Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 185gr | Nosler RDF bullet and 92 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 2700 | <<locked>> | 82% | 56,260 psi | 87% | 2533 fps | 99.7% |
| Accurate 3100 | <<locked>> | 98% | 54,839 psi | 84% | 2589 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,275 psi | 87% | 2510 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,087 psi | 88% | 2621 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 57,319 psi | 88% | 2733 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 84% | 55,666 psi | 86% | 2543 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,725 psi | 89% | 2674 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 98% | 55,492 psi | 85% | 2680 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,250 psi | 67% | 2467 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,159 psi | 59% | 2431 fps | 98% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,841 psi | 89% | 2671 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,681 psi | 87% | 2559 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,985 psi | 88% | 2585 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,870 psi | 89% | 2671 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,288 psi | 85% | 2641 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,087 psi | 88% | 2664 fps | 99.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 58,421 psi | 90% | 2723 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,288 psi | 85% | 2641 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,051 psi | 74% | 2598 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,695 psi | 86% | 2733 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 57,798 psi | 89% | 2641 fps | 96.3% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,722 psi | 83% | 2657 fps | 99.3% |
| Bofors RP3 | <<locked>> | 84% | 57,667 psi | 89% | 2575 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,932 psi | 68% | 2536 fps | 97.1% |
| Bofors RP5ᴾ | <<locked>> | 100% | 58,421 psi | 90% | 2723 fps | 99.7% |
| Bofors RP7 | <<locked>> | 88% | 56,608 psi | 87% | 2572 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,384 psi | 73% | 2549 fps | 98% |
| Hodgdon H380 | <<locked>> | 84% | 57,769 psi | 89% | 2595 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,434 psi | 85% | 2625 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 58,450 psi | 90% | 2635 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 96% | 55,608 psi | 86% | 2625 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 58,276 psi | 90% | 2661 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 58,030 psi | 89% | 2595 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,036 psi | 72% | 2648 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 88% | 55,448 psi | 85% | 2661 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,709 psi | 56% | 1572 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,653 psi | 90% | 2569 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,406 psi | 88% | 2559 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 58,001 psi | 89% | 2612 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,392 psi | 90% | 2598 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 57,363 psi | 88% | 2612 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,479 psi | 90% | 2605 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,826 psi | 87% | 2605 fps | 98.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,449 psi | 87% | 2707 fps | 98.9% |
| Lovex S062 | <<locked>> | 82% | 55,506 psi | 85% | 2516 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,639 psi | 90% | 2592 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,391 psi | 87% | 2589 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,023 psi | 75% | 2507 fps | 99.9% |
| Norma 203B | <<locked>> | 82% | 56,275 psi | 87% | 2572 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,769 psi | 90% | 2664 fps | 99.5% |
| Norma MRP | <<locked>> | 98% | 58,349 psi | 90% | 2749 fps | 100% |
| Norma URP | <<locked>> | 90% | 55,419 psi | 85% | 2605 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,014 psi | 88% | 2595 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,377 psi | 88% | 2726 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 92% | 57,812 psi | 89% | 2661 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,053 psi | 79% | 2608 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,536 psi | 58% | 1611 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,566 psi | 89% | 2585 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,740 psi | 90% | 2677 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,753 psi | 87% | 2644 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,027 psi | 85% | 2674 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,949 psi | 72% | 2641 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 82% | 57,392 psi | 88% | 2523 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,885 psi | 89% | 2575 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,637 psi | 86% | 2595 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 96% | 56,521 psi | 87% | 2651 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 88% | 56,608 psi | 87% | 2572 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,639 psi | 90% | 2592 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,506 psi | 85% | 2516 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,391 psi | 87% | 2589 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,825 psi | 86% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 58,363 psi | 90% | 2457 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 58,131 psi | 89% | 2552 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,043 psi | 86% | 2648 fps | 99.5% |
| Somchem S355 | <<locked>> | 86% | 57,711 psi | 89% | 2569 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,479 psi | 88% | 2595 fps | 98.3% |
| Somchem S365 | <<locked>> | 92% | 55,448 psi | 85% | 2608 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,087 psi | 88% | 2628 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 57,899 psi | 89% | 2477 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 58,102 psi | 89% | 2497 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,303 psi | 85% | 2500 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,609 psi | 89% | 2598 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,391 psi | 87% | 2608 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 82% | 56,144 psi | 86% | 2497 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,594 psi | 87% | 2605 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 58,160 psi | 89% | 2671 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 58,436 psi | 90% | 2746 fps | 98.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,966 psi | 77% | 2608 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,116 psi | 88% | 2569 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,434 psi | 85% | 2625 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,300 psi | 79% | 2717 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,087 psi | 88% | 2625 fps | 99.5% |
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 2700 | <<locked>> | 80% | 52,663 psi | 81% | 2484 fps | 99.4% |
| Accurate 3100 | <<locked>> | 80% | 30,110 psi | 46% | 2149 fps | 96% |
| Accurate 4064 | <<locked>> | 80% | 52,649 psi | 81% | 2464 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,712 psi | 63% | 2375 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 90% | 43,134 psi | 66% | 2503 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 49,327 psi | 76% | 2451 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 36,666 psi | 56% | 2313 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 90% | 42,569 psi | 65% | 2461 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 40,364 psi | 62% | 2411 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 94% | 31,691 psi | 49% | 2270 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 36,970 psi | 57% | 2316 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,169 psi | 77% | 2474 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,330 psi | 82% | 2536 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,291 psi | 60% | 2385 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,773 psi | 69% | 2490 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 36,622 psi | 56% | 2313 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,869 psi | 57% | 2362 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,022 psi | 45% | 2175 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,892 psi | 44% | 2188 fps | 95.9% |
| Alliant Reloder-26 | 48.8 gr | 80% | 31,096 psi | 48% | 2287 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,360 psi | 84% | 2589 fps | 95.5% |
| Bofors RP15 | <<locked>> | 88% | 36,390 psi | 56% | 2349 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 50,633 psi | 78% | 2484 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 38,421 psi | 59% | 2428 fps | 95.5% |
| Bofors RP5 | <<locked>> | 86% | 36,869 psi | 57% | 2362 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 44,338 psi | 68% | 2385 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 38,870 psi | 60% | 2385 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 50,821 psi | 78% | 2500 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,511 psi | 65% | 2421 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 45,324 psi | 70% | 2434 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 42,380 psi | 65% | 2408 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,643 psi | 69% | 2451 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,898 psi | 57% | 2283 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,332 psi | 56% | 2418 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 41,495 psi | 64% | 2441 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,514 psi | 42% | 1404 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,866 psi | 80% | 2477 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,056 psi | 83% | 2513 fps | 99.8% |
| IMR 4350 | <<locked>> | 80% | 39,943 psi | 61% | 2323 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,701 psi | 70% | 2408 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 38,972 psi | 60% | 2333 fps | 99.6% |
| IMR 4895 | <<locked>> | 80% | 54,723 psi | 84% | 2559 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 41,814 psi | 64% | 2362 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 90% | 40,582 psi | 62% | 2434 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 52,228 psi | 80% | 2470 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,149 psi | 66% | 2362 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 41,452 psi | 64% | 2352 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 29,559 psi | 45% | 2136 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 52,678 psi | 81% | 2523 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,392 psi | 61% | 2352 fps | 96.2% |
| Norma MRP | 47.4 gr | 80% | 31,357 psi | 48% | 2257 fps | 95% |
| Norma URP | <<locked>> | 80% | 40,234 psi | 62% | 2369 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 80% | 53,359 psi | 82% | 2549 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 40,292 psi | 62% | 2441 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 39,073 psi | 60% | 2362 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 33,272 psi | 51% | 2274 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,108 psi | 43% | 1437 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,821 psi | 78% | 2490 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,500 psi | 73% | 2530 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,509 psi | 62% | 2398 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,030 psi | 60% | 2408 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,214 psi | 51% | 2343 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 80% | 54,012 psi | 83% | 2480 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,703 psi | 73% | 2438 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 40,582 psi | 62% | 2346 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 82% | 35,679 psi | 55% | 2297 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,338 psi | 68% | 2385 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,149 psi | 66% | 2362 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 52,228 psi | 80% | 2470 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,452 psi | 64% | 2352 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,878 psi | 75% | 2490 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,718 psi | 75% | 2339 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,250 psi | 65% | 2316 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 35,360 psi | 54% | 2290 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 47,790 psi | 74% | 2434 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 44,077 psi | 68% | 2388 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 36,970 psi | 57% | 2333 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,997 psi | 52% | 2231 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 54,665 psi | 84% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,404 psi | 84% | 2454 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,672 psi | 70% | 2369 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,655 psi | 64% | 2365 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 33,504 psi | 52% | 2218 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 52,605 psi | 81% | 2454 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,075 psi | 63% | 2369 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 32,343 psi | 50% | 2244 fps | 98.9% |
| Vihtavuori N560 | 52.1 gr | 88% | 41,466 psi | 64% | 2464 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 40,814 psi | 63% | 2451 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,640 psi | 63% | 2336 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,786 psi | 66% | 2425 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,686 psi | 40% | 2175 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 84% | 35,447 psi | 55% | 2264 fps | 95% |
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 92 powders for .280 Ackley Improved loaded with the .284 | 185gr | Nosler RDF. Norma MRP delivers the highest muzzle velocity at 2,749 fps; across all powders the maximum-charge window runs from 1,572 fps to 2,749 fps. ADI AR 2217 gives the best case fill at 100 %, and 92 of the 92 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 185.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-22 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 | 185gr | Nosler RDF 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.