Load Specifications
Load data in caliber 7 mm Rem. Ultra Mag. with .284 | 158gr | Prvi Partizan Grom bullet and 51 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 IMR 8133 Enduron.
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>> | 84% | 56,782 psi | 89% | 2822 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 53,490 psi | 84% | 2854 fps | 98% |
| Accurate MAGPRO | <<locked>> | 82% | 56,057 psi | 88% | 2927 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 82% | 57,493 psi | 90% | 2907 fps | 100% |
| ADI AR 2213 | <<locked>> | 84% | 56,579 psi | 89% | 2923 fps | 100% |
| ADI AR 2217 | <<locked>> | 92% | 56,275 psi | 88% | 2907 fps | 100% |
| ADI AR 2218 | <<locked>> | 96% | 57,493 psi | 90% | 3031 fps | 99.4% |
| ADI AR 2225 | <<locked>> | 94% | 56,434 psi | 88% | 2930 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,624 psi | 90% | 2900 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 57,624 psi | 90% | 2900 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 57,058 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 84% | 57,174 psi | 90% | 2920 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 84% | 55,463 psi | 87% | 2828 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 88% | 56,376 psi | 88% | 2897 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 55,434 psi | 87% | 2943 fps | 98.7% |
| Alliant Reloder-50 | <<locked>> | 96% | 55,898 psi | 88% | 2936 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 56,681 psi | 89% | 2881 fps | 99% |
| Bofors RP15 | <<locked>> | 86% | 56,594 psi | 89% | 2910 fps | 100% |
| Bofors RP30 | <<locked>> | 90% | 56,420 psi | 88% | 2923 fps | 100% |
| Bofors RP5 | <<locked>> | 84% | 57,174 psi | 90% | 2920 fps | 100% |
| Hodgdon H1000 | <<locked>> | 90% | 57,682 psi | 90% | 2923 fps | 100% |
| Hodgdon H4831 | <<locked>> | 82% | 55,085 psi | 86% | 2858 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 54,128 psi | 85% | 2841 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 88% | 56,318 psi | 88% | 2992 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,000 psi | 60% | 1906 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 55,114 psi | 86% | 2835 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 84% | 55,259 psi | 87% | 2910 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 90% | 57,624 psi | 90% | 2841 fps | 96.4% |
| IMR 8133 Enduron | <<locked>> | 96% | 55,317 psi | 87% | 2913 fps | 100% |
| Lovex S071 | <<locked>> | 88% | 55,390 psi | 87% | 2802 fps | 100% |
| Norma 217 | <<locked>> | 96% | 56,869 psi | 89% | 2936 fps | 100% |
| Norma MRP | <<locked>> | 82% | 57,406 psi | 90% | 2930 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 56,768 psi | 89% | 2933 fps | 100% |
| Ramshot Magnum | <<locked>> | 86% | 55,317 psi | 87% | 2858 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,015 psi | 61% | 1949 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 57,232 psi | 90% | 2969 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 56,434 psi | 88% | 2943 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 82% | 57,566 psi | 90% | 2874 fps | 100% |
| Rottweil R 905 | <<locked>> | 82% | 56,956 psi | 89% | 2887 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 2864 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 56,579 psi | 89% | 2884 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 57,319 psi | 90% | 2858 fps | 100% |
| Vihtavuori N165 | <<locked>> | 86% | 57,508 psi | 90% | 2844 fps | 100% |
| Vihtavuori N170 | <<locked>> | 90% | 57,246 psi | 90% | 2874 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 82% | 57,014 psi | 89% | 2854 fps | 100% |
| Vihtavuori N560 | <<locked>> | 82% | 56,637 psi | 89% | 2936 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 86% | 54,462 psi | 85% | 2874 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 90% | 56,739 psi | 89% | 2949 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 90% | 54,244 psi | 85% | 2946 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 84% | 56,840 psi | 89% | 2913 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 84% | 57,116 psi | 90% | 2854 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% | 49,574 psi | 78% | 2717 fps | 100% |
| Accurate 8700 | <<locked>> | 94% | 42,540 psi | 67% | 2661 fps | 95% |
| Accurate MAGPRO | <<locked>> | 80% | 52,228 psi | 82% | 2864 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 80% | 53,693 psi | 84% | 2851 fps | 100% |
| ADI AR 2213 | <<locked>> | 80% | 48,994 psi | 77% | 2802 fps | 99.5% |
| ADI AR 2217 | <<locked>> | 80% | 36,709 psi | 58% | 2552 fps | 97.2% |
| ADI AR 2218 | 88.7 gr | 88% | 42,366 psi | 66% | 2746 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 34,055 psi | 53% | 2526 fps | 98.9% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,925 psi | 85% | 2848 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 53,925 psi | 85% | 2848 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 53,417 psi | 84% | 2841 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 80% | 49,748 psi | 78% | 2802 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 48,573 psi | 76% | 2730 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 42,699 psi | 67% | 2687 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 86% | 44,092 psi | 69% | 2740 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 90% | 44,454 psi | 70% | 2733 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 46,427 psi | 73% | 2707 fps | 97% |
| Bofors RP15 | <<locked>> | 80% | 46,383 psi | 73% | 2743 fps | 99.6% |
| Bofors RP30 | <<locked>> | 80% | 39,885 psi | 63% | 2628 fps | 98.1% |
| Bofors RP5 | <<locked>> | 80% | 49,748 psi | 78% | 2802 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 80% | 40,103 psi | 63% | 2631 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 80% | 51,285 psi | 80% | 2799 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 50,386 psi | 79% | 2782 fps | 99.3% |
| Hodgdon Retumbo | <<locked>> | 80% | 41,785 psi | 65% | 2743 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,514 psi | 45% | 1713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 51,648 psi | 81% | 2782 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 80% | 47,979 psi | 75% | 2789 fps | 99.4% |
| IMR 7977 Enduron | <<locked>> | 88% | 53,954 psi | 85% | 2785 fps | 95.6% |
| IMR 8133 Enduron | 75.9 gr | 82% | 33,968 psi | 53% | 2503 fps | 95.8% |
| Lovex S071 | <<locked>> | 80% | 42,757 psi | 67% | 2602 fps | 100% |
| Norma 217 | <<locked>> | 80% | 32,198 psi | 50% | 2474 fps | 97.3% |
| Norma MRP | <<locked>> | 80% | 53,403 psi | 84% | 2874 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 48,878 psi | 77% | 2808 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 80% | 44,077 psi | 69% | 2677 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,341 psi | 46% | 1752 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 41,785 psi | 65% | 2720 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 80% | 38,377 psi | 60% | 2612 fps | 96.2% |
| Rottweil R 904 | <<locked>> | 80% | 54,056 psi | 85% | 2822 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 80% | 53,200 psi | 83% | 2831 fps | 100% |
| SNPE Vectan SP 13 | <<locked>> | 94% | 44,672 psi | 70% | 2684 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 52,852 psi | 83% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 53,505 psi | 84% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 47,050 psi | 74% | 2687 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 84% | 46,659 psi | 73% | 2697 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 53,330 psi | 84% | 2802 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 52,721 psi | 83% | 2877 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 80% | 44,324 psi | 69% | 2700 fps | 98.5% |
| Vihtavuori N568 | <<locked>> | 80% | 39,334 psi | 62% | 2628 fps | 95.9% |
| Vihtavuori N570 | 83 gr | 84% | 43,555 psi | 68% | 2749 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 48,849 psi | 77% | 2802 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 49,850 psi | 78% | 2743 fps | 99.9% |
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 51 powders for 7 mm Rem. Ultra Mag. loaded with the .284 | 158gr | Prvi Partizan Grom. ADI AR 2218 delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,031 fps. Accurate 8700 gives the best case fill at 100 %, and 51 of the 51 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 158.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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. ADI AR 2218, Vihtavuori N570, IMR 8133 Enduron rank at the top here: for 7 mm Rem. Ultra Mag. with the .284 | 158gr | Prvi Partizan Grom 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.