Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 164gr | Apex Outdoors Afterburner bullet and 37 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Winchester StaBALL HD.
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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Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 86% | 42,047 psi | 89% | 2592 fps | 99.5% |
| Accurate High Country | <<locked>> | 84% | 42,525 psi | 90% | 2710 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 82% | 40,872 psi | 87% | 2608 fps | 97.5% |
| ADI AR 2213 | <<locked>> | 86% | 41,597 psi | 88% | 2654 fps | 96.5% |
| ADI AR 2217 | <<locked>> | 96% | 42,554 psi | 90% | 2671 fps | 97% |
| ADI AR 2225 | <<locked>> | 98% | 40,640 psi | 86% | 2700 fps | 99.3% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 41,060 psi | 87% | 2605 fps | 97.6% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,712 psi | 86% | 2598 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,669 psi | 88% | 2664 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 40,045 psi | 85% | 2612 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 42,047 psi | 89% | 2703 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 41,539 psi | 88% | 2720 fps | 100% |
| Bofors RP15 | <<locked>> | 88% | 41,350 psi | 88% | 2654 fps | 97.7% |
| Bofors RP30 | <<locked>> | 94% | 41,350 psi | 88% | 2690 fps | 97.2% |
| Bofors RP5 | <<locked>> | 86% | 41,669 psi | 88% | 2664 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 92% | 40,901 psi | 87% | 2638 fps | 97.2% |
| Hodgdon Retumbo | <<locked>> | 92% | 41,278 psi | 88% | 2749 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 79% | 1739 fps | 100% |
| IMR 7828 SSC | <<locked>> | 88% | 42,641 psi | 90% | 2687 fps | 96.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,088 psi | 83% | 2664 fps | 96.3% |
| Lovex S071 | <<locked>> | 90% | 40,814 psi | 87% | 2569 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 39,073 psi | 83% | 2690 fps | 98.5% |
| Norma MRP | <<locked>> | 84% | 40,988 psi | 87% | 2677 fps | 98.9% |
| Ramshot Grand | <<locked>> | 88% | 42,438 psi | 90% | 2700 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 90% | 40,712 psi | 86% | 2641 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,101 psi | 81% | 1785 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 40,640 psi | 86% | 2733 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 82% | 42,192 psi | 90% | 2582 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 82% | 40,103 psi | 85% | 2589 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 42,482 psi | 90% | 2638 fps | 98.1% |
| Somchem S385 | <<locked>> | 82% | 40,828 psi | 87% | 2572 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 86% | 40,248 psi | 85% | 2552 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 84% | 42,235 psi | 90% | 2638 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 41,118 psi | 87% | 2667 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 90% | 41,104 psi | 87% | 2657 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 41,713 psi | 88% | 2772 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,784 psi | 84% | 2552 fps | 97.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 34,664 psi | 74% | 2438 fps | 98.2% |
| Accurate High Country | <<locked>> | 80% | 37,014 psi | 79% | 2589 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 38,261 psi | 81% | 2549 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 38,957 psi | 83% | 2595 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 92% | 37,507 psi | 80% | 2559 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 88% | 29,907 psi | 63% | 2415 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,653 psi | 82% | 2552 fps | 96.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,348 psi | 81% | 2549 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,171 psi | 72% | 2493 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,083 psi | 70% | 2464 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,906 psi | 61% | 2379 fps | 96.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,853 psi | 76% | 2598 fps | 99.6% |
| Bofors RP15 | <<locked>> | 82% | 34,084 psi | 72% | 2490 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 36,448 psi | 77% | 2582 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 34,171 psi | 72% | 2493 fps | 95.6% |
| Hodgdon H1000 | <<locked>> | 88% | 35,868 psi | 76% | 2523 fps | 95.3% |
| Hodgdon Retumbo | 55.3 gr | 86% | 34,040 psi | 72% | 2566 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 59% | 1555 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 37,594 psi | 80% | 2575 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 98% | 36,651 psi | 78% | 2605 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 30,008 psi | 64% | 2323 fps | 96.7% |
| Norma 217 | <<locked>> | 92% | 30,298 psi | 64% | 2461 fps | 95% |
| Norma MRP | <<locked>> | 80% | 35,694 psi | 76% | 2559 fps | 97.6% |
| Ramshot Grand | <<locked>> | 84% | 37,086 psi | 79% | 2579 fps | 95.4% |
| Ramshot Magnum | <<locked>> | 84% | 33,141 psi | 70% | 2467 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,601 psi | 61% | 1594 fps | 100% |
| ReloadSwiss RS 76 | 57.8 gr | 84% | 31,024 psi | 66% | 2480 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 39,552 psi | 84% | 2526 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 37,710 psi | 80% | 2536 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,376 psi | 79% | 2530 fps | 96.7% |
| Somchem S385 | <<locked>> | 80% | 38,261 psi | 81% | 2516 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 80% | 33,243 psi | 71% | 2398 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 37,159 psi | 79% | 2536 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 38,348 psi | 81% | 2605 fps | 95% |
| Vihtavuori N565 | <<locked>> | 88% | 38,479 psi | 82% | 2598 fps | 95.4% |
| Winchester StaBALL HD | 52.8 gr | 80% | 29,370 psi | 62% | 2487 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,809 psi | 74% | 2441 fps | 95.6% |
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 37 powders for .280 Riml. N.E. Ross loaded with the .284 | 164gr | Apex Outdoors Afterburner. Winchester StaBALL HD delivers the highest muzzle velocity at 2,772 fps; across all powders the maximum-charge window runs from 1,739 fps to 2,772 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 37 of the 37 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 79–90 %, leaving at least 10 % headroom. The 164.0 gr projectile in 0.284" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, IMR 8133 Enduron, Norma 217 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. Hodgdon Retumbo, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .280 Riml. N.E. Ross with the .284 | 164gr | Apex Outdoors Afterburner 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.