Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 177gr | RWS ID Classic bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, 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% | 57,870 psi | 89% | 2638 fps | 99.8% |
| Accurate 3100 | <<locked>> | 98% | 57,464 psi | 88% | 2700 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 58,073 psi | 89% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,564 psi | 85% | 2684 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,912 psi | 86% | 2792 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 84% | 57,421 psi | 88% | 2644 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,362 psi | 87% | 2733 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 98% | 57,696 psi | 89% | 2792 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,049 psi | 69% | 2579 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,929 psi | 61% | 2543 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 58,421 psi | 90% | 2664 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 58,813 psi | 90% | 2690 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,347 psi | 87% | 2733 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,798 psi | 89% | 2749 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,811 psi | 86% | 2723 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,290 psi | 88% | 2785 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 58,015 psi | 89% | 2753 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,154 psi | 77% | 2710 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 58,813 psi | 90% | 2848 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 56,217 psi | 86% | 2700 fps | 96% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,086 psi | 86% | 2769 fps | 99.5% |
| Bofors RP3 | <<locked>> | 82% | 56,014 psi | 86% | 2635 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,282 psi | 71% | 2648 fps | 97.6% |
| Bofors RP5 | <<locked>> | 98% | 57,290 psi | 88% | 2785 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 58,465 psi | 90% | 2680 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,429 psi | 76% | 2661 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 82% | 56,260 psi | 87% | 2657 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,392 psi | 88% | 2733 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 56,869 psi | 87% | 2697 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 96% | 57,696 psi | 89% | 2733 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,434 psi | 87% | 2713 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,623 psi | 87% | 2657 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,284 psi | 76% | 2766 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 88% | 58,015 psi | 89% | 2776 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,970 psi | 57% | 1640 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,840 psi | 87% | 2628 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,202 psi | 86% | 2667 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,637 psi | 87% | 2657 fps | 99.9% |
| IMR 4831 | <<locked>> | 90% | 55,999 psi | 86% | 2674 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,448 psi | 85% | 2667 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 98% | 55,274 psi | 85% | 2769 fps | 98.7% |
| Lovex S062 | <<locked>> | 82% | 57,203 psi | 88% | 2618 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,087 psi | 88% | 2654 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 58,378 psi | 90% | 2697 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,169 psi | 79% | 2612 fps | 99.9% |
| Norma 203B | <<locked>> | 82% | 58,102 psi | 89% | 2674 fps | 100% |
| Norma 204 | <<locked>> | 90% | 57,174 psi | 88% | 2723 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 35,389 psi | 54% | 2467 fps | 96.4% |
| Norma MRP | <<locked>> | 96% | 57,130 psi | 88% | 2812 fps | 100% |
| Norma URP | <<locked>> | 90% | 57,566 psi | 89% | 2713 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,840 psi | 86% | 2789 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 90% | 56,405 psi | 87% | 2723 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,693 psi | 83% | 2726 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,753 psi | 58% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,869 psi | 86% | 2644 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,232 psi | 88% | 2736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,535 psi | 85% | 2707 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,508 psi | 88% | 2785 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,400 psi | 76% | 2762 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 84% | 56,159 psi | 86% | 2631 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,812 psi | 89% | 2703 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 94% | 55,332 psi | 85% | 2713 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 88% | 58,465 psi | 90% | 2680 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,087 psi | 88% | 2654 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,203 psi | 88% | 2618 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 58,378 psi | 90% | 2697 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,798 psi | 89% | 2690 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,478 psi | 87% | 2513 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,231 psi | 87% | 2608 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 58,537 psi | 90% | 2762 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 56,043 psi | 86% | 2631 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,608 psi | 86% | 2648 fps | 98% |
| Somchem S365 | <<locked>> | 92% | 57,914 psi | 89% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,695 psi | 86% | 2687 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 86% | 57,087 psi | 88% | 2602 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,999 psi | 86% | 2657 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,984 psi | 85% | 2667 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 82% | 57,972 psi | 89% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 58,697 psi | 90% | 2713 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,058 psi | 88% | 2733 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,130 psi | 88% | 2805 fps | 98.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,562 psi | 81% | 2723 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,434 psi | 85% | 2625 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,725 psi | 89% | 2736 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,679 psi | 84% | 2831 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,535 psi | 85% | 2680 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% | 54,418 psi | 84% | 2589 fps | 99.6% |
| Accurate 3100 | <<locked>> | 80% | 31,415 psi | 48% | 2241 fps | 96.4% |
| Accurate 4064 | <<locked>> | 80% | 54,578 psi | 84% | 2566 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,380 psi | 65% | 2477 fps | 99.9% |
| Accurate MAGPRO | 58.4 gr | 90% | 45,295 psi | 70% | 2615 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 50,749 psi | 78% | 2552 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,072 psi | 59% | 2411 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 88% | 41,307 psi | 64% | 2507 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 98% | 42,221 psi | 65% | 2523 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 94% | 33,025 psi | 51% | 2372 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,648 psi | 79% | 2572 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,998 psi | 85% | 2638 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,901 psi | 63% | 2487 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,717 psi | 72% | 2595 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,043 psi | 59% | 2411 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 84% | 35,839 psi | 55% | 2402 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,313 psi | 47% | 2274 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 28,311 psi | 44% | 2231 fps | 95.4% |
| Alliant Reloder-26 | 52.5 gr | 80% | 32,619 psi | 50% | 2388 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 52,852 psi | 81% | 2648 fps | 95.2% |
| Bofors RP15 | <<locked>> | 88% | 37,956 psi | 58% | 2451 fps | 95.9% |
| Bofors RP3 | <<locked>> | 80% | 52,562 psi | 81% | 2589 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 37,826 psi | 58% | 2480 fps | 95.1% |
| Bofors RP5 | <<locked>> | 84% | 35,839 psi | 55% | 2402 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 45,629 psi | 70% | 2480 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 37,855 psi | 58% | 2431 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 52,591 psi | 81% | 2605 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,179 psi | 68% | 2523 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 46,978 psi | 72% | 2539 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 88% | 44,280 psi | 68% | 2516 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 43,323 psi | 67% | 2500 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,377 psi | 59% | 2379 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 35,534 psi | 55% | 2467 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 43,120 psi | 66% | 2539 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 43% | 1467 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,432 psi | 82% | 2579 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,307 psi | 64% | 2421 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,181 psi | 73% | 2510 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 40,524 psi | 62% | 2428 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,178 psi | 66% | 2461 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 90% | 42,366 psi | 65% | 2543 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 53,795 psi | 83% | 2572 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,701 psi | 69% | 2464 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 42,917 psi | 66% | 2451 fps | 98.7% |
| Lovex S071 | <<locked>> | 82% | 28,921 psi | 44% | 2178 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 54,346 psi | 84% | 2625 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,857 psi | 63% | 2451 fps | 96.6% |
| Norma 217 | <<locked>> | 98% | 33,170 psi | 51% | 2411 fps | 95.3% |
| Norma MRP | 51 gr | 80% | 32,808 psi | 50% | 2359 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 41,843 psi | 64% | 2467 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 39,218 psi | 60% | 2490 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 40,582 psi | 62% | 2464 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 88% | 34,853 psi | 54% | 2379 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,268 psi | 43% | 1499 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,315 psi | 80% | 2592 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,574 psi | 76% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,308 psi | 65% | 2500 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,538 psi | 62% | 2510 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 32,416 psi | 50% | 2385 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 49,429 psi | 76% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 39,610 psi | 61% | 2398 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 82% | 37,217 psi | 57% | 2395 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 45,629 psi | 70% | 2480 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,701 psi | 69% | 2464 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 53,795 psi | 83% | 2572 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,917 psi | 66% | 2451 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,575 psi | 78% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,038 psi | 77% | 2431 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,555 psi | 67% | 2411 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 36,869 psi | 57% | 2388 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 49,501 psi | 76% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 42,786 psi | 66% | 2438 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 38,638 psi | 59% | 2431 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,447 psi | 55% | 2329 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 80% | 47,282 psi | 73% | 2467 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,178 psi | 66% | 2464 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 34,896 psi | 54% | 2313 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 54,302 psi | 84% | 2552 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,641 psi | 66% | 2467 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 33,924 psi | 52% | 2343 fps | 99.1% |
| Vihtavuori N560 | <<locked>> | 88% | 43,482 psi | 67% | 2579 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 92% | 40,147 psi | 62% | 2503 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,235 psi | 65% | 2434 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,382 psi | 68% | 2526 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,760 psi | 41% | 2270 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 84% | 36,985 psi | 57% | 2362 fps | 95.5% |
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 | 177gr | RWS ID Classic. Alliant Reloder-26 delivers the highest muzzle velocity at 2,848 fps; across all powders the maximum-charge window runs from 1,640 fps to 2,848 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 54–90 %, leaving at least 10 % headroom. The 177.0 gr projectile in 0.284" calls for a 1:11.5 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. Accurate MAGPRO, Alliant Reloder-26, Norma MRP rank at the top here: for .280 Ackley Improved with the .284 | 177gr | RWS ID Classic they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 7977 Enduron, IMR 8133 Enduron, Vihtavuori N170 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.