Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 145gr | Fox Classic Hunter bullet and 26 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>> | 88% | 40,596 psi | 86% | 2736 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 84% | 40,176 psi | 85% | 2762 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,813 psi | 84% | 2844 fps | 98.3% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,030 psi | 85% | 2756 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,640 psi | 86% | 2812 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 41,582 psi | 88% | 2822 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 41,104 psi | 87% | 2858 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 86% | 40,219 psi | 85% | 2867 fps | 99.7% |
| Bofors RP15 | <<locked>> | 90% | 40,277 psi | 85% | 2805 fps | 96.4% |
| Bofors RP5 | <<locked>> | 88% | 40,640 psi | 86% | 2812 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 40,495 psi | 86% | 2723 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,176 psi | 85% | 2894 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,622 psi | 78% | 1873 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 41,843 psi | 89% | 2762 fps | 99% |
| Norma MRP | <<locked>> | 86% | 39,958 psi | 85% | 2831 fps | 97.8% |
| Ramshot Magnum | <<locked>> | 92% | 39,958 psi | 85% | 2789 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,463 psi | 79% | 1919 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 39,842 psi | 85% | 2881 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 86% | 42,119 psi | 89% | 2802 fps | 97.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,742 psi | 89% | 2799 fps | 97% |
| Somchem S365 | <<locked>> | 82% | 40,857 psi | 87% | 2779 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 42,496 psi | 90% | 2779 fps | 97.9% |
| Vihtavuori N165 | <<locked>> | 90% | 42,032 psi | 89% | 2759 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 86% | 40,785 psi | 87% | 2792 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 92% | 40,393 psi | 86% | 2930 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,916 psi | 89% | 2766 fps | 96.8% |
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% | 30,589 psi | 65% | 2500 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 82% | 37,666 psi | 80% | 2703 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 94% | 32,576 psi | 69% | 2644 fps | 95.2% |
| Alliant Reloder-19 | <<locked>> | 82% | 37,565 psi | 80% | 2700 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 37,884 psi | 80% | 2749 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,588 psi | 63% | 2536 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 29,515 psi | 63% | 2549 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,010 psi | 68% | 2664 fps | 97.7% |
| Bofors RP15 | <<locked>> | 88% | 37,565 psi | 80% | 2743 fps | 95.4% |
| Bofors RP5 | <<locked>> | 86% | 37,884 psi | 80% | 2749 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,855 psi | 80% | 2671 fps | 99.9% |
| Hodgdon Retumbo | 61.9 gr | 90% | 35,215 psi | 75% | 2756 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,354 psi | 58% | 1673 fps | 100% |
| Lovex S071 | <<locked>> | 84% | 29,965 psi | 64% | 2480 fps | 95.4% |
| Norma MRP | <<locked>> | 82% | 34,505 psi | 73% | 2697 fps | 96% |
| Ramshot Magnum | <<locked>> | 88% | 34,418 psi | 73% | 2654 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 59% | 1716 fps | 100% |
| ReloadSwiss RS 76 | 66.2 gr | 90% | 34,360 psi | 73% | 2733 fps | 96% |
| Rottweil R 905 | <<locked>> | 82% | 36,564 psi | 78% | 2677 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 36,230 psi | 77% | 2674 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 37,971 psi | 81% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,751 psi | 74% | 2605 fps | 95.5% |
| Vihtavuori N165 | <<locked>> | 86% | 36,782 psi | 78% | 2644 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 80% | 33,040 psi | 70% | 2612 fps | 98.7% |
| Winchester StaBALL HD | 56.5 gr | 80% | 26,121 psi | 55% | 2526 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 84% | 36,535 psi | 78% | 2644 fps | 95.1% |
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 | 145gr | Fox Classic Hunter. Winchester StaBALL HD delivers the highest muzzle velocity at 2,930 fps; across all powders the maximum-charge window runs from 1,873 fps to 2,930 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 145.0 gr projectile in 0.284" calls for a 1:10.0 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. Hodgdon Retumbo, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .280 Riml. N.E. Ross with the .284 | 145gr | Fox Classic Hunter 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.