Load Specifications
Load data in caliber 7 mm Rem. Ultra Mag. with .285 | 173gr | Prvi Partizan SP bullet and 38 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2218, Vihtavuori N570 and Alliant Reloder-50.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 56,956 psi | 89% | 2720 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 54,549 psi | 85% | 2779 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 82% | 56,826 psi | 89% | 2825 fps | 100% |
| ADI AR 2217 | <<locked>> | 90% | 56,985 psi | 89% | 2815 fps | 100% |
| ADI AR 2218 | <<locked>> | 92% | 54,099 psi | 85% | 2884 fps | 99.5% |
| ADI AR 2225 | <<locked>> | 92% | 57,580 psi | 90% | 2838 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 82% | 57,464 psi | 90% | 2818 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 82% | 55,825 psi | 87% | 2723 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 86% | 57,159 psi | 90% | 2799 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 56,391 psi | 88% | 2858 fps | 99.4% |
| Alliant Reloder-50 | <<locked>> | 94% | 57,014 psi | 89% | 2858 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 56,652 psi | 89% | 2785 fps | 99.5% |
| Bofors RP15 | <<locked>> | 84% | 57,072 psi | 89% | 2812 fps | 100% |
| Bofors RP30 | <<locked>> | 88% | 57,246 psi | 90% | 2828 fps | 100% |
| Bofors RP5 | <<locked>> | 82% | 57,464 psi | 90% | 2818 fps | 100% |
| Hodgdon H1000 | <<locked>> | 86% | 54,418 psi | 85% | 2776 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 57,406 psi | 90% | 2894 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,159 psi | 60% | 1837 fps | 100% |
| IMR 7828 SSC | <<locked>> | 82% | 55,666 psi | 87% | 2812 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 88% | 57,522 psi | 90% | 2753 fps | 97.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 56,521 psi | 89% | 2831 fps | 100% |
| Lovex D100 | <<locked>> | 90% | 55,506 psi | 87% | 2743 fps | 96.1% |
| Lovex S071 | <<locked>> | 86% | 55,767 psi | 87% | 2707 fps | 100% |
| Norma 217 | <<locked>> | 92% | 54,462 psi | 85% | 2795 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 57,377 psi | 90% | 2835 fps | 100% |
| Ramshot Magnum | <<locked>> | 84% | 55,825 psi | 87% | 2762 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,363 psi | 62% | 1880 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 54,128 psi | 85% | 2818 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 57,334 psi | 90% | 2858 fps | 100% |
| Shooters World 50 BMG | <<locked>> | 90% | 55,506 psi | 87% | 2743 fps | 96.1% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 56,130 psi | 88% | 2785 fps | 98.8% |
| Vihtavuori 20N29ᴾ | <<locked>> | 100% | 53,432 psi | 84% | 2759 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 84% | 57,566 psi | 90% | 2743 fps | 100% |
| Vihtavuori N170 | <<locked>> | 88% | 57,377 psi | 90% | 2785 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 84% | 54,969 psi | 86% | 2785 fps | 100% |
| Vihtavuori N568 | <<locked>> | 88% | 57,493 psi | 90% | 2861 fps | 99.9% |
| Vihtavuori N570 | <<locked>> | 88% | 55,172 psi | 86% | 2864 fps | 99% |
| Winchester Supreme 780 | <<locked>> | 82% | 57,130 psi | 90% | 2753 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 53,287 psi | 84% | 2671 fps | 100% |
| Accurate 8700 | <<locked>> | 90% | 40,495 psi | 63% | 2533 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 80% | 53,069 psi | 83% | 2769 fps | 100% |
| ADI AR 2217 | <<locked>> | 80% | 40,016 psi | 63% | 2536 fps | 98.9% |
| ADI AR 2218 | 85.6 gr | 84% | 40,016 psi | 63% | 2605 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 37,376 psi | 59% | 2510 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 53,780 psi | 84% | 2766 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 80% | 52,388 psi | 82% | 2677 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 46,543 psi | 73% | 2648 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 80% | 38,624 psi | 61% | 2536 fps | 95.1% |
| Alliant Reloder-50 | 89 gr | 86% | 42,453 psi | 67% | 2605 fps | 95.9% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 49,734 psi | 78% | 2677 fps | 98.6% |
| Bofors RP15 | <<locked>> | 80% | 49,995 psi | 78% | 2707 fps | 100% |
| Bofors RP30 | <<locked>> | 80% | 43,482 psi | 68% | 2608 fps | 99.5% |
| Bofors RP5 | <<locked>> | 80% | 53,780 psi | 84% | 2766 fps | 100% |
| Hodgdon H1000 | <<locked>> | 80% | 43,729 psi | 69% | 2605 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 80% | 46,035 psi | 72% | 2723 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,747 psi | 45% | 1650 fps | 100% |
| IMR 7828 SSC | <<locked>> | 80% | 51,938 psi | 81% | 2759 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 84% | 50,502 psi | 79% | 2641 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 80% | 34,940 psi | 55% | 2438 fps | 97.3% |
| Lovex D100 | <<locked>> | 88% | 51,793 psi | 81% | 2684 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 46,108 psi | 72% | 2566 fps | 100% |
| Norma 217 | <<locked>> | 80% | 35,708 psi | 56% | 2464 fps | 99.2% |
| Ramshot Grand | <<locked>> | 80% | 53,229 psi | 83% | 2776 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 48,167 psi | 75% | 2651 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,602 psi | 46% | 1686 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 46,195 psi | 72% | 2700 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 42,380 psi | 66% | 2605 fps | 98.3% |
| Shooters World 50 BMG | <<locked>> | 88% | 51,793 psi | 81% | 2684 fps | 95.1% |
| SNPE Vectan SP 13 | <<locked>> | 90% | 42,598 psi | 67% | 2556 fps | 95.7% |
| Vihtavuori 20N29 | <<locked>> | 96% | 46,253 psi | 72% | 2638 fps | 95.1% |
| Vihtavuori N165 | <<locked>> | 80% | 50,488 psi | 79% | 2644 fps | 100% |
| Vihtavuori N170 | <<locked>> | 80% | 43,700 psi | 68% | 2556 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 80% | 47,979 psi | 75% | 2671 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 80% | 43,178 psi | 68% | 2618 fps | 98.1% |
| Vihtavuori N570 | 79.8 gr | 80% | 41,191 psi | 65% | 2608 fps | 95.6% |
| Winchester Supreme 780 | <<locked>> | 80% | 53,417 psi | 84% | 2700 fps | 100% |
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 38 powders for 7 mm Rem. Ultra Mag. loaded with the .285 | 173gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 2,894 fps; across all powders the maximum-charge window runs from 1,837 fps to 2,894 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 38 of the 38 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.285" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori 20N29 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. ADI AR 2218, Vihtavuori N570, Alliant Reloder-50 rank at the top here: for 7 mm Rem. Ultra Mag. with the .285 | 173gr | Prvi Partizan SP 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.