Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 175gr | Barnes Solid RN bullet and 94 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% | 58,436 psi | 90% | 2569 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,477 psi | 85% | 2602 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,957 psi | 89% | 2707 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,361 psi | 85% | 2579 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,217 psi | 86% | 2694 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,144 psi | 86% | 2795 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 86% | 58,421 psi | 90% | 2657 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,855 psi | 87% | 2740 fps | 99.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 58,262 psi | 90% | 2795 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,594 psi | 58% | 2484 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 58,537 psi | 90% | 2782 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,290 psi | 88% | 2743 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,290 psi | 88% | 2743 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,999 psi | 86% | 2631 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,999 psi | 86% | 2654 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,942 psi | 88% | 2743 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 58,479 psi | 90% | 2766 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,507 psi | 87% | 2733 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,493 psi | 88% | 2792 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,505 psi | 84% | 2713 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,340 psi | 73% | 2664 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,810 psi | 84% | 2802 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,895 psi | 81% | 2723 fps | 98.9% |
| Bofors RP3 | <<locked>> | 84% | 57,116 psi | 88% | 2654 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,178 psi | 66% | 2592 fps | 96.4% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,493 psi | 88% | 2792 fps | 99.5% |
| Bofors RP7 | <<locked>> | 88% | 56,072 psi | 86% | 2644 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,876 psi | 72% | 2608 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 84% | 57,203 psi | 88% | 2671 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 58,233 psi | 90% | 2746 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 57,696 psi | 89% | 2703 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 98% | 58,494 psi | 90% | 2740 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,159 psi | 88% | 2723 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,377 psi | 88% | 2671 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 58,653 psi | 90% | 2697 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,253 psi | 71% | 2703 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 88% | 54,723 psi | 84% | 2730 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,608 psi | 56% | 1627 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,044 psi | 89% | 2641 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,782 psi | 87% | 2631 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 57,145 psi | 88% | 2677 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,508 psi | 88% | 2667 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 56,724 psi | 87% | 2687 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,479 psi | 88% | 2677 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,086 psi | 86% | 2674 fps | 97.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,927 psi | 86% | 2776 fps | 98.5% |
| Lovex S062 | <<locked>> | 84% | 58,334 psi | 90% | 2635 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,914 psi | 89% | 2664 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,970 psi | 86% | 2661 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,283 psi | 74% | 2569 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 55,361 psi | 85% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,276 psi | 90% | 2736 fps | 99.3% |
| Norma MRP | <<locked>> | 98% | 57,290 psi | 88% | 2815 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 58,378 psi | 90% | 2726 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,318 psi | 87% | 2667 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,246 psi | 87% | 2789 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 92% | 57,290 psi | 88% | 2736 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,256 psi | 77% | 2671 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,391 psi | 58% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,956 psi | 88% | 2657 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,044 psi | 89% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,217 psi | 86% | 2720 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 58,233 psi | 90% | 2795 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,398 psi | 71% | 2703 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 56,623 psi | 87% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,971 psi | 88% | 2644 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 58,726 psi | 90% | 2713 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 96% | 55,666 psi | 86% | 2720 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 56,072 psi | 86% | 2644 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,914 psi | 89% | 2664 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 58,334 psi | 90% | 2635 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,970 psi | 86% | 2661 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 58,552 psi | 90% | 2703 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,798 psi | 89% | 2530 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,653 psi | 89% | 2625 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,201 psi | 85% | 2713 fps | 99.2% |
| Somchem S355 | <<locked>> | 86% | 56,898 psi | 88% | 2641 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,710 psi | 87% | 2661 fps | 97.8% |
| Somchem S365 | <<locked>> | 94% | 58,276 psi | 90% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,420 psi | 87% | 2697 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 57,159 psi | 88% | 2552 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,217 psi | 88% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 58,189 psi | 90% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,739 psi | 87% | 2671 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,637 psi | 86% | 2674 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 82% | 55,434 psi | 85% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,985 psi | 86% | 2680 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,188 psi | 88% | 2740 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,363 psi | 88% | 2808 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,313 psi | 76% | 2674 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,173 psi | 86% | 2635 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 58,552 psi | 90% | 2749 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,314 psi | 77% | 2785 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,231 psi | 87% | 2690 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 2495 | <<locked>> | 80% | 54,984 psi | 85% | 2526 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,054 psi | 80% | 2552 fps | 99.1% |
| Accurate 3100 | <<locked>> | 80% | 29,660 psi | 46% | 2201 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 52,170 psi | 80% | 2539 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,205 psi | 62% | 2441 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 92% | 45,571 psi | 70% | 2621 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 48,718 psi | 75% | 2520 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,711 psi | 60% | 2425 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 90% | 41,843 psi | 64% | 2516 fps | 95% |
| ADI AR 2225 | <<locked>> | 96% | 33,272 psi | 51% | 2375 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 54,404 psi | 84% | 2726 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,754 psi | 60% | 2425 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,754 psi | 60% | 2425 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,472 psi | 76% | 2543 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,794 psi | 81% | 2608 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,914 psi | 60% | 2448 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,251 psi | 68% | 2559 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,363 psi | 59% | 2418 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,624 psi | 59% | 2467 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,689 psi | 44% | 2231 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,342 psi | 47% | 2290 fps | 96% |
| Alliant Reloder-26 | 50.4 gr | 80% | 30,632 psi | 47% | 2339 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 38,348 psi | 59% | 2457 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 50,053 psi | 77% | 2556 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,379 psi | 62% | 2536 fps | 95.5% |
| Bofors RP5 | <<locked>> | 88% | 38,624 psi | 59% | 2467 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 43,729 psi | 67% | 2444 fps | 98% |
| Hodgdon H1000 | <<locked>> | 96% | 40,930 psi | 63% | 2493 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 50,198 psi | 77% | 2569 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,945 psi | 65% | 2484 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 44,831 psi | 69% | 2500 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 44,904 psi | 69% | 2526 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 43,888 psi | 68% | 2507 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,318 psi | 56% | 2343 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,984 psi | 85% | 2651 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 35,810 psi | 55% | 2470 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 40,857 psi | 63% | 2497 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 42% | 1453 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,271 psi | 79% | 2549 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,287 psi | 82% | 2579 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 39,291 psi | 60% | 2382 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,092 psi | 69% | 2470 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 38,522 psi | 59% | 2395 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 54,186 psi | 83% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 43,903 psi | 68% | 2470 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 92% | 42,685 psi | 66% | 2546 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 51,590 psi | 79% | 2543 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,815 psi | 66% | 2428 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 41,031 psi | 63% | 2415 fps | 98.1% |
| Lovex S071 | <<locked>> | 86% | 31,053 psi | 48% | 2234 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 52,156 psi | 80% | 2595 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,841 psi | 60% | 2408 fps | 95.4% |
| Norma MRP | 50.1 gr | 82% | 32,967 psi | 51% | 2365 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 39,798 psi | 61% | 2431 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 80% | 52,504 psi | 81% | 2618 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,511 psi | 65% | 2556 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 38,493 psi | 59% | 2421 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 90% | 35,244 psi | 54% | 2385 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,036 psi | 43% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,169 psi | 77% | 2559 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,992 psi | 72% | 2602 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,842 psi | 61% | 2457 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,363 psi | 59% | 2464 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,998 psi | 54% | 2451 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 53,388 psi | 82% | 2552 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,239 psi | 73% | 2510 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,786 psi | 66% | 2457 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 37,463 psi | 58% | 2402 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 43,729 psi | 67% | 2444 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,815 psi | 66% | 2428 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 51,590 psi | 79% | 2543 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,031 psi | 63% | 2415 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,240 psi | 74% | 2559 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,950 psi | 74% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,814 psi | 64% | 2379 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,115 psi | 57% | 2395 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 47,398 psi | 73% | 2507 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,456 psi | 71% | 2500 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 36,230 psi | 56% | 2392 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,839 psi | 55% | 2339 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 53,795 psi | 83% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,969 psi | 83% | 2526 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,237 psi | 70% | 2438 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,191 psi | 63% | 2428 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,215 psi | 54% | 2320 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 52,069 psi | 80% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,553 psi | 62% | 2431 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 31,908 psi | 49% | 2300 fps | 98.3% |
| Vihtavuori N560 | 55 gr | 90% | 43,729 psi | 67% | 2582 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 96% | 43,047 psi | 66% | 2562 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,958 psi | 61% | 2395 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,206 psi | 65% | 2487 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,295 psi | 39% | 2218 fps | 97.9% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,246 psi | 57% | 2369 fps | 95.1% |
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 94 powders for .280 Ackley Improved loaded with the .284 | 175gr | Barnes Solid RN. Norma MRP delivers the highest muzzle velocity at 2,815 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,815 fps. Accurate 3100 gives the best case fill at 100 %, and 94 of the 94 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 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 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 | 175gr | Barnes Solid RN 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.