Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 200gr | Sako Hammerhead 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 ReloadSwiss RS 80.
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% | 57,000 psi | 88% | 2710 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 55,956 psi | 86% | 2808 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 86% | 58,175 psi | 90% | 2792 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,666 psi | 87% | 2808 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 55,550 psi | 85% | 2785 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,970 psi | 86% | 2890 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,334 psi | 90% | 2854 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 58,494 psi | 90% | 2789 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 58,494 psi | 90% | 2789 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,378 psi | 90% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,856 psi | 89% | 2782 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,116 psi | 88% | 2802 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 55,187 psi | 85% | 2713 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 55,535 psi | 85% | 2782 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,941 psi | 86% | 2795 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,754 psi | 89% | 2874 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,388 psi | 82% | 2799 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,246 psi | 88% | 2766 fps | 98.7% |
| Bofors RP15 | <<locked>> | 90% | 56,507 psi | 87% | 2792 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 55,477 psi | 85% | 2799 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,116 psi | 88% | 2802 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,956 psi | 88% | 2802 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 55,869 psi | 86% | 2743 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,494 psi | 90% | 2782 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,450 psi | 90% | 2700 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,566 psi | 90% | 2917 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,637 psi | 58% | 1768 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,695 psi | 87% | 2717 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,450 psi | 88% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 56,101 psi | 86% | 2723 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 55,143 psi | 85% | 2792 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,505 psi | 82% | 2782 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 55,201 psi | 85% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,059 psi | 89% | 2772 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,621 psi | 84% | 2805 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,392 psi | 88% | 2818 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,347 psi | 87% | 2812 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,059 psi | 89% | 2766 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 54,853 psi | 84% | 2743 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,740 psi | 60% | 1814 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,608 psi | 86% | 2851 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 54,795 psi | 84% | 2815 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 86% | 58,639 psi | 90% | 2762 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 57,464 psi | 88% | 2772 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,072 psi | 88% | 2769 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,434 psi | 87% | 2700 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 56,898 psi | 88% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,856 psi | 89% | 2743 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,841 psi | 89% | 2730 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,101 psi | 88% | 2753 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 86% | 57,174 psi | 88% | 2743 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,811 psi | 87% | 2822 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 57,696 psi | 89% | 2812 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 55,434 psi | 85% | 2822 fps | 99.3% |
| Vihtavuori N570 | <<locked>> | 96% | 56,782 psi | 87% | 2881 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 55,245 psi | 85% | 2795 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,798 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% | 45,324 psi | 70% | 2635 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 47,572 psi | 73% | 2635 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 42,786 psi | 66% | 2579 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 34,243 psi | 53% | 2392 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 94% | 44,817 psi | 69% | 2687 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 29,283 psi | 45% | 2303 fps | 96.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,921 psi | 74% | 2631 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 47,921 psi | 74% | 2631 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,694 psi | 84% | 2730 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,471 psi | 73% | 2625 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,540 psi | 67% | 2582 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,380 psi | 65% | 2526 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,622 psi | 56% | 2470 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,196 psi | 74% | 2684 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 42,714 psi | 66% | 2618 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,788 psi | 70% | 2667 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,222 psi | 68% | 2549 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 40,582 psi | 62% | 2526 fps | 98.5% |
| Bofors RP30 | <<locked>> | 80% | 34,156 psi | 53% | 2405 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 43,540 psi | 67% | 2582 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 34,766 psi | 54% | 2408 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 80% | 45,382 psi | 70% | 2575 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,556 psi | 69% | 2562 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,401 psi | 79% | 2608 fps | 100% |
| Hodgdon Retumbo | 75.5 gr | 80% | 35,752 psi | 55% | 2510 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,282 psi | 44% | 1585 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,171 psi | 82% | 2667 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,795 psi | 83% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,369 psi | 71% | 2569 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 41,510 psi | 64% | 2559 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 86% | 32,982 psi | 51% | 2395 fps | 95.1% |
| Lovex S071 | <<locked>> | 80% | 37,507 psi | 58% | 2395 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 54,302 psi | 84% | 2717 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 28,863 psi | 44% | 2303 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 46,383 psi | 71% | 2651 fps | 99.9% |
| Ramshot Grand | <<locked>> | 80% | 41,640 psi | 64% | 2572 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 80% | 54,404 psi | 84% | 2717 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,623 psi | 58% | 2457 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,051 psi | 45% | 1624 fps | 100% |
| ReloadSwiss RS 76 | 80.8 gr | 80% | 35,056 psi | 54% | 2484 fps | 98.9% |
| ReloadSwiss RS 80 | 85.6 gr | 84% | 37,463 psi | 58% | 2503 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 48,399 psi | 74% | 2608 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 47,036 psi | 72% | 2615 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,688 psi | 72% | 2612 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 49,371 psi | 76% | 2595 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 53,171 psi | 82% | 2661 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,485 psi | 73% | 2589 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,524 psi | 64% | 2477 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 49,893 psi | 77% | 2638 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 80% | 46,876 psi | 72% | 2598 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,021 psi | 71% | 2648 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 38,305 psi | 59% | 2477 fps | 96.6% |
| Vihtavuori N568 | <<locked>> | 84% | 38,580 psi | 59% | 2520 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 90% | 45,600 psi | 70% | 2694 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,698 psi | 63% | 2582 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,787 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 57 powders for .300 Rem. Ultra Mag. loaded with the .308 | 200gr | Sako Hammerhead. 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. 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 200.0 gr projectile in 0.308" calls for a 1:14.0 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, ReloadSwiss RS 80 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 200gr | Sako Hammerhead 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.