Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 170gr | Rhino Solid Shank 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.
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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>> | 82% | 58,088 psi | 89% | 2608 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,056 psi | 85% | 2635 fps | 99.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,377 psi | 88% | 2740 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 58,291 psi | 90% | 2661 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,811 psi | 86% | 2730 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,753 psi | 86% | 2828 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 86% | 58,044 psi | 89% | 2697 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,391 psi | 87% | 2776 fps | 99.1% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,972 psi | 89% | 2835 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,159 psi | 57% | 2507 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,914 psi | 89% | 2818 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,608 psi | 86% | 2671 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,651 psi | 86% | 2690 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,318 psi | 87% | 2779 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,711 psi | 89% | 2799 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,724 psi | 86% | 2762 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,159 psi | 88% | 2828 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,925 psi | 83% | 2749 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,818 psi | 72% | 2694 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 58,291 psi | 90% | 2890 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,388 psi | 81% | 2756 fps | 98.6% |
| Bofors RP3 | <<locked>> | 84% | 56,318 psi | 87% | 2684 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,670 psi | 66% | 2618 fps | 96% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,159 psi | 88% | 2828 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 55,608 psi | 86% | 2677 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,398 psi | 71% | 2638 fps | 97% |
| Hodgdon H380 | <<locked>> | 84% | 56,724 psi | 87% | 2707 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,856 psi | 89% | 2782 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 57,101 psi | 88% | 2736 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 98% | 57,899 psi | 89% | 2772 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,942 psi | 88% | 2759 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,681 psi | 87% | 2703 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 58,146 psi | 89% | 2736 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,745 psi | 70% | 2733 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 90% | 58,247 psi | 90% | 2822 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,622 psi | 56% | 1657 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 58,581 psi | 90% | 2697 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,392 psi | 88% | 2674 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,478 psi | 87% | 2667 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 56,797 psi | 87% | 2713 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,305 psi | 88% | 2703 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 56,057 psi | 86% | 2720 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,072 psi | 88% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,666 psi | 86% | 2703 fps | 97.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,332 psi | 85% | 2805 fps | 98.2% |
| Lovex S062 | <<locked>> | 84% | 57,667 psi | 89% | 2667 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,435 psi | 88% | 2700 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,419 psi | 85% | 2694 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,805 psi | 74% | 2602 fps | 99.5% |
| Norma 203B | <<locked>> | 84% | 58,537 psi | 90% | 2726 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,522 psi | 88% | 2766 fps | 99.1% |
| Norma MRP | <<locked>> | 98% | 56,550 psi | 87% | 2848 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 58,001 psi | 89% | 2762 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,811 psi | 86% | 2703 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,898 psi | 86% | 2825 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 92% | 56,536 psi | 87% | 2766 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,806 psi | 77% | 2703 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,391 psi | 58% | 1696 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,463 psi | 87% | 2694 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,348 psi | 88% | 2789 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,448 psi | 85% | 2749 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,667 psi | 89% | 2831 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,701 psi | 70% | 2730 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 82% | 56,347 psi | 87% | 2635 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,492 psi | 87% | 2680 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 58,015 psi | 89% | 2746 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 96% | 55,172 psi | 85% | 2753 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 88% | 55,608 psi | 86% | 2677 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,435 psi | 88% | 2700 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,667 psi | 89% | 2667 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,419 psi | 85% | 2694 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 58,276 psi | 90% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,174 psi | 88% | 2566 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,058 psi | 88% | 2657 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 58,523 psi | 90% | 2802 fps | 99.4% |
| Somchem S355 | <<locked>> | 86% | 56,492 psi | 87% | 2677 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,173 psi | 86% | 2690 fps | 97.5% |
| Somchem S365 | <<locked>> | 94% | 57,479 psi | 88% | 2759 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,927 psi | 86% | 2730 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 56,884 psi | 88% | 2592 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,898 psi | 88% | 2608 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,667 psi | 89% | 2651 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,434 psi | 87% | 2707 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,042 psi | 85% | 2707 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 84% | 58,566 psi | 90% | 2651 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,303 psi | 85% | 2710 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,637 psi | 87% | 2776 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,695 psi | 87% | 2841 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,646 psi | 75% | 2700 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,709 psi | 86% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,856 psi | 89% | 2782 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,429 psi | 76% | 2818 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,695 psi | 86% | 2720 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% | 54,404 psi | 84% | 2562 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,677 psi | 80% | 2585 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 31,299 psi | 48% | 2274 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 51,590 psi | 79% | 2572 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,639 psi | 61% | 2467 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 94% | 48,486 psi | 75% | 2710 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,240 psi | 74% | 2552 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,174 psi | 59% | 2448 fps | 95% |
| ADI AR 2213 | <<locked>> | 92% | 44,164 psi | 68% | 2598 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 98% | 34,911 psi | 54% | 2448 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,867 psi | 83% | 2762 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,197 psi | 76% | 2579 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,214 psi | 80% | 2641 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,450 psi | 59% | 2477 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,598 psi | 67% | 2589 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,043 psi | 59% | 2448 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,174 psi | 59% | 2493 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,326 psi | 44% | 2254 fps | 98% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,037 psi | 46% | 2313 fps | 95.4% |
| Alliant Reloder-26 | 51.1 gr | 80% | 30,284 psi | 47% | 2362 fps | 96.6% |
| Bofors RP15 | <<locked>> | 90% | 37,869 psi | 58% | 2484 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 49,429 psi | 76% | 2589 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,914 psi | 61% | 2562 fps | 95% |
| Bofors RP5 | <<locked>> | 88% | 38,174 psi | 59% | 2493 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 43,294 psi | 67% | 2474 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 96% | 40,582 psi | 62% | 2520 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 49,879 psi | 77% | 2605 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,611 psi | 64% | 2513 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 80% | 44,266 psi | 68% | 2526 fps | 97.3% |
| Hodgdon H4831 | <<locked>> | 92% | 47,369 psi | 73% | 2608 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,340 psi | 71% | 2589 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,085 psi | 56% | 2375 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,244 psi | 83% | 2680 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,724 psi | 58% | 2552 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 40,422 psi | 62% | 2526 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 42% | 1480 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,984 psi | 85% | 2648 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,734 psi | 78% | 2582 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,026 psi | 82% | 2618 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 39,044 psi | 60% | 2411 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,875 psi | 69% | 2503 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 38,029 psi | 59% | 2421 fps | 99.1% |
| IMR 4895 | <<locked>> | 80% | 53,592 psi | 82% | 2664 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,340 psi | 71% | 2552 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 92% | 42,366 psi | 65% | 2575 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 51,068 psi | 79% | 2575 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,337 psi | 65% | 2457 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 40,567 psi | 62% | 2444 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 30,589 psi | 47% | 2257 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 51,576 psi | 79% | 2628 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,537 psi | 59% | 2438 fps | 95% |
| Norma MRP | 52.1 gr | 84% | 35,012 psi | 54% | 2451 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 39,291 psi | 60% | 2461 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 80% | 52,054 psi | 80% | 2651 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,134 psi | 65% | 2585 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 38,174 psi | 59% | 2451 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 92% | 37,347 psi | 57% | 2467 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,934 psi | 43% | 1516 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,545 psi | 76% | 2589 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,282 psi | 71% | 2631 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,421 psi | 61% | 2487 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,000 psi | 58% | 2493 fps | 98.7% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,621 psi | 53% | 2474 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 52,881 psi | 81% | 2585 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,644 psi | 72% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,395 psi | 65% | 2487 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 84% | 37,115 psi | 57% | 2428 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 43,294 psi | 67% | 2474 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,337 psi | 65% | 2457 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 51,068 psi | 79% | 2575 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,567 psi | 62% | 2444 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,863 psi | 74% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,543 psi | 73% | 2438 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,350 psi | 64% | 2405 fps | 97.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,334 psi | 61% | 2477 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 46,862 psi | 72% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,122 psi | 71% | 2530 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 35,926 psi | 55% | 2421 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,302 psi | 54% | 2362 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 53,272 psi | 82% | 2546 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,374 psi | 82% | 2562 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,744 psi | 69% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,654 psi | 63% | 2457 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 37,231 psi | 57% | 2398 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 51,735 psi | 80% | 2562 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,234 psi | 62% | 2461 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 31,444 psi | 48% | 2323 fps | 98% |
| Vihtavuori N560 | 57 gr | 92% | 46,296 psi | 71% | 2667 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 96% | 42,540 psi | 65% | 2589 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,581 psi | 61% | 2425 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,611 psi | 64% | 2513 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,034 psi | 39% | 2238 fps | 97.3% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,624 psi | 61% | 2454 fps | 95.6% |
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 98 powders for .280 Ackley Improved loaded with the .284 | 170gr | Rhino Solid Shank. Alliant Reloder-26 delivers the highest muzzle velocity at 2,890 fps; across all powders the maximum-charge window runs from 1,657 fps to 2,890 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.284" calls for a 1:11.0 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 | 170gr | Rhino Solid Shank 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.