Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 140gr | Swift A-Frame bullet and 26 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 40,509 psi | 86% | 2779 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 84% | 42,264 psi | 90% | 2858 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,163 psi | 89% | 2946 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 84% | 42,177 psi | 89% | 2851 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 40,437 psi | 86% | 2854 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 88% | 41,263 psi | 88% | 2861 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 40,785 psi | 87% | 2897 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 84% | 40,045 psi | 85% | 2907 fps | 99.6% |
| Bofors RP15 | <<locked>> | 88% | 39,885 psi | 85% | 2838 fps | 96.1% |
| Bofors RP5 | <<locked>> | 86% | 40,437 psi | 86% | 2854 fps | 96.4% |
| Hodgdon H1000 | <<locked>> | 94% | 42,583 psi | 90% | 2890 fps | 96.5% |
| Hodgdon Retumbo | <<locked>> | 92% | 40,045 psi | 85% | 2936 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 78% | 1929 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 41,872 psi | 89% | 2808 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 37,826 psi | 80% | 2864 fps | 97% |
| Norma MRP | <<locked>> | 86% | 42,511 psi | 90% | 2933 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 90% | 39,494 psi | 84% | 2825 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 80% | 1975 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 42,482 psi | 90% | 2989 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 84% | 41,553 psi | 88% | 2838 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 41,191 psi | 87% | 2831 fps | 96.7% |
| Somchem S385 | <<locked>> | 84% | 42,134 psi | 89% | 2818 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 88% | 41,626 psi | 88% | 2795 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 84% | 40,625 psi | 86% | 2831 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 90% | 40,422 psi | 86% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,437 psi | 88% | 2799 fps | 96.6% |
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% | 33,011 psi | 70% | 2602 fps | 96.5% |
| ADI AR 2209 | <<locked>> | 80% | 37,101 psi | 79% | 2736 fps | 95% |
| ADI AR 2225 | <<locked>> | 92% | 32,692 psi | 69% | 2690 fps | 95.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,086 psi | 79% | 2730 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,681 psi | 80% | 2789 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,589 psi | 67% | 2631 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,530 psi | 63% | 2589 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,432 psi | 73% | 2769 fps | 98.4% |
| Bofors RP15 | <<locked>> | 86% | 37,376 psi | 79% | 2779 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 37,681 psi | 80% | 2789 fps | 95.5% |
| Hodgdon H1000 | <<locked>> | 92% | 39,711 psi | 84% | 2822 fps | 95.4% |
| Hodgdon Retumbo | 65 gr | 90% | 37,391 psi | 79% | 2864 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 59% | 1726 fps | 100% |
| Lovex S071 | <<locked>> | 82% | 30,298 psi | 64% | 2526 fps | 95.4% |
| Norma 217 | <<locked>> | 98% | 35,288 psi | 75% | 2799 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 34,374 psi | 73% | 2733 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 86% | 34,243 psi | 73% | 2694 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,181 psi | 60% | 1765 fps | 100% |
| ReloadSwiss RS 76 | 68 gr | 88% | 34,229 psi | 73% | 2769 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 36,216 psi | 77% | 2710 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,551 psi | 82% | 2772 fps | 95.8% |
| Somchem S385 | <<locked>> | 80% | 36,898 psi | 78% | 2697 fps | 96.2% |
| Vihtavuori N165 | <<locked>> | 84% | 36,376 psi | 77% | 2680 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 35,563 psi | 75% | 2717 fps | 99.1% |
| Winchester StaBALL HD | 59.4 gr | 80% | 28,152 psi | 60% | 2641 fps | 99.2% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,609 psi | 82% | 2736 fps | 95.7% |
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 26 powders for .280 Riml. N.E. Ross loaded with the .284 | 140gr | Swift A-Frame. ReloadSwiss RS 76 delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,929 fps to 2,989 fps. ADI AR 2225 gives the best case fill at 100 %, and 26 of the 26 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 78–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Hodgdon TrailBoss, 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .280 Riml. N.E. Ross with the .284 | 140gr | 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.