Load Specifications
Load data in caliber .280 Riml. N.E. Ross with .284 | 145gr | Hasler ARIETE bullet and 33 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 40,016 psi | 85% | 2723 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 86% | 42,511 psi | 90% | 2812 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,073 psi | 83% | 2822 fps | 98% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 40,074 psi | 85% | 2756 fps | 96.2% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 40,074 psi | 85% | 2756 fps | 96.2% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,279 psi | 90% | 2805 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,089 psi | 85% | 2799 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 40,988 psi | 87% | 2808 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 40,596 psi | 86% | 2844 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 88% | 42,656 psi | 90% | 2917 fps | 99.9% |
| Bofors RP15 | <<locked>> | 92% | 42,424 psi | 90% | 2848 fps | 97% |
| Bofors RP30 | <<locked>> | 98% | 42,279 psi | 90% | 2881 fps | 96.4% |
| Bofors RP5 | <<locked>> | 88% | 40,089 psi | 85% | 2799 fps | 96.4% |
| Hodgdon H1000 | <<locked>> | 96% | 42,554 psi | 90% | 2835 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 40,016 psi | 85% | 2713 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 42,322 psi | 90% | 2943 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,738 psi | 78% | 1870 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 42,076 psi | 89% | 2766 fps | 99.8% |
| Lovex S071 | <<locked>> | 94% | 41,263 psi | 88% | 2749 fps | 98.8% |
| Norma MRP | <<locked>> | 88% | 42,134 psi | 89% | 2877 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 82% | 42,453 psi | 90% | 2808 fps | 99% |
| Ramshot Magnum | <<locked>> | 94% | 42,279 psi | 90% | 2838 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,362 psi | 79% | 1913 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 42,612 psi | 90% | 2864 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 42,076 psi | 89% | 2933 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 86% | 41,510 psi | 88% | 2789 fps | 96.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,147 psi | 87% | 2782 fps | 96.7% |
| Somchem S365 | <<locked>> | 82% | 40,190 psi | 85% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 41,916 psi | 89% | 2766 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 90% | 41,510 psi | 88% | 2749 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 86% | 40,118 psi | 85% | 2776 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 39,479 psi | 84% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,394 psi | 88% | 2753 fps | 96.6% |
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% | 30,197 psi | 64% | 2490 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 82% | 37,115 psi | 79% | 2690 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 34,287 psi | 73% | 2694 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 37,362 psi | 79% | 2690 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 37,362 psi | 79% | 2690 fps | 95.2% |
| Alliant Reloder-19 | <<locked>> | 82% | 36,999 psi | 78% | 2684 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 86% | 37,333 psi | 79% | 2736 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,211 psi | 62% | 2523 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 29,211 psi | 62% | 2539 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,473 psi | 67% | 2648 fps | 97.5% |
| Bofors RP15 | <<locked>> | 88% | 37,028 psi | 79% | 2726 fps | 95.1% |
| Bofors RP30 | <<locked>> | 96% | 39,552 psi | 84% | 2818 fps | 95.4% |
| Bofors RP5 | <<locked>> | 86% | 37,333 psi | 79% | 2736 fps | 95.4% |
| Hodgdon H1000 | <<locked>> | 94% | 39,624 psi | 84% | 2769 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,405 psi | 79% | 2657 fps | 99.9% |
| Hodgdon Retumbo | 62.5 gr | 92% | 37,057 psi | 79% | 2805 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,354 psi | 58% | 1670 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 39,407 psi | 84% | 2710 fps | 99.5% |
| Lovex S071 | <<locked>> | 84% | 29,573 psi | 63% | 2470 fps | 95.1% |
| Norma MRP | <<locked>> | 82% | 33,982 psi | 72% | 2680 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 39,624 psi | 84% | 2746 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 90% | 36,521 psi | 77% | 2710 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 59% | 1713 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,682 psi | 84% | 2799 fps | 99.3% |
| ReloadSwiss RS 76 | 65.4 gr | 90% | 33,808 psi | 72% | 2713 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 36,158 psi | 77% | 2667 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 38,305 psi | 81% | 2720 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 37,521 psi | 80% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,171 psi | 72% | 2589 fps | 95.2% |
| Vihtavuori N165 | <<locked>> | 86% | 36,245 psi | 77% | 2631 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 80% | 32,576 psi | 69% | 2602 fps | 98.5% |
| Winchester StaBALL HD | 55.8 gr | 80% | 25,672 psi | 54% | 2510 fps | 98.2% |
| Winchester Supreme 780 | <<locked>> | 86% | 38,537 psi | 82% | 2690 fps | 95.7% |
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 | 145gr | Hasler ARIETE. Hodgdon Retumbo delivers the highest muzzle velocity at 2,943 fps; across all powders the maximum-charge window runs from 1,870 fps to 2,943 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 78–90 %, leaving at least 10 % headroom. The 145.0 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, 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .280 Riml. N.E. Ross with the .284 | 145gr | Hasler ARIETE 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.