Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 184gr | Berger F-Open Hybrid Target 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.
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 2495 | <<locked>> | 82% | 58,581 psi | 90% | 2493 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,912 psi | 86% | 2536 fps | 99.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 58,102 psi | 89% | 2635 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,506 psi | 85% | 2507 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,623 psi | 87% | 2625 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,594 psi | 87% | 2726 fps | 98% |
| ADI AR 2208 | <<locked>> | 86% | 58,769 psi | 90% | 2585 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,334 psi | 88% | 2674 fps | 99.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 58,421 psi | 90% | 2726 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 42,743 psi | 66% | 2464 fps | 95.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,681 psi | 58% | 2425 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,246 psi | 87% | 2559 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,565 psi | 87% | 2585 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,058 psi | 88% | 2667 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 58,798 psi | 90% | 2690 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,681 psi | 87% | 2661 fps | 99.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 2720 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,868 psi | 84% | 2644 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,398 psi | 73% | 2595 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,853 psi | 84% | 2730 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 57,246 psi | 88% | 2638 fps | 96% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,982 psi | 82% | 2654 fps | 99.1% |
| Bofors RP3 | <<locked>> | 84% | 57,261 psi | 88% | 2579 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,279 psi | 67% | 2530 fps | 96.9% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 2720 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 56,231 psi | 87% | 2575 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,079 psi | 72% | 2546 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 84% | 57,406 psi | 88% | 2598 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 58,537 psi | 90% | 2674 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 58,044 psi | 89% | 2635 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 96% | 54,897 psi | 84% | 2618 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,537 psi | 89% | 2654 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,580 psi | 89% | 2595 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 58,813 psi | 90% | 2621 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,398 psi | 71% | 2641 fps | 99% |
| Hodgdon Superformance | <<locked>> | 88% | 54,694 psi | 84% | 2657 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 56% | 1575 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,262 psi | 90% | 2569 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,058 psi | 88% | 2559 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 57,334 psi | 88% | 2608 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,725 psi | 89% | 2595 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 56,942 psi | 88% | 2615 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,015 psi | 89% | 2605 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,521 psi | 87% | 2605 fps | 98.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,086 psi | 86% | 2703 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 58,537 psi | 90% | 2559 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,247 psi | 90% | 2595 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,028 psi | 86% | 2589 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,617 psi | 75% | 2507 fps | 99.8% |
| Norma 203B | <<locked>> | 82% | 55,883 psi | 86% | 2572 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,407 psi | 90% | 2664 fps | 99.5% |
| Norma MRP | <<locked>> | 98% | 57,551 psi | 89% | 2746 fps | 100% |
| Norma URP | <<locked>> | 92% | 58,537 psi | 90% | 2651 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,608 psi | 87% | 2595 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,652 psi | 87% | 2723 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 92% | 57,406 psi | 88% | 2661 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,720 psi | 78% | 2608 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,463 psi | 58% | 1614 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,232 psi | 88% | 2589 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,247 psi | 90% | 2677 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,347 psi | 87% | 2644 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 58,537 psi | 90% | 2723 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,369 psi | 71% | 2638 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 82% | 57,000 psi | 88% | 2523 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,421 psi | 88% | 2575 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 58,798 psi | 90% | 2641 fps | 99% |
| Rottweil R 905 | <<locked>> | 96% | 56,144 psi | 86% | 2651 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 88% | 56,231 psi | 87% | 2575 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,247 psi | 90% | 2595 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 58,537 psi | 90% | 2559 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,028 psi | 86% | 2589 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,158 psi | 85% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,986 psi | 89% | 2457 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,725 psi | 89% | 2552 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,680 psi | 86% | 2648 fps | 99.4% |
| Somchem S355 | <<locked>> | 86% | 57,276 psi | 88% | 2572 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,826 psi | 87% | 2589 fps | 98.1% |
| Somchem S365 | <<locked>> | 94% | 58,334 psi | 90% | 2651 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,681 psi | 87% | 2628 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 57,450 psi | 88% | 2477 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,406 psi | 88% | 2497 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 58,436 psi | 90% | 2543 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,188 psi | 88% | 2602 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,738 psi | 86% | 2602 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 82% | 55,767 psi | 86% | 2500 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,231 psi | 87% | 2608 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,392 psi | 88% | 2667 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,667 psi | 89% | 2740 fps | 98.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,574 psi | 76% | 2608 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,391 psi | 87% | 2566 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,042 psi | 85% | 2628 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,720 psi | 78% | 2720 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,710 psi | 87% | 2625 fps | 99.4% |
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% | 55,013 psi | 85% | 2451 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,330 psi | 81% | 2484 fps | 99.3% |
| Accurate 3100 | <<locked>> | 80% | 29,762 psi | 46% | 2146 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 52,214 psi | 80% | 2464 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,335 psi | 62% | 2375 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 92% | 45,847 psi | 71% | 2559 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 48,965 psi | 75% | 2451 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 36,376 psi | 56% | 2310 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 90% | 42,018 psi | 65% | 2454 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 98% | 40,074 psi | 62% | 2411 fps | 95% |
| ADI AR 2225 | <<locked>> | 96% | 33,402 psi | 51% | 2320 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,763 psi | 77% | 2474 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,924 psi | 81% | 2533 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,928 psi | 60% | 2382 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,324 psi | 68% | 2490 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 36,318 psi | 56% | 2310 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,318 psi | 56% | 2356 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,732 psi | 44% | 2175 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,645 psi | 44% | 2188 fps | 95.6% |
| Alliant Reloder-26 | 48.6 gr | 80% | 30,777 psi | 47% | 2283 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 53,838 psi | 83% | 2585 fps | 95.3% |
| Bofors RP15 | <<locked>> | 88% | 36,056 psi | 55% | 2346 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 50,241 psi | 77% | 2484 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 38,145 psi | 59% | 2425 fps | 95.2% |
| Bofors RP5 | <<locked>> | 86% | 36,318 psi | 56% | 2356 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 44,005 psi | 68% | 2382 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 94% | 38,624 psi | 59% | 2382 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 50,444 psi | 78% | 2500 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,163 psi | 65% | 2418 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 44,962 psi | 69% | 2431 fps | 98% |
| Hodgdon H4831 | <<locked>> | 90% | 45,092 psi | 69% | 2464 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,048 psi | 68% | 2444 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,535 psi | 56% | 2280 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 55,013 psi | 85% | 2575 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,042 psi | 55% | 2415 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 40,901 psi | 63% | 2434 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 42% | 1404 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,488 psi | 79% | 2480 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,708 psi | 83% | 2513 fps | 99.8% |
| IMR 4350 | <<locked>> | 80% | 39,624 psi | 61% | 2323 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,368 psi | 70% | 2408 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 38,609 psi | 59% | 2333 fps | 99.6% |
| IMR 4895 | <<locked>> | 80% | 54,317 psi | 84% | 2559 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,106 psi | 68% | 2411 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 90% | 40,263 psi | 62% | 2431 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 51,822 psi | 80% | 2474 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,815 psi | 66% | 2362 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 41,075 psi | 63% | 2349 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 29,240 psi | 45% | 2133 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 52,286 psi | 80% | 2523 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,073 psi | 60% | 2349 fps | 96% |
| Norma MRP | 48.4 gr | 82% | 33,272 psi | 51% | 2313 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 39,871 psi | 61% | 2365 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 80% | 52,982 psi | 82% | 2549 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 39,726 psi | 61% | 2434 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 38,711 psi | 60% | 2362 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 90% | 35,375 psi | 54% | 2329 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 43% | 1440 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,169 psi | 77% | 2487 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,065 psi | 72% | 2530 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,132 psi | 62% | 2395 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,711 psi | 60% | 2408 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 32,808 psi | 50% | 2336 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 53,621 psi | 82% | 2480 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,297 psi | 73% | 2438 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 40,277 psi | 62% | 2346 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 35,360 psi | 54% | 2293 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 44,005 psi | 68% | 2382 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,815 psi | 66% | 2362 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 51,822 psi | 80% | 2474 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,075 psi | 63% | 2349 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,501 psi | 75% | 2490 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,341 psi | 74% | 2339 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,887 psi | 64% | 2313 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 35,027 psi | 54% | 2287 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 47,384 psi | 73% | 2434 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 43,758 psi | 67% | 2388 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 36,579 psi | 56% | 2333 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,692 psi | 52% | 2231 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 54,215 psi | 83% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,012 psi | 83% | 2454 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,295 psi | 70% | 2369 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,292 psi | 64% | 2362 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 35,360 psi | 54% | 2264 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 52,257 psi | 80% | 2454 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,727 psi | 63% | 2369 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 31,966 psi | 49% | 2241 fps | 98.7% |
| Vihtavuori N560 | 53.1 gr | 90% | 44,019 psi | 68% | 2520 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 94% | 40,466 psi | 62% | 2448 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,350 psi | 62% | 2336 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,163 psi | 65% | 2418 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,440 psi | 39% | 2172 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,478 psi | 58% | 2313 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 93 powders for .280 Ackley Improved loaded with the .284 | 184gr | Berger F-Open Hybrid Target. Norma MRP delivers the highest muzzle velocity at 2,746 fps; across all powders the maximum-charge window runs from 1,575 fps to 2,746 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 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 184.0 gr projectile in 0.284" calls for a 1:9.0 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 | 184gr | Berger F-Open Hybrid Target 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.