Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 160gr | Speer TBBC bullet and 36 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 Alliant Reloder-25.
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% | 40,393 psi | 86% | 2608 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 82% | 41,930 psi | 89% | 2680 fps | 97.9% |
| ADI AR 2213 | <<locked>> | 84% | 40,045 psi | 85% | 2674 fps | 96.1% |
| ADI AR 2217 | <<locked>> | 94% | 41,365 psi | 88% | 2700 fps | 96.9% |
| ADI AR 2225 | <<locked>> | 98% | 42,235 psi | 90% | 2785 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 82% | 41,930 psi | 89% | 2677 fps | 97.9% |
| Alliant Reloder-22 | <<locked>> | 84% | 40,219 psi | 85% | 2680 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 41,495 psi | 88% | 2684 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 40,886 psi | 87% | 2730 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 82% | 39,943 psi | 85% | 2730 fps | 100% |
| Bofors RP15 | <<locked>> | 86% | 39,900 psi | 85% | 2674 fps | 97.4% |
| Bofors RP30 | <<locked>> | 92% | 40,292 psi | 85% | 2713 fps | 97% |
| Bofors RP5 | <<locked>> | 84% | 40,219 psi | 85% | 2680 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 92% | 42,264 psi | 90% | 2723 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,003 psi | 89% | 2661 fps | 96.1% |
| Hodgdon Retumbo | <<locked>> | 92% | 42,598 psi | 90% | 2835 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 79% | 1795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,669 psi | 88% | 2618 fps | 96.2% |
| IMR 7828 SSC | <<locked>> | 86% | 41,234 psi | 87% | 2710 fps | 96.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,582 psi | 86% | 2743 fps | 97% |
| Lovex S071 | <<locked>> | 90% | 41,829 psi | 89% | 2638 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 40,625 psi | 86% | 2769 fps | 98.9% |
| Norma MRP | <<locked>> | 84% | 42,409 psi | 90% | 2756 fps | 99.2% |
| Ramshot Grand | <<locked>> | 86% | 40,988 psi | 87% | 2723 fps | 97% |
| Ramshot Magnum | <<locked>> | 90% | 42,308 psi | 90% | 2723 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,072 psi | 81% | 1837 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 42,235 psi | 90% | 2822 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 82% | 41,379 psi | 88% | 2664 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 41,031 psi | 87% | 2661 fps | 97.8% |
| Somchem S385 | <<locked>> | 82% | 41,829 psi | 89% | 2641 fps | 98.6% |
| Vihtavuori N165 | <<locked>> | 86% | 41,539 psi | 88% | 2628 fps | 98.3% |
| Vihtavuori N555 | <<locked>> | 82% | 40,611 psi | 86% | 2654 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 42,453 psi | 90% | 2743 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 90% | 42,627 psi | 90% | 2736 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 40,915 psi | 87% | 2792 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 41,089 psi | 87% | 2628 fps | 97.7% |
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% | 35,215 psi | 75% | 2500 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 80% | 39,160 psi | 83% | 2621 fps | 97.2% |
| ADI AR 2213 | <<locked>> | 82% | 37,449 psi | 79% | 2612 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 92% | 38,638 psi | 82% | 2638 fps | 96% |
| ADI AR 2225 | <<locked>> | 88% | 30,603 psi | 65% | 2484 fps | 95.9% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,233 psi | 83% | 2618 fps | 97.2% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,056 psi | 74% | 2562 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,794 psi | 72% | 2523 fps | 100% |
| Alliant Reloder-25 | 54.6 gr | 80% | 29,414 psi | 62% | 2441 fps | 97.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,202 psi | 79% | 2671 fps | 99.7% |
| Bofors RP15 | <<locked>> | 82% | 34,983 psi | 74% | 2559 fps | 95.8% |
| Bofors RP30 | <<locked>> | 88% | 35,099 psi | 74% | 2595 fps | 95.2% |
| Bofors RP5 | <<locked>> | 80% | 35,056 psi | 74% | 2562 fps | 96% |
| Hodgdon H1000 | <<locked>> | 88% | 36,898 psi | 78% | 2602 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 82% | 39,233 psi | 83% | 2602 fps | 95.2% |
| Hodgdon Retumbo | 58 gr | 84% | 32,779 psi | 70% | 2579 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,847 psi | 59% | 1604 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,044 psi | 83% | 2562 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 84% | 38,522 psi | 82% | 2651 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 35,607 psi | 76% | 2628 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 30,501 psi | 65% | 2379 fps | 96.9% |
| Norma 217 | <<locked>> | 92% | 31,183 psi | 66% | 2533 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 36,709 psi | 78% | 2631 fps | 97.9% |
| Ramshot Grand | <<locked>> | 82% | 35,650 psi | 76% | 2595 fps | 95% |
| Ramshot Magnum | <<locked>> | 82% | 31,691 psi | 67% | 2474 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,587 psi | 61% | 1644 fps | 100% |
| ReloadSwiss RS 76 | 60.6 gr | 82% | 29,704 psi | 63% | 2487 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 38,609 psi | 82% | 2605 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,290 psi | 81% | 2602 fps | 97.1% |
| Somchem S385 | <<locked>> | 80% | 39,131 psi | 83% | 2585 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 80% | 33,910 psi | 72% | 2461 fps | 96.1% |
| Vihtavuori N555 | <<locked>> | 80% | 38,058 psi | 81% | 2602 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 39,682 psi | 84% | 2684 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 37,231 psi | 79% | 2618 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,081 psi | 64% | 2552 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,824 psi | 76% | 2513 fps | 96.2% |
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 36 powders for .280 Riml. N.E. Ross loaded with the .284 | 160gr | Speer TBBC. Hodgdon Retumbo delivers the highest muzzle velocity at 2,835 fps; across all powders the maximum-charge window runs from 1,795 fps to 2,835 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 36 of the 36 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 1:10.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, IMR 8133 Enduron, Norma 217 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, Alliant Reloder-25 rank at the top here: for .280 Riml. N.E. Ross with the .284 | 160gr | Speer TBBC 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.