Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 140gr | Frontier BTSP bullet and 27 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% | 40,611 psi | 86% | 2776 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,479 psi | 84% | 2867 fps | 97.8% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 40,379 psi | 86% | 2802 fps | 95.9% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,583 psi | 90% | 2851 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,379 psi | 86% | 2844 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 41,307 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 40,872 psi | 87% | 2890 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 86% | 39,958 psi | 85% | 2904 fps | 99.5% |
| Bofors RP15 | <<locked>> | 92% | 42,656 psi | 90% | 2894 fps | 96.7% |
| Bofors RP5 | <<locked>> | 88% | 40,379 psi | 86% | 2844 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 40,451 psi | 86% | 2762 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 39,972 psi | 85% | 2923 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,825 psi | 78% | 1906 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 42,554 psi | 90% | 2818 fps | 99.7% |
| Lovex S071 | <<locked>> | 94% | 41,858 psi | 89% | 2802 fps | 98.7% |
| Norma MRP | <<locked>> | 88% | 42,598 psi | 90% | 2930 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 92% | 39,784 psi | 84% | 2822 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 80% | 1949 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 42,438 psi | 90% | 2976 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 86% | 41,872 psi | 89% | 2835 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,524 psi | 88% | 2831 fps | 96.5% |
| Somchem S365 | <<locked>> | 82% | 40,596 psi | 86% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 42,569 psi | 90% | 2818 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 90% | 41,800 psi | 89% | 2792 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 86% | 40,654 psi | 86% | 2828 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 39,784 psi | 84% | 2969 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,887 psi | 89% | 2802 fps | 96.4% |
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% | 30,864 psi | 65% | 2539 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 96% | 34,780 psi | 74% | 2740 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 37,724 psi | 80% | 2736 fps | 95% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,972 psi | 85% | 2792 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 37,913 psi | 80% | 2789 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,675 psi | 63% | 2572 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 29,602 psi | 63% | 2582 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,039 psi | 68% | 2700 fps | 97.4% |
| Bofors RP15 | <<locked>> | 90% | 40,045 psi | 85% | 2838 fps | 95.9% |
| Bofors RP5 | <<locked>> | 86% | 37,913 psi | 80% | 2789 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,884 psi | 80% | 2710 fps | 99.9% |
| Hodgdon Retumbo | 63 gr | 92% | 37,391 psi | 79% | 2851 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,557 psi | 58% | 1703 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 39,943 psi | 85% | 2762 fps | 99.4% |
| Lovex S071 | <<locked>> | 84% | 30,240 psi | 64% | 2523 fps | 95% |
| Norma MRP | <<locked>> | 82% | 34,447 psi | 73% | 2730 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 90% | 36,869 psi | 78% | 2753 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,007 psi | 59% | 1742 fps | 100% |
| ReloadSwiss RS 76 | 66 gr | 90% | 34,345 psi | 73% | 2762 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 84% | 39,073 psi | 83% | 2772 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 38,725 psi | 82% | 2769 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 37,768 psi | 80% | 2759 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,780 psi | 74% | 2638 fps | 95.1% |
| Vihtavuori N165 | <<locked>> | 86% | 36,651 psi | 78% | 2677 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 80% | 33,257 psi | 71% | 2654 fps | 98.5% |
| Winchester StaBALL HD | 56.3 gr | 80% | 26,339 psi | 56% | 2566 fps | 98.1% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,073 psi | 83% | 2740 fps | 95.5% |
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 27 powders for .280 Riml. N.E. Ross loaded with the .284 | 140gr | Frontier BTSP. ReloadSwiss RS 76 delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,906 fps to 2,976 fps. ADI AR 2225 gives the best case fill at 100 %, and 27 of the 27 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 1:9.0 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 | 140gr | Frontier BTSP 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.