Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Lapua Subsonic bullet and 60 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, 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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 56,217 psi | 87% | 2700 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,187 psi | 85% | 2799 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 86% | 57,363 psi | 88% | 2782 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 55,869 psi | 86% | 2795 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 58,523 psi | 90% | 2825 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 2877 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,159 psi | 88% | 2841 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 57,508 psi | 89% | 2779 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,624 psi | 89% | 2769 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 56,884 psi | 88% | 2772 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,333 psi | 87% | 2792 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 57,986 psi | 89% | 2749 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 58,465 psi | 90% | 2822 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 54,810 psi | 84% | 2782 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,739 psi | 87% | 2861 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,170 psi | 80% | 2782 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,507 psi | 87% | 2759 fps | 98.5% |
| Bofors RP15 | <<locked>> | 90% | 55,535 psi | 85% | 2779 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 58,204 psi | 90% | 2838 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 56,333 psi | 87% | 2792 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 55,970 psi | 86% | 2792 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 58,769 psi | 90% | 2785 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,769 psi | 89% | 2772 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 57,754 psi | 89% | 2694 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,464 psi | 88% | 2907 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,652 psi | 58% | 1765 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 55,927 psi | 86% | 2703 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 56,594 psi | 87% | 2707 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 55,405 psi | 85% | 2713 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 90% | 58,102 psi | 89% | 2835 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,388 psi | 81% | 2769 fps | 99.8% |
| Lovex S070 | <<locked>> | 82% | 58,175 psi | 90% | 2730 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 57,870 psi | 89% | 2720 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,261 psi | 88% | 2762 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 53,417 psi | 82% | 2792 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,376 psi | 87% | 2805 fps | 100% |
| Norma URP | <<locked>> | 82% | 58,218 psi | 90% | 2746 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 55,245 psi | 85% | 2799 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 57,246 psi | 88% | 2756 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 57,986 psi | 89% | 2785 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,609 psi | 59% | 1808 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 58,769 psi | 90% | 2894 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 57,914 psi | 89% | 2864 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 57,899 psi | 89% | 2753 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 56,637 psi | 87% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 58,175 psi | 90% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 58,639 psi | 90% | 2687 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,246 psi | 87% | 2759 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 55,753 psi | 86% | 2690 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 55,985 psi | 86% | 2700 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,058 psi | 88% | 2733 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,145 psi | 88% | 2720 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,159 psi | 86% | 2740 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 86% | 56,275 psi | 87% | 2733 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 55,825 psi | 86% | 2808 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 56,724 psi | 87% | 2799 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 58,523 psi | 90% | 2867 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 96% | 55,637 psi | 86% | 2864 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 90% | 58,421 psi | 90% | 2838 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,058 psi | 88% | 2733 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% | 42,931 psi | 66% | 2500 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 44,585 psi | 69% | 2621 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 46,949 psi | 72% | 2625 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 42,192 psi | 65% | 2569 fps | 97.9% |
| ADI AR 2217 | <<locked>> | 82% | 33,634 psi | 52% | 2379 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 94% | 43,976 psi | 68% | 2671 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 80% | 28,819 psi | 44% | 2293 fps | 96.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,282 psi | 73% | 2621 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 53,954 psi | 83% | 2720 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 46,833 psi | 72% | 2615 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 42,931 psi | 66% | 2572 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 41,713 psi | 64% | 2520 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,056 psi | 55% | 2461 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,123 psi | 73% | 2671 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,034 psi | 69% | 2667 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 96% | 44,846 psi | 69% | 2654 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 43,700 psi | 67% | 2543 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 39,943 psi | 61% | 2516 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 33,562 psi | 52% | 2395 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 42,931 psi | 66% | 2572 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 34,142 psi | 53% | 2392 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 80% | 44,802 psi | 69% | 2569 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 43,976 psi | 68% | 2552 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 50,705 psi | 78% | 2602 fps | 100% |
| Hodgdon Retumbo | 74.5 gr | 80% | 35,186 psi | 54% | 2497 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 44% | 1585 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 52,562 psi | 81% | 2657 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,098 psi | 82% | 2657 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 45,803 psi | 70% | 2559 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 40,886 psi | 63% | 2549 fps | 97.6% |
| IMR 8133 Enduron | <<locked>> | 88% | 34,606 psi | 53% | 2438 fps | 95.9% |
| Lovex S070 | <<locked>> | 80% | 54,679 psi | 84% | 2684 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,014 psi | 57% | 2388 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 53,490 psi | 82% | 2710 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 28,355 psi | 44% | 2293 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 45,556 psi | 70% | 2641 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 54,636 psi | 84% | 2700 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,017 psi | 63% | 2562 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 80% | 53,592 psi | 82% | 2707 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 36,883 psi | 57% | 2444 fps | 98.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,921 psi | 45% | 1621 fps | 100% |
| ReloadSwiss RS 76 | 79.7 gr | 80% | 34,418 psi | 53% | 2470 fps | 98.7% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 36,651 psi | 56% | 2490 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 47,630 psi | 73% | 2595 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 80% | 46,398 psi | 71% | 2605 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 54,679 psi | 84% | 2684 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,071 psi | 85% | 2641 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,064 psi | 71% | 2602 fps | 99.4% |
| Somchem S361 | <<locked>> | 80% | 48,718 psi | 75% | 2585 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 52,417 psi | 81% | 2654 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 46,876 psi | 72% | 2582 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 80% | 40,944 psi | 63% | 2467 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 49,139 psi | 76% | 2628 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 80% | 46,180 psi | 71% | 2589 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,237 psi | 70% | 2635 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 37,594 psi | 58% | 2464 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 37,898 psi | 58% | 2510 fps | 95% |
| Vihtavuori N570 | 87 gr | 90% | 44,715 psi | 69% | 2677 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 39,784 psi | 61% | 2572 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,207 psi | 66% | 2520 fps | 99% |
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 60 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Lapua Subsonic. Hodgdon Retumbo delivers the highest muzzle velocity at 2,907 fps; across all powders the maximum-charge window runs from 1,765 fps to 2,907 fps. ADI AR 2218 gives the best case fill at 100 %, and 60 of the 60 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | Lapua Subsonic 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.