Load Specifications
Load data in caliber .280 Ackley Improved with .284 | 180gr | Lapua ScenarL 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% | 58,291 psi | 90% | 2523 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,303 psi | 85% | 2556 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,769 psi | 89% | 2661 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 58,711 psi | 90% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,144 psi | 86% | 2648 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,115 psi | 86% | 2753 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 86% | 58,131 psi | 89% | 2608 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,797 psi | 87% | 2694 fps | 99.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 58,073 psi | 89% | 2749 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,449 psi | 58% | 2444 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 58,436 psi | 90% | 2733 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,985 psi | 86% | 2589 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,999 psi | 86% | 2608 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,594 psi | 87% | 2694 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 58,233 psi | 90% | 2717 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,144 psi | 86% | 2684 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,290 psi | 88% | 2743 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,215 psi | 83% | 2667 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,152 psi | 73% | 2618 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 58,494 psi | 90% | 2808 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,634 psi | 81% | 2677 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 56,884 psi | 88% | 2605 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,004 psi | 66% | 2549 fps | 96.6% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,290 psi | 88% | 2743 fps | 99.5% |
| Bofors RP7 | <<locked>> | 88% | 55,912 psi | 86% | 2598 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,470 psi | 71% | 2562 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 84% | 57,029 psi | 88% | 2625 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 58,015 psi | 89% | 2697 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 57,653 psi | 89% | 2661 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 98% | 58,218 psi | 90% | 2694 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,913 psi | 88% | 2674 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,087 psi | 88% | 2621 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 58,450 psi | 90% | 2648 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,122 psi | 71% | 2661 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 90% | 58,682 psi | 90% | 2740 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 56% | 1594 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,696 psi | 89% | 2592 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,826 psi | 87% | 2585 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 56,884 psi | 88% | 2631 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,363 psi | 88% | 2621 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 56,449 psi | 87% | 2638 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,435 psi | 88% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,999 psi | 86% | 2628 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,419 psi | 85% | 2723 fps | 98.5% |
| Lovex S062 | <<locked>> | 84% | 57,986 psi | 89% | 2582 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,870 psi | 89% | 2618 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,651 psi | 86% | 2615 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,124 psi | 74% | 2526 fps | 99.7% |
| Norma 203B | <<locked>> | 84% | 58,740 psi | 90% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,841 psi | 89% | 2687 fps | 99.3% |
| Norma MRP | <<locked>> | 98% | 57,116 psi | 88% | 2769 fps | 100% |
| Norma URP | <<locked>> | 92% | 58,059 psi | 89% | 2677 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,246 psi | 87% | 2621 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,188 psi | 86% | 2746 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 92% | 56,884 psi | 88% | 2684 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,980 psi | 77% | 2625 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,449 psi | 58% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,840 psi | 87% | 2612 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,725 psi | 89% | 2703 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,782 psi | 86% | 2667 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,928 psi | 89% | 2746 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,948 psi | 71% | 2654 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 56,463 psi | 87% | 2549 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,087 psi | 88% | 2602 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 58,320 psi | 90% | 2664 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 96% | 55,535 psi | 85% | 2674 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 55,912 psi | 86% | 2598 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,870 psi | 89% | 2618 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,986 psi | 89% | 2582 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,651 psi | 86% | 2615 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 58,494 psi | 90% | 2657 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,435 psi | 88% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,377 psi | 88% | 2575 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 58,711 psi | 90% | 2720 fps | 99.6% |
| Somchem S355 | <<locked>> | 86% | 56,652 psi | 87% | 2592 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,565 psi | 87% | 2615 fps | 97.9% |
| Somchem S365 | <<locked>> | 94% | 58,044 psi | 89% | 2677 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,072 psi | 86% | 2648 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 57,246 psi | 88% | 2507 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,159 psi | 88% | 2523 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 58,044 psi | 89% | 2569 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,739 psi | 87% | 2625 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,390 psi | 85% | 2628 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 55,201 psi | 85% | 2523 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,753 psi | 86% | 2631 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,768 psi | 87% | 2690 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,276 psi | 88% | 2766 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,878 psi | 75% | 2625 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,130 psi | 86% | 2592 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 58,305 psi | 90% | 2703 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,835 psi | 77% | 2736 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,072 psi | 86% | 2644 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% | 54,766 psi | 84% | 2480 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,808 psi | 80% | 2503 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 29,573 psi | 45% | 2165 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 51,967 psi | 80% | 2493 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,059 psi | 62% | 2398 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 92% | 45,324 psi | 70% | 2575 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 48,530 psi | 75% | 2474 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 38,493 psi | 59% | 2382 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 41,655 psi | 64% | 2474 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 33,040 psi | 51% | 2333 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 54,172 psi | 83% | 2680 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,298 psi | 76% | 2497 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,707 psi | 81% | 2562 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,740 psi | 60% | 2405 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,034 psi | 68% | 2513 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,189 psi | 59% | 2375 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,027 psi | 55% | 2372 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,572 psi | 44% | 2195 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,442 psi | 44% | 2201 fps | 95.2% |
| Alliant Reloder-26 | 49.1 gr | 80% | 30,487 psi | 47% | 2300 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 38,058 psi | 59% | 2415 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 49,995 psi | 77% | 2510 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 40,118 psi | 62% | 2493 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 36,027 psi | 55% | 2372 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 43,627 psi | 67% | 2402 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 40,698 psi | 63% | 2451 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 50,198 psi | 77% | 2526 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 41,887 psi | 64% | 2441 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 44,759 psi | 69% | 2457 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 90% | 44,686 psi | 69% | 2484 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 43,671 psi | 67% | 2464 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,361 psi | 56% | 2306 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 54,694 psi | 84% | 2602 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 35,679 psi | 55% | 2428 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 40,582 psi | 62% | 2454 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 42% | 1424 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,053 psi | 79% | 2500 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,229 psi | 82% | 2536 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 39,204 psi | 60% | 2339 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,962 psi | 69% | 2428 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 38,421 psi | 59% | 2352 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 54,085 psi | 83% | 2585 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 43,830 psi | 67% | 2431 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 92% | 42,511 psi | 65% | 2503 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 51,387 psi | 79% | 2497 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,656 psi | 66% | 2385 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 40,915 psi | 63% | 2372 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 28,877 psi | 44% | 2149 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,069 psi | 80% | 2549 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,827 psi | 60% | 2369 fps | 95.6% |
| Norma MRP | 48.8 gr | 82% | 32,837 psi | 51% | 2323 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 39,682 psi | 61% | 2392 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 52,359 psi | 81% | 2572 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 42,192 psi | 65% | 2510 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 38,479 psi | 59% | 2382 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 35,012 psi | 54% | 2343 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 43% | 1460 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,937 psi | 77% | 2510 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,731 psi | 72% | 2556 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,610 psi | 61% | 2411 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,203 psi | 59% | 2421 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,838 psi | 54% | 2411 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,156 psi | 82% | 2503 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,050 psi | 72% | 2464 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 42,612 psi | 66% | 2415 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 37,463 psi | 58% | 2362 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 43,627 psi | 67% | 2402 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,656 psi | 66% | 2385 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 51,387 psi | 79% | 2497 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,915 psi | 63% | 2372 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,211 psi | 74% | 2516 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,964 psi | 74% | 2362 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,727 psi | 64% | 2336 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,115 psi | 57% | 2359 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 47,224 psi | 73% | 2461 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 43,395 psi | 67% | 2408 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,114 psi | 56% | 2352 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,446 psi | 51% | 2251 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 53,795 psi | 83% | 2467 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,824 psi | 83% | 2484 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,121 psi | 69% | 2395 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,089 psi | 63% | 2385 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,099 psi | 54% | 2280 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 52,011 psi | 80% | 2480 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,480 psi | 62% | 2392 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 31,763 psi | 49% | 2260 fps | 98.5% |
| Vihtavuori N560 | 53.6 gr | 90% | 43,598 psi | 67% | 2539 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 42,801 psi | 66% | 2520 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,827 psi | 61% | 2356 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,887 psi | 64% | 2441 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,266 psi | 39% | 2188 fps | 98.1% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,202 psi | 57% | 2333 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 | 180gr | Lapua ScenarL. Alliant Reloder-26 delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,594 fps to 2,808 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 56–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.284" calls for a 1:9.5 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .280 Ackley Improved with the .284 | 180gr | Lapua ScenarL 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.