Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 173gr | Sellier & Bellot SPCE bullet and 91 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Accurate MAGPRO.
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% | 56,463 psi | 87% | 2638 fps | 99.6% |
| Accurate 3100 | <<locked>> | 98% | 55,477 psi | 85% | 2694 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,376 psi | 87% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,276 psi | 88% | 2730 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 57,653 psi | 89% | 2838 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 84% | 55,956 psi | 86% | 2648 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,943 psi | 89% | 2779 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 98% | 55,637 psi | 86% | 2782 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,406 psi | 59% | 2523 fps | 97.6% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 58,349 psi | 90% | 2779 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,869 psi | 87% | 2667 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,942 psi | 88% | 2687 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 58,015 psi | 89% | 2779 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,709 psi | 86% | 2749 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,537 psi | 89% | 2772 fps | 99.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 58,755 psi | 90% | 2831 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,941 psi | 86% | 2753 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,196 psi | 74% | 2700 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,173 psi | 86% | 2841 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 57,943 psi | 89% | 2743 fps | 95.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,911 psi | 83% | 2759 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 57,972 psi | 89% | 2687 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,266 psi | 68% | 2631 fps | 96.8% |
| Bofors RP5ᴾ | <<locked>> | 100% | 58,755 psi | 90% | 2831 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 57,043 psi | 88% | 2684 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,645 psi | 73% | 2648 fps | 97.6% |
| Hodgdon H380 | <<locked>> | 84% | 57,986 psi | 89% | 2703 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,521 psi | 85% | 2730 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 58,653 psi | 90% | 2740 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 96% | 55,927 psi | 86% | 2726 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 98% | 58,421 psi | 90% | 2762 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 58,378 psi | 90% | 2703 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,355 psi | 73% | 2749 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 88% | 55,811 psi | 86% | 2769 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 57% | 1650 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,347 psi | 85% | 2631 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,580 psi | 89% | 2667 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 58,001 psi | 89% | 2713 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,465 psi | 90% | 2703 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 57,696 psi | 89% | 2723 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,436 psi | 90% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,000 psi | 88% | 2710 fps | 98.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,840 psi | 87% | 2815 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 55,666 psi | 86% | 2621 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,390 psi | 85% | 2654 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,913 psi | 88% | 2697 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,342 psi | 76% | 2608 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 56,231 psi | 87% | 2674 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,361 psi | 85% | 2717 fps | 99% |
| Norma MRP | <<locked>> | 98% | 58,624 psi | 90% | 2854 fps | 100% |
| Norma URP | <<locked>> | 90% | 55,985 psi | 86% | 2717 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,087 psi | 88% | 2700 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,798 psi | 89% | 2838 fps | 99% |
| Ramshot Hunter | <<locked>> | 92% | 58,421 psi | 90% | 2772 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,561 psi | 79% | 2713 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 58% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,914 psi | 89% | 2694 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,056 psi | 85% | 2736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,130 psi | 88% | 2753 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,550 psi | 85% | 2782 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,224 psi | 73% | 2743 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,609 psi | 89% | 2631 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 58,146 psi | 89% | 2684 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,796 psi | 86% | 2697 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 96% | 56,739 psi | 87% | 2759 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 88% | 57,043 psi | 88% | 2684 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,390 psi | 85% | 2654 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,666 psi | 86% | 2621 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,913 psi | 88% | 2697 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,956 psi | 86% | 2694 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 58,363 psi | 90% | 2559 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 58,523 psi | 90% | 2661 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,304 psi | 87% | 2753 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 57,740 psi | 89% | 2677 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,537 psi | 89% | 2694 fps | 98% |
| Somchem S365 | <<locked>> | 92% | 55,448 psi | 85% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,450 psi | 88% | 2733 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 57,957 psi | 89% | 2582 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 58,146 psi | 89% | 2602 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,579 psi | 86% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,711 psi | 89% | 2707 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,840 psi | 87% | 2713 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 82% | 56,202 psi | 86% | 2602 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,840 psi | 87% | 2713 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 58,378 psi | 90% | 2776 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 58,624 psi | 90% | 2851 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,444 psi | 78% | 2713 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,493 psi | 88% | 2674 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,796 psi | 86% | 2733 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,851 psi | 80% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,493 psi | 88% | 2730 fps | 99.3% |
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% | 52,794 psi | 81% | 2585 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 30,211 psi | 46% | 2231 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 52,924 psi | 81% | 2572 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,857 psi | 63% | 2470 fps | 99.6% |
| Accurate MAGPRO | 58.8 gr | 92% | 46,543 psi | 72% | 2657 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 49,356 psi | 76% | 2552 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,349 psi | 61% | 2461 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 90% | 42,583 psi | 66% | 2552 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 96% | 33,910 psi | 52% | 2411 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 36,956 psi | 57% | 2405 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,140 psi | 77% | 2572 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,476 psi | 82% | 2638 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,523 psi | 61% | 2480 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,078 psi | 69% | 2592 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,059 psi | 60% | 2451 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,927 psi | 57% | 2448 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,182 psi | 45% | 2264 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 29,109 psi | 45% | 2274 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,227 psi | 48% | 2372 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,665 psi | 84% | 2690 fps | 95.1% |
| Bofors RP15 | <<locked>> | 90% | 39,117 psi | 60% | 2493 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 50,691 psi | 78% | 2585 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 38,798 psi | 60% | 2523 fps | 95% |
| Bofors RP5 | <<locked>> | 86% | 36,927 psi | 57% | 2448 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 44,324 psi | 68% | 2477 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 41,727 psi | 64% | 2533 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 51,082 psi | 79% | 2605 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,728 psi | 66% | 2516 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 45,397 psi | 70% | 2530 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 90% | 45,643 psi | 70% | 2562 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,657 psi | 69% | 2543 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,217 psi | 57% | 2379 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,463 psi | 56% | 2507 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 41,698 psi | 64% | 2536 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 42% | 1470 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,953 psi | 80% | 2582 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,128 psi | 83% | 2615 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 40,045 psi | 62% | 2415 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,890 psi | 71% | 2507 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 39,146 psi | 60% | 2425 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 54,882 psi | 84% | 2664 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,715 psi | 69% | 2510 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 92% | 43,642 psi | 67% | 2585 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 52,286 psi | 80% | 2575 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,410 psi | 67% | 2461 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 41,611 psi | 64% | 2448 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 29,675 psi | 46% | 2218 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 52,823 psi | 81% | 2625 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,566 psi | 61% | 2444 fps | 95.7% |
| Norma MRP | 51.5 gr | 82% | 33,736 psi | 52% | 2402 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 40,437 psi | 62% | 2464 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 53,577 psi | 82% | 2654 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 40,393 psi | 62% | 2533 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 39,218 psi | 60% | 2457 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 90% | 35,853 psi | 55% | 2418 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 43% | 1506 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,937 psi | 78% | 2592 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,863 psi | 74% | 2638 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,611 psi | 62% | 2490 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,233 psi | 60% | 2503 fps | 99.2% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,460 psi | 51% | 2428 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 54,114 psi | 83% | 2585 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,906 psi | 74% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 40,727 psi | 63% | 2438 fps | 95% |
| Rottweil R 905 | <<locked>> | 84% | 38,189 psi | 59% | 2434 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 44,324 psi | 68% | 2477 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,410 psi | 67% | 2461 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 52,286 psi | 80% | 2575 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,611 psi | 64% | 2448 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,081 psi | 76% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,675 psi | 75% | 2438 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,351 psi | 65% | 2408 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,840 psi | 58% | 2431 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 48,051 psi | 74% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 44,295 psi | 68% | 2484 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 37,144 psi | 57% | 2428 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,026 psi | 52% | 2316 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 54,621 psi | 84% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,607 psi | 84% | 2559 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,861 psi | 71% | 2467 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,785 psi | 64% | 2461 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,781 psi | 55% | 2352 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 52,866 psi | 81% | 2559 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,292 psi | 64% | 2464 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 32,547 psi | 50% | 2333 fps | 98.5% |
| Vihtavuori N560 | 56.5 gr | 90% | 44,715 psi | 69% | 2621 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 96% | 43,990 psi | 68% | 2598 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,785 psi | 63% | 2428 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,728 psi | 66% | 2516 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,788 psi | 40% | 2254 fps | 98.2% |
| Winchester Supreme 780 | <<locked>> | 86% | 38,043 psi | 59% | 2405 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 91 powders for .280 Ackley Improved loaded with the .284 | 173gr | Sellier & Bellot SPCE. Norma MRP delivers the highest muzzle velocity at 2,854 fps; across all powders the maximum-charge window runs from 1,650 fps to 2,854 fps. ADI AR 2225 gives the best case fill at 100 %, and 91 of the 91 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-22, Alliant Reloder-23 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .280 Ackley Improved with the .284 | 173gr | Sellier & Bellot SPCE 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.