Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Speer Hot-Cor 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% | 56,971 psi | 88% | 2707 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,927 psi | 86% | 2808 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 86% | 58,175 psi | 90% | 2792 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,681 psi | 87% | 2805 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 55,332 psi | 85% | 2779 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 2887 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,102 psi | 89% | 2851 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,349 psi | 90% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,638 psi | 89% | 2779 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,130 psi | 88% | 2802 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,187 psi | 85% | 2713 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,506 psi | 85% | 2779 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,695 psi | 86% | 2792 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,537 psi | 89% | 2871 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,185 psi | 82% | 2795 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,072 psi | 88% | 2762 fps | 98.6% |
| Bofors RP15 | <<locked>> | 90% | 56,318 psi | 87% | 2789 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,259 psi | 85% | 2795 fps | 99.9% |
| Bofors RP5 | <<locked>> | 88% | 57,130 psi | 88% | 2802 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,942 psi | 88% | 2802 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,651 psi | 86% | 2743 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,465 psi | 90% | 2782 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,421 psi | 90% | 2697 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,581 psi | 90% | 2917 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,724 psi | 58% | 1768 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,492 psi | 87% | 2710 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,435 psi | 88% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,086 psi | 86% | 2723 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 54,911 psi | 85% | 2789 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,272 psi | 82% | 2782 fps | 99.9% |
| Lovex S070 | <<locked>> | 82% | 58,784 psi | 90% | 2740 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,668 psi | 90% | 2730 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,044 psi | 89% | 2772 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,404 psi | 84% | 2802 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,188 psi | 88% | 2815 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,144 psi | 86% | 2808 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,059 psi | 89% | 2766 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,665 psi | 84% | 2740 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,682 psi | 60% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,390 psi | 85% | 2848 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,810 psi | 84% | 2815 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 58,624 psi | 90% | 2762 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 57,464 psi | 88% | 2772 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 58,784 psi | 90% | 2740 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,072 psi | 88% | 2769 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,405 psi | 87% | 2700 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 56,695 psi | 87% | 2707 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,841 psi | 89% | 2743 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,856 psi | 89% | 2730 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,956 psi | 88% | 2749 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 86% | 56,956 psi | 88% | 2740 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,594 psi | 87% | 2818 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 57,667 psi | 89% | 2808 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 55,259 psi | 85% | 2818 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 96% | 56,550 psi | 87% | 2877 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,216 psi | 85% | 2795 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,783 psi | 89% | 2743 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% | 43,540 psi | 67% | 2510 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,165 psi | 70% | 2631 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 47,529 psi | 73% | 2631 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 42,772 psi | 66% | 2575 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 34,084 psi | 52% | 2388 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 94% | 44,672 psi | 69% | 2684 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 29,254 psi | 45% | 2303 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,491 psi | 84% | 2726 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,427 psi | 73% | 2625 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,526 psi | 67% | 2582 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,337 psi | 65% | 2526 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,593 psi | 56% | 2470 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,979 psi | 74% | 2684 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 42,525 psi | 65% | 2615 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,643 psi | 70% | 2667 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,106 psi | 68% | 2549 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 40,538 psi | 62% | 2523 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 34,127 psi | 53% | 2405 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 43,526 psi | 67% | 2582 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 34,621 psi | 53% | 2402 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 80% | 45,353 psi | 70% | 2575 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,527 psi | 69% | 2559 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,184 psi | 79% | 2605 fps | 100% |
| Hodgdon Retumbo | 75.4 gr | 80% | 35,723 psi | 55% | 2507 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,340 psi | 44% | 1588 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,156 psi | 82% | 2664 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,766 psi | 83% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,340 psi | 71% | 2566 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 41,481 psi | 64% | 2562 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 86% | 32,938 psi | 51% | 2392 fps | 95.1% |
| Lovex S070 | <<locked>> | 80% | 55,274 psi | 85% | 2690 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,449 psi | 58% | 2395 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 54,070 psi | 83% | 2717 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 28,848 psi | 44% | 2303 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 46,195 psi | 71% | 2648 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 41,597 psi | 64% | 2572 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 80% | 54,172 psi | 83% | 2713 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,420 psi | 58% | 2454 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,109 psi | 45% | 1624 fps | 100% |
| ReloadSwiss RS 76 | 80.7 gr | 80% | 35,056 psi | 54% | 2484 fps | 98.9% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,304 psi | 57% | 2500 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 48,225 psi | 74% | 2605 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 46,992 psi | 72% | 2615 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 55,274 psi | 85% | 2690 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,644 psi | 72% | 2612 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 49,356 psi | 76% | 2595 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 53,142 psi | 82% | 2661 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,456 psi | 73% | 2589 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,481 psi | 64% | 2477 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 49,705 psi | 76% | 2638 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 46,833 psi | 72% | 2595 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,847 psi | 71% | 2641 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 38,145 psi | 59% | 2474 fps | 96.5% |
| Vihtavuori N568 | <<locked>> | 84% | 38,537 psi | 59% | 2520 fps | 95.3% |
| Vihtavuori N570 | 88 gr | 90% | 45,440 psi | 70% | 2687 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,495 psi | 62% | 2579 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,772 psi | 67% | 2526 fps | 99.1% |
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 65 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Speer Hot-Cor. Hodgdon Retumbo delivers the highest muzzle velocity at 2,917 fps; across all powders the maximum-charge window runs from 1,768 fps to 2,917 fps. Accurate 8700 gives the best case fill at 100 %, and 65 of the 65 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 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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 | 200gr | Speer Hot-Cor they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Hodgdon US 869, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.