Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 210gr | Berger LRBTHP bullet and 57 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Vihtavuori N570.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 57,101 psi | 88% | 2651 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,043 psi | 86% | 2756 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 86% | 58,378 psi | 90% | 2736 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,840 psi | 87% | 2749 fps | 100% |
| ADI AR 2217 | <<locked>> | 96% | 55,405 psi | 85% | 2726 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,811 psi | 86% | 2838 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,218 psi | 90% | 2795 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 58,479 psi | 90% | 2730 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,436 psi | 90% | 2713 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,841 psi | 89% | 2723 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,290 psi | 88% | 2746 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,419 psi | 85% | 2657 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,637 psi | 86% | 2723 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,956 psi | 86% | 2740 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,609 psi | 89% | 2818 fps | 98.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,113 psi | 82% | 2746 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,290 psi | 88% | 2713 fps | 98.9% |
| Bofors RP15 | <<locked>> | 90% | 56,478 psi | 87% | 2733 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,506 psi | 85% | 2743 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,290 psi | 88% | 2746 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,014 psi | 88% | 2746 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,738 psi | 86% | 2684 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,610 psi | 90% | 2726 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,624 psi | 90% | 2641 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,639 psi | 90% | 2858 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,666 psi | 58% | 1719 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,652 psi | 87% | 2654 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,609 psi | 89% | 2657 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,246 psi | 87% | 2667 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 88% | 55,259 psi | 85% | 2736 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 94% | 58,334 psi | 90% | 2664 fps | 96.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,316 psi | 82% | 2726 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 55,245 psi | 85% | 2628 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,160 psi | 90% | 2713 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,491 psi | 84% | 2749 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,421 psi | 88% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,434 psi | 87% | 2753 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,189 psi | 90% | 2707 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,940 psi | 85% | 2687 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,653 psi | 59% | 1762 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,448 psi | 85% | 2792 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,810 psi | 84% | 2762 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 86% | 58,798 psi | 90% | 2707 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 57,638 psi | 89% | 2717 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,246 psi | 88% | 2713 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,391 psi | 87% | 2644 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 56,869 psi | 88% | 2648 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,885 psi | 89% | 2684 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,856 psi | 89% | 2671 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,130 psi | 88% | 2697 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 86% | 57,290 psi | 88% | 2684 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,797 psi | 87% | 2762 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 92% | 57,696 psi | 89% | 2756 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 55,317 psi | 85% | 2766 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 96% | 56,710 psi | 87% | 2825 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,347 psi | 85% | 2740 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,798 psi | 89% | 2684 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% | 43,598 psi | 67% | 2457 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,310 psi | 70% | 2579 fps | 98% |
| ADI AR 2209 | <<locked>> | 80% | 47,616 psi | 73% | 2575 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 42,873 psi | 66% | 2526 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 31,966 psi | 49% | 2290 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 94% | 44,759 psi | 69% | 2641 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 29,341 psi | 45% | 2264 fps | 97.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,964 psi | 74% | 2575 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,679 psi | 84% | 2667 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,514 psi | 73% | 2572 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,656 psi | 67% | 2533 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,380 psi | 65% | 2470 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,680 psi | 56% | 2421 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,211 psi | 74% | 2631 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 42,728 psi | 66% | 2572 fps | 95.6% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,716 psi | 70% | 2621 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 41,539 psi | 64% | 2448 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 40,596 psi | 62% | 2474 fps | 98.7% |
| Bofors RP30 | <<locked>> | 80% | 34,214 psi | 53% | 2362 fps | 96.3% |
| Bofors RP5 | <<locked>> | 80% | 43,656 psi | 67% | 2533 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 80% | 34,737 psi | 53% | 2359 fps | 97% |
| Hodgdon H4831 | <<locked>> | 80% | 45,484 psi | 70% | 2526 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,672 psi | 69% | 2510 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,532 psi | 79% | 2552 fps | 100% |
| Hodgdon Retumbo | 73.1 gr | 80% | 35,839 psi | 55% | 2464 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 44% | 1542 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,185 psi | 82% | 2608 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,027 psi | 83% | 2612 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,383 psi | 71% | 2516 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 41,597 psi | 64% | 2513 fps | 98.2% |
| IMR 7977 Enduron | <<locked>> | 92% | 54,723 psi | 84% | 2615 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,040 psi | 51% | 2352 fps | 95.7% |
| Lovex S071 | <<locked>> | 80% | 37,652 psi | 58% | 2349 fps | 99.6% |
| Norma 204 | <<locked>> | 80% | 54,302 psi | 84% | 2661 fps | 100% |
| Norma 217 | <<locked>> | 80% | 27,021 psi | 42% | 2208 fps | 95% |
| Norma MRP | <<locked>> | 80% | 46,441 psi | 71% | 2598 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,843 psi | 64% | 2523 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 80% | 54,418 psi | 84% | 2657 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,695 psi | 58% | 2411 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 45% | 1578 fps | 100% |
| ReloadSwiss RS 76 | 78.3 gr | 80% | 35,201 psi | 54% | 2441 fps | 99.2% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,362 psi | 57% | 2457 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 48,428 psi | 75% | 2552 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 47,239 psi | 73% | 2562 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,920 psi | 72% | 2559 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 49,487 psi | 76% | 2543 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 53,200 psi | 82% | 2605 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,601 psi | 73% | 2536 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,597 psi | 64% | 2428 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 88% | 46,630 psi | 72% | 2536 fps | 95% |
| Vihtavuori N555 | <<locked>> | 80% | 47,050 psi | 72% | 2543 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,093 psi | 71% | 2595 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 80% | 38,334 psi | 59% | 2431 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 38,667 psi | 60% | 2474 fps | 95.8% |
| Vihtavuori N570 | 83.5 gr | 88% | 42,424 psi | 65% | 2582 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,741 psi | 63% | 2530 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,932 psi | 68% | 2477 fps | 99.3% |
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 57 powders for .300 Rem. Ultra Mag. loaded with the .308 | 210gr | Berger LRBTHP. Hodgdon Retumbo delivers the highest muzzle velocity at 2,858 fps; across all powders the maximum-charge window runs from 1,719 fps to 2,858 fps. ADI AR 2218 gives the best case fill at 100 %, and 57 of the 57 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 210.0 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. Hodgdon Retumbo, ReloadSwiss RS 76, Vihtavuori N570 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 210gr | Berger LRBTHP 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.