Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 148gr | TWENTY-NINE ERTP bullet and 33 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 Winchester StaBALL HD.
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>> | 88% | 41,887 psi | 89% | 2730 fps | 99.1% |
| Accurate High Country | <<locked>> | 86% | 42,598 psi | 90% | 2854 fps | 96.2% |
| ADI AR 2209 | <<locked>> | 84% | 41,133 psi | 87% | 2753 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,901 psi | 87% | 2838 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,408 psi | 88% | 2753 fps | 96.8% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 41,408 psi | 88% | 2753 fps | 96.8% |
| Alliant Reloder-19 | <<locked>> | 84% | 41,046 psi | 87% | 2746 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 41,858 psi | 89% | 2808 fps | 97.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 39,943 psi | 85% | 2756 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 42,206 psi | 90% | 2848 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 86% | 41,466 psi | 88% | 2861 fps | 99.8% |
| Bofors RP15 | <<locked>> | 90% | 41,292 psi | 88% | 2795 fps | 96.8% |
| Bofors RP30 | <<locked>> | 96% | 41,321 psi | 88% | 2831 fps | 96.3% |
| Bofors RP5 | <<locked>> | 88% | 41,858 psi | 89% | 2808 fps | 97.2% |
| Hodgdon H1000 | <<locked>> | 94% | 41,321 psi | 88% | 2782 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 41,684 psi | 88% | 2713 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 41,307 psi | 88% | 2887 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 78% | 1847 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 40,640 psi | 86% | 2703 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 36,376 psi | 77% | 2756 fps | 96.7% |
| Norma MRP | <<locked>> | 86% | 41,060 psi | 87% | 2822 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 92% | 40,973 psi | 87% | 2782 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,710 psi | 80% | 1893 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 40,988 psi | 87% | 2877 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 84% | 42,569 psi | 90% | 2730 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 84% | 40,306 psi | 86% | 2730 fps | 96.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,987 psi | 85% | 2726 fps | 96.6% |
| Somchem S365 | <<locked>> | 82% | 42,032 psi | 89% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 41,060 psi | 87% | 2717 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 88% | 40,379 psi | 86% | 2694 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 86% | 42,119 psi | 89% | 2782 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 41,539 psi | 88% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,190 psi | 85% | 2694 fps | 96.5% |
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% | 32,068 psi | 68% | 2507 fps | 96.5% |
| Accurate High Country | <<locked>> | 84% | 39,697 psi | 84% | 2789 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 82% | 38,580 psi | 82% | 2694 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 94% | 33,678 psi | 71% | 2651 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,477 psi | 77% | 2638 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,477 psi | 77% | 2638 fps | 95.1% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,143 psi | 77% | 2635 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 84% | 36,608 psi | 78% | 2687 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,719 psi | 65% | 2536 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 28,703 psi | 61% | 2493 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,257 psi | 71% | 2667 fps | 98.3% |
| Bofors RP15 | <<locked>> | 86% | 36,347 psi | 77% | 2680 fps | 95.1% |
| Bofors RP30 | <<locked>> | 94% | 38,711 psi | 82% | 2769 fps | 95.4% |
| Bofors RP5 | <<locked>> | 84% | 36,608 psi | 78% | 2687 fps | 95.4% |
| Hodgdon H1000 | <<locked>> | 92% | 38,551 psi | 82% | 2717 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,972 psi | 83% | 2657 fps | 100% |
| Hodgdon Retumbo | 60.8 gr | 90% | 36,245 psi | 77% | 2756 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 59% | 1654 fps | 100% |
| Lovex S071 | <<locked>> | 82% | 29,414 psi | 62% | 2434 fps | 95.3% |
| Norma 217 | <<locked>> | 98% | 33,953 psi | 72% | 2690 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 33,272 psi | 71% | 2631 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 88% | 35,563 psi | 75% | 2657 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,268 psi | 60% | 1696 fps | 100% |
| ReloadSwiss RS 76 | 63.6 gr | 88% | 33,112 psi | 70% | 2664 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 82% | 39,972 psi | 85% | 2674 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 82% | 37,768 psi | 80% | 2674 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,420 psi | 79% | 2667 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 39,276 psi | 83% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,824 psi | 76% | 2598 fps | 96.1% |
| Vihtavuori N165 | <<locked>> | 84% | 35,346 psi | 75% | 2582 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 34,403 psi | 73% | 2615 fps | 99.1% |
| Winchester StaBALL HD | 55.5 gr | 80% | 27,209 psi | 58% | 2539 fps | 99.1% |
| Winchester Supreme 780 | <<locked>> | 84% | 37,463 psi | 79% | 2638 fps | 95.6% |
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 33 powders for .280 Riml. N.E. Ross loaded with the .284 | 148gr | TWENTY-NINE ERTP. Winchester StaBALL HD delivers the highest muzzle velocity at 2,920 fps; across all powders the maximum-charge window runs from 1,847 fps to 2,920 fps. ADI AR 2225 gives the best case fill at 100 %, and 33 of the 33 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 77–90 %, leaving at least 10 % headroom. The 148.0 gr projectile in 0.284" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Hodgdon TrailBoss, 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, Winchester StaBALL HD rank at the top here: for .280 Riml. N.E. Ross with the .284 | 148gr | TWENTY-NINE ERTP 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.