Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 175gr | Swift A-Frame bullet and 92 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% | 58,755 psi | 90% | 2575 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,927 psi | 86% | 2612 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 58,465 psi | 90% | 2713 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,666 psi | 86% | 2585 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,695 psi | 87% | 2700 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,869 psi | 87% | 2808 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 84% | 55,317 psi | 85% | 2618 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,305 psi | 88% | 2749 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 98% | 55,158 psi | 85% | 2753 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,855 psi | 58% | 2493 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 58,813 psi | 90% | 2789 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,521 psi | 87% | 2641 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,536 psi | 87% | 2664 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,479 psi | 88% | 2753 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,868 psi | 84% | 2720 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,666 psi | 87% | 2740 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 58,262 psi | 90% | 2805 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,969 psi | 85% | 2720 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,703 psi | 73% | 2674 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,317 psi | 85% | 2812 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 57,450 psi | 88% | 2713 fps | 95.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,374 psi | 82% | 2733 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 57,363 psi | 88% | 2657 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,555 psi | 67% | 2602 fps | 96.6% |
| Bofors RP5ᴾ | <<locked>> | 100% | 58,262 psi | 90% | 2805 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 56,536 psi | 87% | 2654 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,239 psi | 73% | 2618 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 84% | 57,421 psi | 88% | 2677 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 58,740 psi | 90% | 2753 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 58,146 psi | 89% | 2713 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 96% | 55,056 psi | 85% | 2694 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,914 psi | 89% | 2733 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,856 psi | 89% | 2677 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,615 psi | 72% | 2717 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 88% | 55,158 psi | 85% | 2740 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 57% | 1634 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,247 psi | 90% | 2648 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,290 psi | 88% | 2641 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 57,580 psi | 89% | 2687 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,972 psi | 89% | 2677 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 56,884 psi | 88% | 2690 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,044 psi | 89% | 2687 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,492 psi | 87% | 2680 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,347 psi | 87% | 2782 fps | 98.6% |
| Lovex S062 | <<locked>> | 84% | 58,552 psi | 90% | 2638 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,407 psi | 90% | 2674 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,130 psi | 86% | 2667 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,675 psi | 75% | 2579 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 55,883 psi | 86% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 92% | 58,726 psi | 90% | 2746 fps | 99.4% |
| Norma MRP | <<locked>> | 98% | 57,754 psi | 89% | 2825 fps | 100% |
| Norma URP | <<locked>> | 90% | 55,158 psi | 85% | 2684 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,536 psi | 87% | 2674 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,000 psi | 88% | 2805 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 92% | 57,754 psi | 89% | 2743 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,923 psi | 78% | 2684 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,565 psi | 58% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,421 psi | 88% | 2667 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 58,291 psi | 90% | 2756 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,391 psi | 87% | 2723 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 58,682 psi | 90% | 2805 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,702 psi | 72% | 2713 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,188 psi | 88% | 2605 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,493 psi | 88% | 2654 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,419 psi | 85% | 2671 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 96% | 56,144 psi | 86% | 2730 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 56,536 psi | 87% | 2654 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,407 psi | 90% | 2674 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 58,552 psi | 90% | 2638 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,130 psi | 86% | 2667 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,405 psi | 85% | 2664 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,986 psi | 89% | 2536 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,827 psi | 89% | 2631 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,666 psi | 86% | 2723 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 57,130 psi | 88% | 2648 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,058 psi | 88% | 2667 fps | 97.9% |
| Somchem S365 | <<locked>> | 92% | 54,984 psi | 85% | 2687 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,840 psi | 87% | 2703 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 57,754 psi | 89% | 2559 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,740 psi | 89% | 2575 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 58,682 psi | 90% | 2625 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,246 psi | 88% | 2677 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,014 psi | 86% | 2680 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 55,651 psi | 86% | 2575 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,405 psi | 87% | 2687 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,682 psi | 89% | 2746 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,827 psi | 89% | 2818 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,676 psi | 76% | 2680 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,594 psi | 87% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,042 psi | 85% | 2703 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,865 psi | 78% | 2795 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,695 psi | 87% | 2697 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% | 55,288 psi | 85% | 2533 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,504 psi | 81% | 2559 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 29,878 psi | 46% | 2208 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 52,431 psi | 81% | 2543 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,422 psi | 62% | 2444 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 92% | 45,963 psi | 71% | 2628 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 48,921 psi | 75% | 2526 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,899 psi | 60% | 2431 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 42,235 psi | 65% | 2526 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 33,533 psi | 52% | 2382 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 54,940 psi | 85% | 2736 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,705 psi | 76% | 2546 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,055 psi | 82% | 2615 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,131 psi | 60% | 2454 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,483 psi | 68% | 2566 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,754 psi | 60% | 2428 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,492 psi | 56% | 2421 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,863 psi | 44% | 2238 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,747 psi | 44% | 2247 fps | 95.1% |
| Alliant Reloder-26 | 50.7 gr | 80% | 30,806 psi | 47% | 2346 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,114 psi | 83% | 2664 fps | 95% |
| Bofors RP15 | <<locked>> | 90% | 38,508 psi | 59% | 2464 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 50,299 psi | 77% | 2559 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,741 psi | 63% | 2546 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 36,492 psi | 56% | 2421 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 43,961 psi | 68% | 2451 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 41,249 psi | 63% | 2503 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 50,459 psi | 78% | 2575 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,163 psi | 65% | 2487 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 45,034 psi | 69% | 2507 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 45,034 psi | 69% | 2530 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,266 psi | 68% | 2516 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,782 psi | 57% | 2352 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,158 psi | 56% | 2480 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 41,046 psi | 63% | 2503 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 42% | 1457 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,488 psi | 79% | 2552 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,766 psi | 83% | 2592 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 39,711 psi | 61% | 2392 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,281 psi | 70% | 2477 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 38,740 psi | 60% | 2402 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 54,418 psi | 84% | 2638 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,034 psi | 68% | 2477 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 43,091 psi | 66% | 2556 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 51,822 psi | 80% | 2549 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,018 psi | 66% | 2434 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 41,249 psi | 63% | 2421 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 29,356 psi | 45% | 2195 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 52,388 psi | 81% | 2598 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,030 psi | 60% | 2415 fps | 95.6% |
| Norma MRP | 50.5 gr | 82% | 33,330 psi | 51% | 2375 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 40,045 psi | 62% | 2438 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 53,040 psi | 82% | 2628 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 40,089 psi | 62% | 2510 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 38,696 psi | 60% | 2428 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 35,578 psi | 55% | 2395 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 43% | 1493 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,372 psi | 77% | 2562 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,253 psi | 73% | 2608 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,248 psi | 62% | 2467 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,740 psi | 60% | 2477 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 35,273 psi | 54% | 2461 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 53,650 psi | 83% | 2559 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,485 psi | 73% | 2513 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,946 psi | 66% | 2464 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 37,884 psi | 58% | 2411 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 43,961 psi | 68% | 2451 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,018 psi | 66% | 2434 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 51,822 psi | 80% | 2549 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,249 psi | 63% | 2421 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,457 psi | 75% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,196 psi | 74% | 2408 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,003 psi | 65% | 2385 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,536 psi | 58% | 2408 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 47,616 psi | 73% | 2513 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 43,947 psi | 68% | 2457 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,724 psi | 56% | 2402 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,736 psi | 52% | 2293 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 54,070 psi | 83% | 2516 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,201 psi | 83% | 2533 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,455 psi | 70% | 2444 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,423 psi | 64% | 2434 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,389 psi | 54% | 2326 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 52,257 psi | 80% | 2530 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,727 psi | 63% | 2438 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 32,155 psi | 49% | 2306 fps | 98.4% |
| Vihtavuori N560 | 55.4 gr | 90% | 44,106 psi | 68% | 2589 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 43,424 psi | 67% | 2569 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,350 psi | 62% | 2405 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,395 psi | 65% | 2493 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,440 psi | 39% | 2228 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,652 psi | 58% | 2379 fps | 95.3% |
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 | 175gr | Swift A-Frame. Norma MRP delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,634 fps to 2,825 fps. Accurate 3100 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 57–90 %, 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 2225, Alliant Reloder-22 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 | Swift A-Frame 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.