Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 175gr | A-Square MONO RN bullet and 21 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma 217, ReloadSwiss RS 80 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 |
|---|---|---|---|---|---|---|
| ADI AR 2217 | <<locked>> | 90% | 42,250 psi | 90% | 2638 fps | 98.6% |
| ADI AR 2225 | <<locked>> | 92% | 40,944 psi | 87% | 2664 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 42,235 psi | 90% | 2654 fps | 100% |
| Bofors RP15 | <<locked>> | 82% | 40,901 psi | 87% | 2595 fps | 98.8% |
| Bofors RP30 | <<locked>> | 88% | 42,076 psi | 89% | 2651 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 86% | 40,335 psi | 86% | 2598 fps | 98.6% |
| Hodgdon Retumbo | <<locked>> | 86% | 41,321 psi | 88% | 2710 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 80% | 1755 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 42,148 psi | 89% | 2641 fps | 98.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 40,103 psi | 85% | 2638 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 40,437 psi | 86% | 2513 fps | 99.9% |
| Norma 217 | <<locked>> | 94% | 40,640 psi | 86% | 2664 fps | 99.7% |
| Ramshot Grand | <<locked>> | 82% | 42,061 psi | 89% | 2651 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 84% | 40,683 psi | 86% | 2592 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,682 psi | 82% | 1798 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 40,799 psi | 87% | 2694 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 39,987 psi | 85% | 2644 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 82% | 42,134 psi | 89% | 2549 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 84% | 41,278 psi | 88% | 2612 fps | 97.8% |
| Vihtavuori N568 | <<locked>> | 88% | 41,394 psi | 88% | 2661 fps | 96.6% |
| Winchester StaBALL HD | <<locked>> | 82% | 40,611 psi | 86% | 2657 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2217 | <<locked>> | 82% | 32,242 psi | 68% | 2402 fps | 95.1% |
| ADI AR 2225 | 59.2 gr | 80% | 27,688 psi | 59% | 2320 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,476 psi | 73% | 2487 fps | 99.7% |
| Bofors RP15 | <<locked>> | 80% | 38,363 psi | 81% | 2543 fps | 98.2% |
| Bofors RP30 | <<locked>> | 80% | 31,966 psi | 68% | 2418 fps | 95.4% |
| Hodgdon H1000 | <<locked>> | 80% | 32,808 psi | 70% | 2421 fps | 96.1% |
| Hodgdon Retumbo | <<locked>> | 80% | 33,779 psi | 72% | 2526 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,224 psi | 60% | 1565 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 39,276 psi | 83% | 2579 fps | 97.5% |
| IMR 8133 Enduron | <<locked>> | 88% | 32,822 psi | 70% | 2464 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 35,578 psi | 75% | 2411 fps | 99.4% |
| Norma 217 | 59.4 gr | 82% | 26,977 psi | 57% | 2316 fps | 95% |
| Ramshot Grand | <<locked>> | 80% | 39,160 psi | 83% | 2592 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 80% | 35,070 psi | 74% | 2474 fps | 98.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,993 psi | 62% | 1604 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 32,750 psi | 69% | 2500 fps | 98.5% |
| ReloadSwiss RS 80 | 68.6 gr | 86% | 37,086 psi | 79% | 2582 fps | 95.8% |
| Vihtavuori N165 | <<locked>> | 80% | 39,363 psi | 84% | 2493 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 35,911 psi | 76% | 2493 fps | 96.1% |
| Vihtavuori N568 | <<locked>> | 86% | 38,421 psi | 82% | 2595 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,594 psi | 80% | 2602 fps | 100% |
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 29 powders for .280 Riml. N.E. Ross loaded with the .284 | 175gr | A-Square MONO RN. Hodgdon Retumbo delivers the highest muzzle velocity at 2,710 fps; across all powders the maximum-charge window runs from 1,755 fps to 2,710 fps. Accurate 8700 gives the best case fill at 100 %, and 29 of the 29 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 80–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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. Norma 217, ReloadSwiss RS 80, ADI AR 2225 rank at the top here: for .280 Riml. N.E. Ross with the .284 | 175gr | A-Square MONO RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, ADI AR 2218, Alliant Reloder-50 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.