Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 160gr | North Fork FPS bullet and 34 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 ADI AR 2225.
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>> | 84% | 40,959 psi | 87% | 2621 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 82% | 42,467 psi | 90% | 2697 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 84% | 40,698 psi | 86% | 2690 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 94% | 41,930 psi | 89% | 2717 fps | 97.2% |
| ADI AR 2225 | <<locked>> | 96% | 40,074 psi | 85% | 2740 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 82% | 42,467 psi | 90% | 2690 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 84% | 40,944 psi | 87% | 2700 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 86% | 42,061 psi | 89% | 2697 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 41,539 psi | 88% | 2746 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 40,770 psi | 86% | 2746 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 40,611 psi | 86% | 2690 fps | 97.7% |
| Bofors RP30 | <<locked>> | 92% | 40,988 psi | 87% | 2733 fps | 97.3% |
| Bofors RP5 | <<locked>> | 84% | 40,944 psi | 87% | 2700 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 90% | 40,059 psi | 85% | 2677 fps | 97.2% |
| Hodgdon Retumbo | <<locked>> | 90% | 40,466 psi | 86% | 2785 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,159 psi | 79% | 1798 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,134 psi | 89% | 2631 fps | 96.4% |
| IMR 7828 SSC | <<locked>> | 86% | 41,901 psi | 89% | 2730 fps | 96.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,205 psi | 87% | 2762 fps | 97.2% |
| Lovex S071 | <<locked>> | 90% | 42,540 psi | 90% | 2651 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 41,466 psi | 88% | 2789 fps | 99.1% |
| Norma MRP | <<locked>> | 82% | 40,118 psi | 85% | 2710 fps | 98.8% |
| Ramshot Grand | <<locked>> | 86% | 41,698 psi | 88% | 2740 fps | 97.3% |
| Ramshot Magnum | <<locked>> | 88% | 40,074 psi | 85% | 2677 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,116 psi | 81% | 1844 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 40,045 psi | 85% | 2772 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 82% | 41,930 psi | 89% | 2677 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 41,582 psi | 88% | 2674 fps | 98% |
| Somchem S385 | <<locked>> | 82% | 42,351 psi | 90% | 2654 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 86% | 42,018 psi | 89% | 2641 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 82% | 41,220 psi | 87% | 2667 fps | 100% |
| Vihtavuori N565 | <<locked>> | 88% | 40,509 psi | 86% | 2694 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 41,771 psi | 89% | 2808 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 41,771 psi | 89% | 2644 fps | 97.9% |
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% | 35,752 psi | 76% | 2510 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 39,697 psi | 84% | 2638 fps | 97.4% |
| ADI AR 2213 | <<locked>> | 82% | 37,884 psi | 80% | 2625 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 90% | 36,666 psi | 78% | 2595 fps | 95.3% |
| ADI AR 2225 | 60.1 gr | 86% | 29,037 psi | 62% | 2438 fps | 95% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,740 psi | 84% | 2631 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,563 psi | 75% | 2575 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,330 psi | 73% | 2539 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,805 psi | 63% | 2454 fps | 97.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,753 psi | 80% | 2684 fps | 99.8% |
| Bofors RP15 | <<locked>> | 80% | 33,156 psi | 70% | 2513 fps | 95.1% |
| Bofors RP30 | <<locked>> | 88% | 35,752 psi | 76% | 2612 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 35,563 psi | 75% | 2575 fps | 96.2% |
| Hodgdon H1000 | <<locked>> | 86% | 35,027 psi | 74% | 2556 fps | 95.3% |
| Hodgdon Retumbo | 58.7 gr | 84% | 33,185 psi | 70% | 2595 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,818 psi | 59% | 1608 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,508 psi | 84% | 2575 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 82% | 36,622 psi | 78% | 2608 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 96% | 36,158 psi | 77% | 2641 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 30,864 psi | 65% | 2392 fps | 97.1% |
| Norma 217 | <<locked>> | 92% | 31,720 psi | 67% | 2549 fps | 96% |
| Norma MRP | <<locked>> | 80% | 37,420 psi | 79% | 2648 fps | 98.2% |
| Ramshot Grand | <<locked>> | 82% | 36,143 psi | 77% | 2612 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 82% | 32,256 psi | 68% | 2493 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,543 psi | 61% | 1647 fps | 100% |
| ReloadSwiss RS 76 | 61.4 gr | 82% | 30,197 psi | 64% | 2503 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 39,175 psi | 83% | 2621 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,856 psi | 82% | 2615 fps | 97.3% |
| Somchem S385 | <<locked>> | 80% | 39,668 psi | 84% | 2602 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 80% | 34,403 psi | 73% | 2477 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 80% | 38,493 psi | 82% | 2615 fps | 100% |
| Vihtavuori N565 | <<locked>> | 86% | 37,710 psi | 80% | 2631 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,661 psi | 65% | 2572 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,289 psi | 77% | 2526 fps | 96.4% |
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 44 powders for .280 Riml. N.E. Ross loaded with the .284 | 160gr | North Fork FPS. Winchester StaBALL HD delivers the highest muzzle velocity at 2,808 fps; across all powders the maximum-charge window runs from 1,798 fps to 2,808 fps. Alliant Reloder-50 gives the best case fill at 100 %, and 44 of the 44 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 160.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-50, Hodgdon TrailBoss, IMR 8133 Enduron 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, ADI AR 2225 rank at the top here: for .280 Riml. N.E. Ross with the .284 | 160gr | North Fork FPS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, Alliant Reloder-50, Baschieri & Pellagri 109 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.