Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 174gr | Prvi Partizan PSP BT bullet and 28 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>> | 82% | 40,567 psi | 86% | 2513 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 82% | 41,829 psi | 89% | 2635 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 82% | 40,030 psi | 85% | 2575 fps | 97.2% |
| ADI AR 2217 | <<locked>> | 92% | 41,452 psi | 88% | 2612 fps | 98% |
| ADI AR 2225 | <<locked>> | 96% | 42,656 psi | 90% | 2694 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 40,437 psi | 86% | 2585 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 84% | 41,785 psi | 89% | 2579 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 41,234 psi | 87% | 2631 fps | 100% |
| Bofors RP15 | <<locked>> | 84% | 40,321 psi | 86% | 2579 fps | 98.3% |
| Bofors RP30 | <<locked>> | 90% | 40,901 psi | 87% | 2625 fps | 98.1% |
| Bofors RP5 | <<locked>> | 82% | 40,437 psi | 86% | 2585 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 90% | 42,380 psi | 90% | 2631 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,916 psi | 89% | 2562 fps | 97.1% |
| Hodgdon Retumbo | <<locked>> | 88% | 40,393 psi | 86% | 2684 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 79% | 1726 fps | 100% |
| IMR 7828 SSC | <<locked>> | 84% | 41,336 psi | 88% | 2618 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 98% | 41,278 psi | 88% | 2661 fps | 98.1% |
| Lovex S071 | <<locked>> | 88% | 42,366 psi | 90% | 2546 fps | 99.9% |
| Norma 217 | <<locked>> | 98% | 41,684 psi | 88% | 2690 fps | 99.6% |
| Ramshot Grand | <<locked>> | 84% | 41,263 psi | 88% | 2628 fps | 98% |
| Ramshot Magnum | <<locked>> | 86% | 39,624 psi | 84% | 2569 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,232 psi | 81% | 1765 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 42,612 psi | 90% | 2730 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,539 psi | 88% | 2680 fps | 96.9% |
| Vihtavuori N165 | <<locked>> | 84% | 41,582 psi | 88% | 2533 fps | 99% |
| Vihtavuori N565 | <<locked>> | 86% | 40,306 psi | 86% | 2589 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 42,047 psi | 89% | 2694 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 82% | 41,089 psi | 87% | 2530 fps | 98.5% |
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% | 37,869 psi | 80% | 2457 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 80% | 38,899 psi | 83% | 2569 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 80% | 37,362 psi | 79% | 2516 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 33,968 psi | 72% | 2438 fps | 95.3% |
| ADI AR 2225 | 56.5 gr | 82% | 27,079 psi | 57% | 2293 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,782 psi | 80% | 2530 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,680 psi | 78% | 2484 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,589 psi | 67% | 2411 fps | 98.9% |
| Bofors RP15 | <<locked>> | 80% | 35,360 psi | 75% | 2470 fps | 97% |
| Bofors RP30 | <<locked>> | 84% | 33,344 psi | 71% | 2457 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 37,782 psi | 80% | 2530 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 82% | 32,430 psi | 69% | 2398 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,160 psi | 83% | 2507 fps | 96.3% |
| Hodgdon Retumbo | 55.1 gr | 80% | 30,850 psi | 65% | 2438 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,108 psi | 60% | 1542 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 36,172 psi | 77% | 2500 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 33,910 psi | 72% | 2490 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 32,822 psi | 70% | 2346 fps | 98.5% |
| Norma 217 | <<locked>> | 86% | 27,949 psi | 59% | 2349 fps | 95.1% |
| Ramshot Grand | <<locked>> | 80% | 35,853 psi | 76% | 2507 fps | 96.4% |
| Ramshot Magnum | <<locked>> | 80% | 31,952 psi | 68% | 2395 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,703 psi | 61% | 1578 fps | 100% |
| ReloadSwiss RS 76 | 59 gr | 80% | 29,834 psi | 63% | 2411 fps | 96.7% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 38,551 psi | 82% | 2615 fps | 95.9% |
| Vihtavuori N165 | <<locked>> | 80% | 36,332 psi | 77% | 2425 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 82% | 35,027 psi | 74% | 2470 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,199 psi | 70% | 2526 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,377 psi | 81% | 2477 fps | 97.9% |
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 28 powders for .280 Riml. N.E. Ross loaded with the .284 | 174gr | Prvi Partizan PSP BT. ReloadSwiss RS 76 delivers the highest muzzle velocity at 2,730 fps; across all powders the maximum-charge window runs from 1,726 fps to 2,730 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 28 of the 28 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 174.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. 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, ADI AR 2225 rank at the top here: for .280 Riml. N.E. Ross with the .284 | 174gr | Prvi Partizan PSP BT 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.