Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 150gr | Swift Scirocco bullet and 29 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% | 40,335 psi | 86% | 2684 fps | 99% |
| ADI AR 2209 | <<locked>> | 84% | 42,351 psi | 90% | 2766 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,974 psi | 89% | 2851 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 84% | 42,264 psi | 90% | 2759 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 40,335 psi | 86% | 2762 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 88% | 41,307 psi | 88% | 2766 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 40,785 psi | 87% | 2805 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 84% | 39,958 psi | 85% | 2815 fps | 99.8% |
| Bofors RP15 | <<locked>> | 90% | 42,641 psi | 90% | 2808 fps | 97.4% |
| Bofors RP30 | <<locked>> | 96% | 42,641 psi | 90% | 2844 fps | 96.9% |
| Bofors RP5 | <<locked>> | 86% | 40,335 psi | 86% | 2762 fps | 96.9% |
| Hodgdon H1000 | <<locked>> | 94% | 42,409 psi | 90% | 2795 fps | 97% |
| Hodgdon Retumbo | <<locked>> | 94% | 42,496 psi | 90% | 2904 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,043 psi | 79% | 1847 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 41,771 psi | 89% | 2713 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 37,521 psi | 80% | 2772 fps | 97.4% |
| Norma MRP | <<locked>> | 86% | 42,395 psi | 90% | 2835 fps | 98.7% |
| Ramshot Grand | <<locked>> | 88% | 41,205 psi | 87% | 2799 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 92% | 42,438 psi | 90% | 2802 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,739 psi | 80% | 1890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 42,264 psi | 90% | 2897 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 84% | 41,437 psi | 88% | 2743 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 41,075 psi | 87% | 2736 fps | 97.1% |
| Somchem S385 | <<locked>> | 84% | 42,134 psi | 89% | 2726 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 88% | 41,611 psi | 88% | 2707 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 84% | 40,466 psi | 86% | 2733 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 92% | 42,351 psi | 90% | 2808 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 90% | 40,277 psi | 85% | 2874 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,423 psi | 88% | 2710 fps | 97.1% |
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% | 32,909 psi | 70% | 2513 fps | 97% |
| ADI AR 2209 | <<locked>> | 80% | 36,941 psi | 78% | 2641 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 92% | 32,590 psi | 69% | 2608 fps | 95.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,927 psi | 78% | 2641 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,143 psi | 75% | 2638 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,691 psi | 67% | 2549 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 27,615 psi | 59% | 2444 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,301 psi | 73% | 2680 fps | 98.8% |
| Bofors RP15 | <<locked>> | 86% | 37,347 psi | 79% | 2690 fps | 95.8% |
| Bofors RP30 | <<locked>> | 92% | 37,304 psi | 79% | 2723 fps | 95.1% |
| Bofors RP5 | <<locked>> | 82% | 35,143 psi | 75% | 2638 fps | 95.1% |
| Hodgdon H1000 | <<locked>> | 90% | 37,188 psi | 79% | 2674 fps | 95% |
| Hodgdon Retumbo | 60.3 gr | 88% | 34,940 psi | 74% | 2710 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 59% | 1650 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 28,442 psi | 60% | 2395 fps | 95.1% |
| Norma 217 | <<locked>> | 96% | 32,895 psi | 70% | 2648 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 34,243 psi | 73% | 2644 fps | 96.3% |
| Ramshot Grand | <<locked>> | 86% | 38,406 psi | 81% | 2733 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 86% | 34,185 psi | 73% | 2608 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,224 psi | 60% | 1686 fps | 100% |
| ReloadSwiss RS 76 | 63.1 gr | 86% | 31,879 psi | 68% | 2618 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 80% | 36,245 psi | 77% | 2625 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 35,911 psi | 76% | 2618 fps | 95.4% |
| Somchem S385 | <<locked>> | 80% | 36,825 psi | 78% | 2608 fps | 96.7% |
| Vihtavuori N165 | <<locked>> | 82% | 34,098 psi | 72% | 2536 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 35,505 psi | 75% | 2625 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 90% | 39,581 psi | 84% | 2746 fps | 95% |
| Winchester StaBALL HD | 56.3 gr | 80% | 28,036 psi | 59% | 2556 fps | 99.6% |
| Winchester Supreme 780 | <<locked>> | 82% | 36,027 psi | 76% | 2589 fps | 95.3% |
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 43 powders for .280 Riml. N.E. Ross loaded with the .284 | 150gr | Swift Scirocco. Hodgdon Retumbo delivers the highest muzzle velocity at 2,904 fps; across all powders the maximum-charge window runs from 1,847 fps to 2,904 fps. ADI AR 2225 gives the best case fill at 100 %, and 43 of the 43 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 150.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Hodgdon TrailBoss, IMR 8133 Enduron 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 | 150gr | Swift Scirocco they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Hodgdon H4831 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.