Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 175gr | Nosler AccuBond Long Range bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 7828 SSC, Alliant Reloder-26 and ReloadSwiss RS 70.
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% | 57,885 psi | 89% | 2559 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 58,784 psi | 90% | 2644 fps | 99.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,029 psi | 88% | 2690 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 58,276 psi | 90% | 2615 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,767 psi | 86% | 2687 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 58,639 psi | 90% | 2841 fps | 99% |
| Accurate MAGPRO | <<locked>> | 98% | 55,593 psi | 86% | 2782 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 86% | 58,001 psi | 89% | 2651 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,231 psi | 87% | 2730 fps | 99.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,740 psi | 89% | 2785 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,202 psi | 57% | 2474 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,725 psi | 89% | 2769 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,362 psi | 87% | 2726 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,521 psi | 85% | 2625 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,564 psi | 85% | 2644 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,246 psi | 87% | 2733 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,725 psi | 89% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,593 psi | 86% | 2720 fps | 99.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,884 psi | 88% | 2779 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,853 psi | 83% | 2703 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,586 psi | 72% | 2651 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,841 psi | 89% | 2844 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,025 psi | 80% | 2710 fps | 98.7% |
| Bofors RP3 | <<locked>> | 84% | 56,376 psi | 87% | 2641 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 42,424 psi | 65% | 2575 fps | 96.1% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,884 psi | 88% | 2779 fps | 99.4% |
| Bofors RP7 | <<locked>> | 88% | 55,695 psi | 86% | 2638 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,195 psi | 71% | 2595 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 84% | 56,492 psi | 87% | 2661 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,566 psi | 89% | 2733 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 57,029 psi | 88% | 2690 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 98% | 57,928 psi | 89% | 2730 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,594 psi | 87% | 2710 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,652 psi | 87% | 2657 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,870 psi | 89% | 2687 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,788 psi | 70% | 2694 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 90% | 57,928 psi | 89% | 2776 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,608 psi | 56% | 1624 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 58,479 psi | 90% | 2651 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,276 psi | 88% | 2628 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,391 psi | 87% | 2621 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 56,521 psi | 87% | 2667 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,159 psi | 88% | 2657 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 56,028 psi | 86% | 2674 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,985 psi | 88% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,521 psi | 85% | 2661 fps | 97.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,100 psi | 85% | 2759 fps | 98.3% |
| Lovex S060 | <<locked>> | 82% | 58,668 psi | 90% | 2612 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 57,856 psi | 89% | 2625 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,276 psi | 88% | 2654 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 58,711 psi | 90% | 2697 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,630 psi | 73% | 2559 fps | 99.6% |
| Norma 203B | <<locked>> | 84% | 58,537 psi | 90% | 2680 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,653 psi | 89% | 2726 fps | 99.2% |
| Norma MRP | <<locked>> | 98% | 56,666 psi | 87% | 2805 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 57,653 psi | 89% | 2713 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,608 psi | 86% | 2657 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,709 psi | 86% | 2779 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 92% | 56,681 psi | 87% | 2723 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,792 psi | 77% | 2661 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,405 psi | 58% | 1663 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,289 psi | 87% | 2648 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,232 psi | 88% | 2743 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,230 psi | 85% | 2703 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,580 psi | 89% | 2785 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,730 psi | 70% | 2690 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 82% | 56,159 psi | 86% | 2589 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,507 psi | 87% | 2638 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,841 psi | 89% | 2700 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 96% | 54,998 psi | 85% | 2707 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 88% | 55,695 psi | 86% | 2638 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,276 psi | 88% | 2654 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,856 psi | 89% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 58,711 psi | 90% | 2697 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 58,160 psi | 89% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,043 psi | 88% | 2520 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,072 psi | 88% | 2615 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 58,392 psi | 90% | 2756 fps | 99.5% |
| Somchem S355 | <<locked>> | 86% | 56,478 psi | 87% | 2635 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,912 psi | 86% | 2644 fps | 97.6% |
| Somchem S365 | <<locked>> | 94% | 57,537 psi | 89% | 2717 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,550 psi | 85% | 2680 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 82% | 56,623 psi | 87% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,768 psi | 87% | 2559 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,479 psi | 88% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,391 psi | 87% | 2661 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,737 psi | 84% | 2657 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 84% | 58,363 psi | 90% | 2605 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,347 psi | 85% | 2667 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,492 psi | 87% | 2730 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,782 psi | 87% | 2799 fps | 98.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,472 psi | 75% | 2657 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,622 psi | 86% | 2628 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,885 psi | 89% | 2740 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,255 psi | 76% | 2772 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,724 psi | 86% | 2680 fps | 99.1% |
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% | 54,462 psi | 84% | 2520 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,648 psi | 79% | 2543 fps | 99% |
| Accurate 3100 | <<locked>> | 80% | 29,298 psi | 45% | 2192 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 51,663 psi | 79% | 2530 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,726 psi | 61% | 2431 fps | 99.5% |
| Accurate High Country | <<locked>> | 88% | 41,394 psi | 64% | 2552 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 94% | 48,225 psi | 74% | 2664 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 48,283 psi | 74% | 2510 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,159 psi | 59% | 2411 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 92% | 44,193 psi | 68% | 2559 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 98% | 34,896 psi | 54% | 2415 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,896 psi | 83% | 2720 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 38,406 psi | 59% | 2415 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,950 psi | 75% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,359 psi | 81% | 2598 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,261 psi | 59% | 2434 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,569 psi | 67% | 2546 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,043 psi | 59% | 2408 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,087 psi | 59% | 2454 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,355 psi | 44% | 2221 fps | 98.2% |
| Alliant Reloder-25 | <<locked>> | 86% | 30,066 psi | 46% | 2280 fps | 95.8% |
| Alliant Reloder-26 | 49.8 gr | 80% | 30,153 psi | 46% | 2326 fps | 96.8% |
| Bofors RP15 | <<locked>> | 90% | 37,782 psi | 58% | 2448 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 49,588 psi | 76% | 2546 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,856 psi | 61% | 2523 fps | 95.3% |
| Bofors RP5 | <<locked>> | 88% | 38,087 psi | 59% | 2454 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 43,337 psi | 67% | 2438 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 40,509 psi | 62% | 2484 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 49,792 psi | 77% | 2562 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,539 psi | 64% | 2474 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 44,411 psi | 68% | 2490 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 44,353 psi | 68% | 2513 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,383 psi | 71% | 2549 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,868 psi | 55% | 2333 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,230 psi | 83% | 2638 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,768 psi | 58% | 2516 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 40,321 psi | 62% | 2487 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 42% | 1450 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,824 psi | 84% | 2602 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,763 psi | 78% | 2539 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,910 psi | 81% | 2572 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 38,928 psi | 60% | 2372 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,715 psi | 69% | 2461 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 38,072 psi | 59% | 2385 fps | 99.3% |
| IMR 4895 | <<locked>> | 80% | 53,722 psi | 83% | 2621 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 43,366 psi | 67% | 2461 fps | 95% |
| IMR 7828 SSC | 53.5 gr | 92% | 42,163 psi | 65% | 2533 fps | 95.1% |
| Lovex S060 | <<locked>> | 80% | 55,317 psi | 85% | 2569 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 51,126 psi | 79% | 2536 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,409 psi | 65% | 2421 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 40,625 psi | 63% | 2405 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 30,516 psi | 47% | 2221 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 51,721 psi | 80% | 2585 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,493 psi | 59% | 2398 fps | 95.3% |
| Norma MRP | <<locked>> | 84% | 34,911 psi | 54% | 2411 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 39,363 psi | 61% | 2421 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 80% | 52,127 psi | 80% | 2608 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,018 psi | 65% | 2543 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 38,087 psi | 59% | 2411 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 92% | 37,304 psi | 57% | 2431 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,934 psi | 43% | 1483 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,530 psi | 76% | 2546 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,267 psi | 71% | 2592 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,421 psi | 61% | 2448 fps | 99.3% |
| ReloadSwiss RS 70 | 49.4 gr | 80% | 38,014 psi | 58% | 2457 fps | 98.9% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,650 psi | 53% | 2441 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 52,910 psi | 81% | 2543 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,746 psi | 72% | 2500 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,192 psi | 65% | 2444 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 84% | 37,057 psi | 57% | 2392 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 43,337 psi | 67% | 2438 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,409 psi | 65% | 2421 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 51,126 psi | 79% | 2536 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,625 psi | 63% | 2405 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,819 psi | 74% | 2549 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,500 psi | 73% | 2395 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,452 psi | 64% | 2369 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,724 psi | 56% | 2385 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 46,905 psi | 72% | 2497 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,963 psi | 71% | 2490 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 35,795 psi | 55% | 2382 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,273 psi | 54% | 2326 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 53,243 psi | 82% | 2503 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,519 psi | 82% | 2520 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,831 psi | 69% | 2431 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,770 psi | 63% | 2418 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 88% | 37,101 psi | 57% | 2359 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 51,648 psi | 79% | 2516 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,147 psi | 62% | 2421 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 31,473 psi | 48% | 2290 fps | 98.2% |
| Vihtavuori N560 | <<locked>> | 90% | 43,178 psi | 66% | 2569 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 96% | 42,264 psi | 65% | 2546 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,624 psi | 61% | 2388 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,539 psi | 64% | 2474 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,019 psi | 38% | 2208 fps | 97.6% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,581 psi | 61% | 2415 fps | 95.8% |
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 96 powders for .280 Ackley Improved loaded with the .284 | 175gr | Nosler AccuBond Long Range. Alliant Reloder-26 delivers the highest muzzle velocity at 2,844 fps; across all powders the maximum-charge window runs from 1,624 fps to 2,844 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 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 175.0 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 2225 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. IMR 7828 SSC, Alliant Reloder-26, ReloadSwiss RS 70 rank at the top here: for .280 Ackley Improved with the .284 | 175gr | Nosler AccuBond Long Range 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.