi | 39% | 2303 fps | 97% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,958 psi | 61% | 2526 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 97 powders for .280 Ackley Improved loaded with the .284 | 162gr | RWS ID Classic. Norma MRP delivers the highest muzzle velocity at 2,936 fps; across all powders the maximum-charge window runs from 1,719 fps to 2,936 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 162.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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 ID Classic they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Norma 217, ReloadSwiss RS 80 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.