Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 195gr | Berger Elite Hunter bullet and 92 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Norma MRP 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.
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% | 57,029 psi | 88% | 2470 fps | 99.9% |
| Accurate 3100 | <<locked>> | 98% | 56,130 psi | 86% | 2530 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,898 psi | 88% | 2441 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 58,015 psi | 89% | 2556 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 58,305 psi | 90% | 2674 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 84% | 56,536 psi | 87% | 2477 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,129 psi | 85% | 2562 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 98% | 56,057 psi | 86% | 2615 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,990 psi | 68% | 2418 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,899 psi | 60% | 2388 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,564 psi | 85% | 2566 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,564 psi | 85% | 2566 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,667 psi | 89% | 2497 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,624 psi | 89% | 2516 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 58,740 psi | 90% | 2605 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,492 psi | 87% | 2579 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 58,175 psi | 89% | 2602 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,535 psi | 85% | 2612 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,594 psi | 87% | 2582 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,921 psi | 75% | 2543 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,753 psi | 87% | 2667 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 58,537 psi | 90% | 2582 fps | 96.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,636 psi | 84% | 2598 fps | 99.6% |
| Bofors RP3 | <<locked>> | 84% | 58,537 psi | 90% | 2510 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,831 psi | 69% | 2484 fps | 97.8% |
| Bofors RP5 | <<locked>> | 98% | 55,535 psi | 85% | 2612 fps | 99.7% |
| Bofors RP7 | <<locked>> | 88% | 57,450 psi | 88% | 2510 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,240 psi | 74% | 2493 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 84% | 58,639 psi | 90% | 2530 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 56,260 psi | 87% | 2562 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 55,608 psi | 86% | 2523 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 96% | 56,449 psi | 87% | 2562 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,143 psi | 85% | 2546 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,506 psi | 85% | 2490 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,964 psi | 74% | 2595 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 88% | 56,347 psi | 87% | 2598 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 57% | 1522 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,970 psi | 86% | 2457 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 58,349 psi | 90% | 2497 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,332 psi | 85% | 2503 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,709 psi | 86% | 2490 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 58,247 psi | 90% | 2546 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,841 psi | 89% | 2546 fps | 98.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,551 psi | 89% | 2648 fps | 99.3% |
| Lovex S062 | <<locked>> | 82% | 56,333 psi | 87% | 2451 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,057 psi | 86% | 2484 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 57,377 psi | 88% | 2526 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,082 psi | 77% | 2451 fps | 100% |
| Norma 203B | <<locked>> | 82% | 56,942 psi | 88% | 2500 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,115 psi | 86% | 2552 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 34,330 psi | 53% | 2316 fps | 96.7% |
| Norma MRP | <<locked>> | 96% | 55,477 psi | 85% | 2635 fps | 100% |
| Norma URP | <<locked>> | 90% | 56,521 psi | 87% | 2543 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,986 psi | 89% | 2530 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 58,392 psi | 90% | 2667 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 90% | 55,317 psi | 85% | 2552 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,054 psi | 80% | 2552 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,681 psi | 58% | 1562 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 58,494 psi | 90% | 2523 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,854 psi | 86% | 2562 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,856 psi | 89% | 2582 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,202 psi | 86% | 2612 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,921 psi | 74% | 2592 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 82% | 58,175 psi | 89% | 2457 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 58,740 psi | 90% | 2507 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,507 psi | 87% | 2533 fps | 99% |
| Rottweil R 905 | <<locked>> | 96% | 57,319 psi | 88% | 2589 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 88% | 57,450 psi | 88% | 2510 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,057 psi | 86% | 2484 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,333 psi | 87% | 2451 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,377 psi | 88% | 2526 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,463 psi | 87% | 2516 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,593 psi | 86% | 2349 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,187 psi | 85% | 2444 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,855 psi | 87% | 2585 fps | 99.7% |
| Somchem S355 | <<locked>> | 86% | 58,450 psi | 90% | 2503 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 58,059 psi | 89% | 2530 fps | 98.7% |
| Somchem S365 | <<locked>> | 92% | 56,463 psi | 87% | 2546 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,899 psi | 89% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 58,682 psi | 90% | 2428 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 56,072 psi | 86% | 2434 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 58,392 psi | 90% | 2533 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,435 psi | 88% | 2546 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 82% | 56,797 psi | 87% | 2431 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,464 psi | 88% | 2543 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,448 psi | 85% | 2559 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,579 psi | 86% | 2631 fps | 98.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,126 psi | 79% | 2556 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,914 psi | 89% | 2500 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,579 psi | 87% | 2566 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 52,866 psi | 81% | 2657 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 58,131 psi | 89% | 2562 fps | 99.7% |
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% | 53,316 psi | 82% | 2421 fps | 99.7% |
| Accurate 3100 | <<locked>> | 80% | 30,734 psi | 47% | 2103 fps | 96.8% |
| Accurate 4064 | <<locked>> | 80% | 53,417 psi | 82% | 2398 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,553 psi | 64% | 2323 fps | 99.9% |
| Accurate MAGPRO | 52.9 gr | 90% | 44,121 psi | 68% | 2454 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 49,937 psi | 77% | 2388 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,027 psi | 54% | 2215 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 88% | 40,524 psi | 62% | 2356 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 96% | 38,638 psi | 59% | 2313 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 92% | 30,240 psi | 47% | 2175 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,389 psi | 54% | 2221 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,389 psi | 54% | 2221 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,908 psi | 78% | 2408 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,143 psi | 83% | 2470 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,161 psi | 62% | 2333 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,788 psi | 70% | 2434 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 34,853 psi | 54% | 2211 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 84% | 35,056 psi | 54% | 2257 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,544 psi | 45% | 2129 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 27,731 psi | 43% | 2100 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,705 psi | 49% | 2241 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 51,648 psi | 79% | 2480 fps | 95.4% |
| Bofors RP15 | <<locked>> | 86% | 34,809 psi | 54% | 2251 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 51,517 psi | 79% | 2421 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 36,666 psi | 56% | 2326 fps | 95.4% |
| Bofors RP5 | <<locked>> | 84% | 35,056 psi | 54% | 2257 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 44,976 psi | 69% | 2326 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 92% | 36,927 psi | 57% | 2280 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 51,721 psi | 80% | 2441 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,395 psi | 67% | 2369 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 46,122 psi | 71% | 2379 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 40,538 psi | 62% | 2310 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 42,496 psi | 65% | 2346 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,782 psi | 58% | 2231 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 34,751 psi | 53% | 2320 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 42,119 psi | 65% | 2385 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,615 psi | 42% | 1358 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,562 psi | 81% | 2415 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,592 psi | 84% | 2448 fps | 99.9% |
| IMR 4350 | <<locked>> | 80% | 40,553 psi | 62% | 2270 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,340 psi | 71% | 2349 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 39,682 psi | 61% | 2277 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 39,900 psi | 61% | 2260 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 88% | 38,624 psi | 59% | 2329 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 52,939 psi | 81% | 2408 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,801 psi | 67% | 2306 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 42,076 psi | 65% | 2297 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 28,398 psi | 44% | 2047 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 53,534 psi | 82% | 2457 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,205 psi | 62% | 2300 fps | 96.9% |
| Norma 217 | <<locked>> | 98% | 32,213 psi | 50% | 2264 fps | 95.7% |
| Norma MRP | 46.1 gr | 80% | 31,879 psi | 49% | 2211 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 40,944 psi | 63% | 2313 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 80% | 54,172 psi | 83% | 2484 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 38,174 psi | 59% | 2336 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 39,900 psi | 61% | 2313 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 31,734 psi | 49% | 2182 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,224 psi | 43% | 1394 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,474 psi | 79% | 2428 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,588 psi | 75% | 2470 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,234 psi | 63% | 2343 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,726 psi | 61% | 2356 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 31,560 psi | 49% | 2241 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 54,650 psi | 84% | 2415 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 48,472 psi | 75% | 2375 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 38,798 psi | 60% | 2247 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 34,098 psi | 52% | 2198 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,976 psi | 69% | 2326 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,801 psi | 67% | 2306 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 52,939 psi | 81% | 2408 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,076 psi | 65% | 2297 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,806 psi | 77% | 2431 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,255 psi | 76% | 2274 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,888 psi | 66% | 2260 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,779 psi | 52% | 2192 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 48,457 psi | 75% | 2372 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 41,872 psi | 64% | 2283 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 37,768 psi | 58% | 2277 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,664 psi | 53% | 2185 fps | 96.5% |
| Vihtavuori N140 | <<locked>> | 80% | 55,172 psi | 85% | 2388 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 46,383 psi | 71% | 2306 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,424 psi | 65% | 2310 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 34,055 psi | 52% | 2169 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 53,461 psi | 82% | 2388 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,858 psi | 64% | 2316 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 32,996 psi | 51% | 2195 fps | 99.3% |
| Vihtavuori N560 | 49.6 gr | 86% | 39,595 psi | 61% | 2362 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 92% | 38,957 psi | 60% | 2349 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,336 psi | 64% | 2280 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,395 psi | 67% | 2369 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,266 psi | 40% | 2142 fps | 99.4% |
| Winchester Supreme 780 | <<locked>> | 82% | 33,808 psi | 52% | 2169 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 | 195gr | Berger Elite Hunter. Accurate MAGPRO delivers the highest muzzle velocity at 2,674 fps; across all powders the maximum-charge window runs from 1,522 fps to 2,674 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 53–90 %, leaving at least 10 % headroom. The 195.0 gr projectile in 0.284" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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. Vihtavuori N560, Norma MRP, Accurate MAGPRO rank at the top here: for .280 Ackley Improved with the .284 | 195gr | Berger Elite Hunter 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.