Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 170gr | Hammer HHT bullet and 39 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Hodgdon Retumbo and ReloadSwiss RS 76.
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>> | 86% | 42,206 psi | 90% | 2559 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 41,278 psi | 88% | 2582 fps | 98% |
| ADI AR 2213 | <<locked>> | 86% | 41,974 psi | 89% | 2628 fps | 97.1% |
| ADI AR 2217 | <<locked>> | 94% | 40,335 psi | 86% | 2592 fps | 96.9% |
| ADI AR 2225 | <<locked>> | 98% | 41,147 psi | 87% | 2677 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 41,452 psi | 88% | 2579 fps | 98.1% |
| Alliant Reloder-19 | <<locked>> | 82% | 41,075 psi | 87% | 2572 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 86% | 42,076 psi | 89% | 2635 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 86% | 40,437 psi | 86% | 2579 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 90% | 39,943 psi | 85% | 2625 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 84% | 42,018 psi | 89% | 2687 fps | 100% |
| Bofors RP15 | <<locked>> | 88% | 41,727 psi | 89% | 2628 fps | 98.2% |
| Bofors RP30 | <<locked>> | 94% | 42,032 psi | 89% | 2671 fps | 97.8% |
| Bofors RP5 | <<locked>> | 86% | 42,076 psi | 89% | 2635 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 92% | 41,437 psi | 88% | 2621 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 84% | 42,003 psi | 89% | 2575 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,147 psi | 87% | 2559 fps | 96.2% |
| Hodgdon Retumbo | <<locked>> | 92% | 41,640 psi | 88% | 2726 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 79% | 1716 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,060 psi | 87% | 2520 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 86% | 40,495 psi | 86% | 2612 fps | 96.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,407 psi | 84% | 2638 fps | 97% |
| Lovex S071 | <<locked>> | 90% | 40,915 psi | 87% | 2536 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 39,610 psi | 84% | 2664 fps | 99% |
| Norma MRP | <<locked>> | 84% | 41,452 psi | 88% | 2651 fps | 99.2% |
| Ramshot Grand | <<locked>> | 86% | 40,016 psi | 85% | 2615 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 90% | 41,278 psi | 88% | 2618 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,014 psi | 81% | 1759 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 41,147 psi | 87% | 2713 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 82% | 42,569 psi | 90% | 2556 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 82% | 40,437 psi | 86% | 2559 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 40,089 psi | 85% | 2556 fps | 97.9% |
| Somchem S385 | <<locked>> | 82% | 41,031 psi | 87% | 2543 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 86% | 40,582 psi | 86% | 2526 fps | 98.4% |
| Vihtavuori N555 | <<locked>> | 84% | 42,496 psi | 90% | 2605 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 41,553 psi | 88% | 2641 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 90% | 41,597 psi | 88% | 2631 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 88% | 39,726 psi | 84% | 2690 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 40,350 psi | 86% | 2530 fps | 97.8% |
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% | 34,606 psi | 73% | 2405 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 80% | 38,566 psi | 82% | 2523 fps | 97.3% |
| ADI AR 2213 | <<locked>> | 82% | 36,738 psi | 78% | 2513 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 90% | 35,505 psi | 75% | 2484 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 88% | 29,878 psi | 63% | 2392 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,015 psi | 83% | 2526 fps | 97.5% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,653 psi | 82% | 2523 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,360 psi | 73% | 2467 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,083 psi | 70% | 2428 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,892 psi | 61% | 2349 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,129 psi | 77% | 2566 fps | 99.8% |
| Bofors RP15 | <<locked>> | 80% | 32,068 psi | 68% | 2405 fps | 95% |
| Bofors RP30 | <<locked>> | 88% | 34,287 psi | 73% | 2497 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 34,360 psi | 73% | 2467 fps | 96.2% |
| Hodgdon H1000 | <<locked>> | 86% | 33,924 psi | 72% | 2444 fps | 95.1% |
| Hodgdon H4831 | <<locked>> | 82% | 39,305 psi | 83% | 2520 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 82% | 38,493 psi | 82% | 2503 fps | 95.3% |
| Hodgdon Retumbo | 54.3 gr | 84% | 32,039 psi | 68% | 2480 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 59% | 1532 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,508 psi | 82% | 2467 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 84% | 37,855 psi | 80% | 2552 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 96% | 34,635 psi | 73% | 2526 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 29,863 psi | 63% | 2290 fps | 97% |
| Norma 217 | <<locked>> | 92% | 30,443 psi | 65% | 2438 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 35,940 psi | 76% | 2533 fps | 98.1% |
| Ramshot Grand | <<locked>> | 82% | 34,896 psi | 74% | 2497 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 82% | 31,067 psi | 66% | 2382 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,543 psi | 61% | 1572 fps | 100% |
| ReloadSwiss RS 76 | 56.8 gr | 82% | 29,080 psi | 62% | 2395 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 39,842 psi | 85% | 2500 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 37,971 psi | 81% | 2507 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,637 psi | 80% | 2503 fps | 97.2% |
| Somchem S385 | <<locked>> | 80% | 38,435 psi | 82% | 2487 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 80% | 33,388 psi | 71% | 2372 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 80% | 37,318 psi | 79% | 2503 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 38,653 psi | 82% | 2579 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 86% | 36,245 psi | 77% | 2516 fps | 95.1% |
| Winchester StaBALL HD | 53.1 gr | 80% | 29,385 psi | 62% | 2457 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,998 psi | 74% | 2415 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 39 powders for .280 Riml. N.E. Ross loaded with the .284 | 170gr | Hammer HHT. Hodgdon Retumbo delivers the highest muzzle velocity at 2,726 fps; across all powders the maximum-charge window runs from 1,716 fps to 2,726 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 39 of the 39 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 170.0 gr projectile in 0.284" calls for a 1:8.0 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .280 Riml. N.E. Ross with the .284 | 170gr | Hammer HHT 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.