Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 138gr | TWENTY-NINE ERTP bullet and 30 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>> | 88% | 40,161 psi | 85% | 2782 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 86% | 42,337 psi | 90% | 2864 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,204 psi | 83% | 2874 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 42,598 psi | 90% | 2867 fps | 96.4% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 42,598 psi | 90% | 2867 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 82% | 42,366 psi | 90% | 2890 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,148 psi | 89% | 2858 fps | 96.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 40,799 psi | 87% | 2867 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 40,408 psi | 86% | 2897 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 88% | 42,525 psi | 90% | 2976 fps | 99.7% |
| Bofors RP15 | <<locked>> | 92% | 42,192 psi | 90% | 2904 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 40,030 psi | 85% | 2772 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 42,221 psi | 90% | 2995 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,695 psi | 78% | 1916 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 42,148 psi | 89% | 2828 fps | 99.6% |
| Lovex S071 | <<locked>> | 94% | 41,350 psi | 88% | 2808 fps | 98.5% |
| Norma MRP | <<locked>> | 88% | 42,061 psi | 89% | 2933 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 82% | 42,337 psi | 90% | 2864 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 94% | 42,380 psi | 90% | 2894 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,550 psi | 80% | 1965 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 42,612 psi | 90% | 2923 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 41,916 psi | 89% | 2982 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 86% | 41,437 psi | 88% | 2841 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,060 psi | 87% | 2838 fps | 96.2% |
| Somchem S365 | <<locked>> | 82% | 40,176 psi | 85% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 42,119 psi | 89% | 2825 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 90% | 41,568 psi | 88% | 2805 fps | 96.8% |
| Vihtavuori N555 | <<locked>> | 86% | 40,190 psi | 85% | 2838 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 94% | 42,322 psi | 90% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,408 psi | 88% | 2805 fps | 96.1% |
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% | 30,516 psi | 65% | 2546 fps | 95% |
| ADI AR 2209 | <<locked>> | 84% | 39,740 psi | 84% | 2805 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 96% | 34,418 psi | 73% | 2743 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 39,972 psi | 85% | 2808 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 39,972 psi | 85% | 2808 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,755 psi | 84% | 2831 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,566 psi | 84% | 2802 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,356 psi | 62% | 2579 fps | 98.2% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,299 psi | 66% | 2651 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,647 psi | 67% | 2703 fps | 97% |
| Bofors RP15 | <<locked>> | 90% | 39,610 psi | 84% | 2841 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,507 psi | 80% | 2717 fps | 99.8% |
| Hodgdon Retumbo | 63.2 gr | 92% | 37,144 psi | 79% | 2858 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,456 psi | 58% | 1713 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 39,537 psi | 84% | 2772 fps | 99.3% |
| Lovex S071 | <<locked>> | 86% | 31,908 psi | 68% | 2582 fps | 95.6% |
| Norma MRP | <<locked>> | 82% | 34,084 psi | 72% | 2736 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 39,595 psi | 84% | 2802 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 36,637 psi | 78% | 2759 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,094 psi | 60% | 1759 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,624 psi | 84% | 2854 fps | 99% |
| ReloadSwiss RS 76 | 67.6 gr | 92% | 36,448 psi | 77% | 2838 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 84% | 38,653 psi | 82% | 2779 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 38,305 psi | 81% | 2772 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 37,376 psi | 79% | 2769 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 36,840 psi | 78% | 2707 fps | 95.7% |
| Vihtavuori N165 | <<locked>> | 86% | 36,245 psi | 77% | 2684 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 32,866 psi | 70% | 2661 fps | 98.2% |
| Winchester StaBALL HD | 56.4 gr | 80% | 26,034 psi | 55% | 2566 fps | 97.7% |
| Winchester Supreme 780 | <<locked>> | 86% | 38,624 psi | 82% | 2746 fps | 95.2% |
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 30 powders for .280 Riml. N.E. Ross loaded with the .284 | 138gr | TWENTY-NINE ERTP. Winchester StaBALL HD delivers the highest muzzle velocity at 3,038 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,038 fps. ADI AR 2225 gives the best case fill at 100 %, and 30 of the 30 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 138.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Hodgdon TrailBoss, ReloadSwiss RS 14 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 | 138gr | TWENTY-NINE ERTP 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.