Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 177gr | Brenneke TIG bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Accurate MAGPRO and Alliant Reloder-26.
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% | 57,812 psi | 89% | 2638 fps | 99.8% |
| Accurate 3100 | <<locked>> | 98% | 57,421 psi | 88% | 2697 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 58,001 psi | 89% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,492 psi | 85% | 2680 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,898 psi | 86% | 2789 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 84% | 57,348 psi | 88% | 2644 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,043 psi | 86% | 2730 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 98% | 57,406 psi | 88% | 2789 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,802 psi | 69% | 2572 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,682 psi | 61% | 2536 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,188 psi | 86% | 2726 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,188 psi | 86% | 2726 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 58,392 psi | 90% | 2661 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 58,436 psi | 90% | 2684 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,318 psi | 87% | 2733 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,435 psi | 88% | 2746 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,463 psi | 85% | 2717 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,913 psi | 88% | 2779 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 58,001 psi | 89% | 2753 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,154 psi | 77% | 2707 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 58,769 psi | 90% | 2848 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 55,970 psi | 86% | 2694 fps | 95.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 2766 fps | 99.4% |
| Bofors RP3 | <<locked>> | 82% | 55,927 psi | 86% | 2635 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,006 psi | 71% | 2644 fps | 97.6% |
| Bofors RP5 | <<locked>> | 98% | 56,913 psi | 88% | 2779 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 58,465 psi | 90% | 2680 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,400 psi | 76% | 2657 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 82% | 55,898 psi | 86% | 2651 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,334 psi | 88% | 2733 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 56,536 psi | 87% | 2690 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 96% | 57,682 psi | 89% | 2730 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,420 psi | 87% | 2713 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,579 psi | 87% | 2657 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,965 psi | 75% | 2759 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 88% | 57,696 psi | 89% | 2772 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,840 psi | 57% | 1637 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,797 psi | 87% | 2625 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,173 psi | 86% | 2667 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,565 psi | 87% | 2654 fps | 99.9% |
| IMR 4831 | <<locked>> | 90% | 55,927 psi | 86% | 2674 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 58,653 psi | 90% | 2710 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 98% | 54,911 psi | 84% | 2762 fps | 98.7% |
| Lovex S062 | <<locked>> | 82% | 57,159 psi | 88% | 2615 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,811 psi | 87% | 2651 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 58,349 psi | 90% | 2694 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,140 psi | 79% | 2612 fps | 99.9% |
| Norma 203B | <<locked>> | 82% | 57,783 psi | 89% | 2671 fps | 100% |
| Norma 204 | <<locked>> | 90% | 57,130 psi | 88% | 2723 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 35,346 psi | 54% | 2464 fps | 96.3% |
| Norma MRP | <<locked>> | 96% | 56,811 psi | 87% | 2805 fps | 100% |
| Norma URP | <<locked>> | 90% | 57,522 psi | 88% | 2713 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,796 psi | 86% | 2785 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 56,362 psi | 87% | 2720 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,722 psi | 83% | 2723 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,623 psi | 58% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,564 psi | 85% | 2641 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,203 psi | 88% | 2736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,477 psi | 85% | 2703 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,464 psi | 88% | 2782 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,095 psi | 76% | 2756 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 82% | 58,798 psi | 90% | 2621 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 56,101 psi | 86% | 2631 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,493 psi | 88% | 2700 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 96% | 58,697 psi | 90% | 2762 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 88% | 58,465 psi | 90% | 2680 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,811 psi | 87% | 2651 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,159 psi | 88% | 2615 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 58,349 psi | 90% | 2694 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,450 psi | 88% | 2687 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,434 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% | 58,218 psi | 90% | 2756 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 55,709 psi | 86% | 2625 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,622 psi | 86% | 2648 fps | 98% |
| Somchem S365 | <<locked>> | 92% | 57,551 psi | 89% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,666 psi | 86% | 2687 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 86% | 57,014 psi | 88% | 2598 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,956 psi | 86% | 2657 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 58,639 psi | 90% | 2713 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 82% | 57,624 psi | 89% | 2595 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 58,639 psi | 90% | 2710 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,710 psi | 87% | 2730 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,797 psi | 87% | 2799 fps | 98.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,547 psi | 81% | 2723 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,390 psi | 85% | 2621 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,667 psi | 89% | 2736 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,636 psi | 84% | 2831 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,492 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% | 54,085 psi | 83% | 2582 fps | 99.5% |
| Accurate 3100 | <<locked>> | 80% | 31,343 psi | 48% | 2238 fps | 96.3% |
| Accurate 4064 | <<locked>> | 80% | 54,505 psi | 84% | 2566 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,308 psi | 65% | 2474 fps | 99.9% |
| Accurate MAGPRO | 58.3 gr | 90% | 45,252 psi | 70% | 2612 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 50,705 psi | 78% | 2549 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,029 psi | 59% | 2411 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 88% | 41,249 psi | 63% | 2507 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 98% | 41,959 psi | 65% | 2516 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 94% | 32,982 psi | 51% | 2369 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,766 psi | 55% | 2356 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,766 psi | 55% | 2356 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,576 psi | 79% | 2569 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 54,955 psi | 85% | 2638 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,857 psi | 63% | 2487 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,644 psi | 72% | 2592 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 37,768 psi | 58% | 2405 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 84% | 35,781 psi | 55% | 2402 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,269 psi | 47% | 2270 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 28,253 psi | 43% | 2231 fps | 95.3% |
| Alliant Reloder-26 | 52.4 gr | 80% | 32,547 psi | 50% | 2388 fps | 98.2% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 52,591 psi | 81% | 2641 fps | 95.1% |
| Bofors RP15 | <<locked>> | 88% | 37,913 psi | 58% | 2448 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 52,460 psi | 81% | 2585 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 37,594 psi | 58% | 2474 fps | 95% |
| Bofors RP5 | <<locked>> | 84% | 35,781 psi | 55% | 2402 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 45,585 psi | 70% | 2480 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 37,855 psi | 58% | 2431 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 52,504 psi | 81% | 2602 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,092 psi | 68% | 2523 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 46,934 psi | 72% | 2536 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 88% | 44,005 psi | 68% | 2510 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 43,265 psi | 67% | 2497 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,319 psi | 59% | 2379 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 35,491 psi | 55% | 2464 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 43,062 psi | 66% | 2539 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 42% | 1460 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,330 psi | 82% | 2579 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,234 psi | 63% | 2421 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,876 psi | 72% | 2503 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 40,437 psi | 62% | 2428 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 43,149 psi | 66% | 2461 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 90% | 42,337 psi | 65% | 2543 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 53,751 psi | 83% | 2572 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,643 psi | 69% | 2461 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 42,859 psi | 66% | 2451 fps | 98.7% |
| Lovex S071 | <<locked>> | 82% | 28,848 psi | 44% | 2175 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 54,302 psi | 84% | 2621 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,785 psi | 63% | 2448 fps | 96.5% |
| Norma 217 | <<locked>> | 98% | 33,127 psi | 51% | 2408 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 32,561 psi | 50% | 2352 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 41,785 psi | 64% | 2467 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 39,175 psi | 60% | 2490 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 40,509 psi | 62% | 2461 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 88% | 34,824 psi | 54% | 2375 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 43% | 1496 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,301 psi | 80% | 2589 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,472 psi | 76% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,221 psi | 65% | 2497 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,495 psi | 62% | 2507 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 32,416 psi | 50% | 2385 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 55,535 psi | 85% | 2579 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 49,385 psi | 76% | 2539 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 41,916 psi | 64% | 2441 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 82% | 37,159 psi | 57% | 2392 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 45,585 psi | 70% | 2480 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,643 psi | 69% | 2461 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 53,751 psi | 83% | 2572 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,859 psi | 66% | 2451 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,488 psi | 78% | 2589 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,980 psi | 77% | 2431 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,540 psi | 67% | 2408 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 36,840 psi | 57% | 2388 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 49,458 psi | 76% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 42,772 psi | 66% | 2434 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 38,595 psi | 59% | 2431 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,375 psi | 54% | 2329 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 80% | 47,195 psi | 73% | 2464 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,120 psi | 66% | 2461 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 34,853 psi | 54% | 2313 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 54,215 psi | 83% | 2549 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,583 psi | 66% | 2467 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 33,823 psi | 52% | 2339 fps | 99.1% |
| Vihtavuori N560 | 55.9 gr | 88% | 43,207 psi | 66% | 2569 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 40,118 psi | 62% | 2500 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,003 psi | 65% | 2428 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,092 psi | 68% | 2523 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,716 psi | 41% | 2270 fps | 99% |
| Winchester Supreme 780 | <<locked>> | 84% | 36,767 psi | 57% | 2359 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 89 powders for .280 Ackley Improved loaded with the .284 | 177gr | Brenneke TIG. Alliant Reloder-26 delivers the highest muzzle velocity at 2,848 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,848 fps. ADI AR 2217 gives the best case fill at 100 %, and 89 of the 89 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. Vihtavuori N560, Accurate MAGPRO, Alliant Reloder-26 rank at the top here: for .280 Ackley Improved with the .284 | 177gr | Brenneke TIG 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.