Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 175gr | Nosler Partition bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 7828 SSC, Alliant Reloder-26 and Norma MRP.
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 2700 | <<locked>> | 82% | 56,072 psi | 86% | 2612 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 58,610 psi | 90% | 2717 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,840 psi | 86% | 2589 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,869 psi | 87% | 2703 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 57,043 psi | 88% | 2812 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 86% | 58,813 psi | 90% | 2667 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,479 psi | 88% | 2753 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 98% | 54,998 psi | 85% | 2753 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,942 psi | 58% | 2497 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,391 psi | 87% | 2641 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,420 psi | 87% | 2661 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,348 psi | 88% | 2753 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,071 psi | 85% | 2723 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,797 psi | 87% | 2740 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 58,117 psi | 89% | 2802 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,187 psi | 85% | 2723 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,819 psi | 74% | 2677 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,463 psi | 85% | 2815 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,229 psi | 82% | 2730 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 57,537 psi | 89% | 2661 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,700 psi | 67% | 2605 fps | 96.6% |
| Bofors RP5ᴾ | <<locked>> | 100% | 58,117 psi | 89% | 2802 fps | 99.5% |
| Bofors RP7 | <<locked>> | 88% | 56,391 psi | 87% | 2654 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,355 psi | 73% | 2621 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 84% | 57,624 psi | 89% | 2677 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,926 psi | 85% | 2700 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 58,334 psi | 90% | 2717 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 96% | 55,187 psi | 85% | 2697 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,754 psi | 89% | 2733 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,725 psi | 89% | 2677 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,760 psi | 72% | 2717 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 88% | 55,027 psi | 85% | 2736 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,724 psi | 56% | 1634 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,450 psi | 90% | 2651 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,145 psi | 88% | 2641 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 57,725 psi | 89% | 2690 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,146 psi | 89% | 2680 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 57,087 psi | 88% | 2694 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,899 psi | 89% | 2684 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,623 psi | 87% | 2684 fps | 98.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,188 psi | 86% | 2782 fps | 98.6% |
| Lovex S062 | <<locked>> | 84% | 58,755 psi | 90% | 2641 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,276 psi | 90% | 2674 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,289 psi | 87% | 2667 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,849 psi | 75% | 2582 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 55,767 psi | 86% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,581 psi | 90% | 2743 fps | 99.3% |
| Norma MRP | <<locked>> | 98% | 57,928 psi | 89% | 2825 fps | 100% |
| Norma URP | <<locked>> | 90% | 55,347 psi | 85% | 2687 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,695 psi | 87% | 2677 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,826 psi | 87% | 2802 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 92% | 57,624 psi | 89% | 2743 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,068 psi | 79% | 2687 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,521 psi | 58% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,305 psi | 88% | 2664 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,494 psi | 90% | 2759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,579 psi | 87% | 2726 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,781 psi | 84% | 2753 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,804 psi | 72% | 2717 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,072 psi | 88% | 2605 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,711 psi | 89% | 2657 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,622 psi | 86% | 2674 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 96% | 56,289 psi | 87% | 2730 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 88% | 56,391 psi | 87% | 2654 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,276 psi | 90% | 2674 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 58,755 psi | 90% | 2641 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,289 psi | 87% | 2667 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,288 psi | 85% | 2664 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,870 psi | 89% | 2533 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,986 psi | 89% | 2635 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,811 psi | 86% | 2726 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 57,305 psi | 88% | 2651 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,232 psi | 88% | 2671 fps | 97.9% |
| Somchem S365 | <<locked>> | 94% | 58,682 psi | 90% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,724 psi | 87% | 2703 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 57,653 psi | 89% | 2559 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,638 psi | 89% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 58,552 psi | 90% | 2625 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,406 psi | 88% | 2680 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,144 psi | 86% | 2684 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 55,796 psi | 86% | 2575 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,275 psi | 87% | 2684 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,885 psi | 89% | 2749 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,972 psi | 89% | 2822 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,864 psi | 77% | 2684 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,782 psi | 87% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,230 psi | 85% | 2707 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,010 psi | 78% | 2799 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,826 psi | 87% | 2700 fps | 99.2% |
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% | 52,402 psi | 81% | 2559 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 29,979 psi | 46% | 2208 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 52,373 psi | 81% | 2543 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,625 psi | 63% | 2451 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 92% | 46,122 psi | 71% | 2635 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 49,081 psi | 76% | 2530 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,001 psi | 60% | 2434 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 90% | 42,380 psi | 65% | 2530 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 33,460 psi | 51% | 2382 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,850 psi | 77% | 2549 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,229 psi | 82% | 2615 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,059 psi | 60% | 2454 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,643 psi | 69% | 2569 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,667 psi | 59% | 2428 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,637 psi | 56% | 2425 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,834 psi | 44% | 2238 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,834 psi | 44% | 2251 fps | 95.2% |
| Alliant Reloder-26 | 50.8 gr | 80% | 30,893 psi | 48% | 2349 fps | 97.3% |
| Bofors RP15 | <<locked>> | 90% | 38,638 psi | 59% | 2467 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 50,459 psi | 78% | 2566 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,843 psi | 63% | 2549 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 36,637 psi | 56% | 2425 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 44,106 psi | 68% | 2454 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 41,408 psi | 64% | 2507 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 50,589 psi | 78% | 2579 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,308 psi | 65% | 2493 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 45,165 psi | 69% | 2507 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 45,150 psi | 69% | 2533 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,411 psi | 68% | 2520 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,709 psi | 56% | 2352 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,289 psi | 56% | 2484 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 41,176 psi | 63% | 2507 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,441 psi | 42% | 1457 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,663 psi | 79% | 2559 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,664 psi | 83% | 2589 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 39,639 psi | 61% | 2392 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,455 psi | 70% | 2480 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 38,870 psi | 60% | 2402 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 54,621 psi | 84% | 2641 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,193 psi | 68% | 2480 fps | 95.4% |
| IMR 7828 SSC | 54.6 gr | 92% | 43,178 psi | 66% | 2559 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 51,996 psi | 80% | 2552 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,931 psi | 66% | 2434 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 41,379 psi | 64% | 2425 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 29,312 psi | 45% | 2192 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 52,591 psi | 81% | 2602 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,175 psi | 60% | 2418 fps | 95.6% |
| Norma MRP | 50.6 gr | 82% | 33,431 psi | 51% | 2379 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 40,176 psi | 62% | 2441 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 52,924 psi | 81% | 2625 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,772 psi | 66% | 2566 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 38,841 psi | 60% | 2431 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 35,520 psi | 55% | 2395 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,992 psi | 43% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,517 psi | 78% | 2566 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,398 psi | 73% | 2612 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,205 psi | 62% | 2464 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,711 psi | 60% | 2474 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,040 psi | 51% | 2402 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 53,809 psi | 83% | 2559 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,630 psi | 73% | 2516 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,105 psi | 66% | 2467 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 38,000 psi | 58% | 2415 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 44,106 psi | 68% | 2454 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,931 psi | 66% | 2434 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 51,996 psi | 80% | 2552 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,379 psi | 64% | 2425 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,617 psi | 75% | 2566 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,341 psi | 74% | 2411 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,134 psi | 65% | 2385 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,652 psi | 58% | 2408 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 47,514 psi | 73% | 2510 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 43,845 psi | 67% | 2457 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,651 psi | 56% | 2402 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,852 psi | 52% | 2297 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 54,244 psi | 83% | 2516 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,404 psi | 84% | 2536 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,643 psi | 70% | 2448 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,553 psi | 64% | 2438 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,505 psi | 55% | 2329 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 52,446 psi | 81% | 2533 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,901 psi | 63% | 2441 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 32,097 psi | 49% | 2306 fps | 98.4% |
| Vihtavuori N560 | <<locked>> | 90% | 44,237 psi | 68% | 2592 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 43,584 psi | 67% | 2572 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,495 psi | 62% | 2408 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,569 psi | 65% | 2497 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,527 psi | 39% | 2231 fps | 98.1% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,753 psi | 58% | 2382 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 95 powders for .280 Ackley Improved loaded with the .284 | 175gr | Nosler Partition. Norma MRP delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,634 fps to 2,825 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2217, 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. IMR 7828 SSC, Alliant Reloder-26, Norma MRP rank at the top here: for .280 Ackley Improved with the .284 | 175gr | Nosler Partition they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, ReloadSwiss RS 80, Vihtavuori N568 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.