Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 180gr | Sierra Pro-Hunter bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 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>> | 90% | 58,450 psi | 90% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,798 psi | 90% | 2874 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 58,436 psi | 90% | 2956 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 86% | 55,883 psi | 86% | 2884 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 58,247 psi | 90% | 2949 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 56,681 psi | 87% | 2920 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 53,374 psi | 82% | 2953 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 55,347 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 55,956 psi | 86% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 55,593 psi | 86% | 2874 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 58,595 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 56,362 psi | 87% | 2854 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 56,695 psi | 87% | 2920 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 57,276 psi | 88% | 2940 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 54,839 psi | 84% | 2940 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 55,230 psi | 85% | 2851 fps | 97.6% |
| Bofors RP15 | <<locked>> | 92% | 57,754 psi | 89% | 2930 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 56,463 psi | 87% | 2930 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 58,595 psi | 90% | 2946 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 58,320 psi | 90% | 2943 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 57,406 psi | 88% | 2884 fps | 99.3% |
| Hodgdon H4831 SC | <<locked>> | 88% | 56,202 psi | 86% | 2867 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 56,202 psi | 86% | 2799 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 55,651 psi | 86% | 3002 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 58% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 58,276 psi | 90% | 2861 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 55,288 psi | 85% | 2815 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,653 psi | 89% | 2864 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 90% | 56,420 psi | 87% | 2933 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 50,705 psi | 78% | 2854 fps | 99.3% |
| Lovex S065 | <<locked>> | 82% | 58,436 psi | 90% | 2838 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 56,782 psi | 87% | 2838 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 56,434 psi | 87% | 2822 fps | 100% |
| Norma 204 | <<locked>> | 82% | 55,883 psi | 86% | 2861 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 51,576 psi | 79% | 2877 fps | 100% |
| Norma MRP | <<locked>> | 88% | 58,798 psi | 90% | 2963 fps | 100% |
| Norma URP | <<locked>> | 82% | 56,724 psi | 87% | 2854 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 57,827 psi | 89% | 2953 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 55,883 psi | 86% | 2861 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 56,304 psi | 87% | 2881 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,537 psi | 59% | 1909 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 57,754 psi | 89% | 2920 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 56,695 psi | 87% | 2989 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 56,217 psi | 87% | 2949 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 86% | 56,579 psi | 87% | 2854 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 55,158 psi | 85% | 2864 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,436 psi | 90% | 2838 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 56,782 psi | 87% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,464 psi | 88% | 2795 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 58,523 psi | 90% | 2913 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 58,204 psi | 90% | 2841 fps | 99.4% |
| Somchem S365 | <<locked>> | 84% | 58,276 psi | 90% | 2854 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 55,709 psi | 86% | 2835 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 58,349 psi | 90% | 2844 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 55,535 psi | 85% | 2818 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 58,740 psi | 90% | 2884 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 82% | 57,580 psi | 89% | 2848 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 58,320 psi | 90% | 2884 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 58,218 psi | 90% | 2963 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 55,187 psi | 85% | 2890 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 96% | 56,724 psi | 87% | 2956 fps | 98.9% |
| Vihtavuori N570 | <<locked>> | 98% | 57,899 psi | 89% | 3012 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,957 psi | 89% | 2789 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 56,347 psi | 87% | 2940 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 55,434 psi | 85% | 2828 fps | 99.9% |
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% | 41,553 psi | 64% | 2585 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 54,752 psi | 84% | 2822 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 43,932 psi | 68% | 2710 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 45,556 psi | 70% | 2710 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 40,930 psi | 63% | 2651 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 37,463 psi | 58% | 2566 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 98% | 49,632 psi | 76% | 2884 fps | 96.1% |
| ADI AR 2225 | <<locked>> | 82% | 29,820 psi | 46% | 2411 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 52,301 psi | 80% | 2825 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,455 psi | 70% | 2703 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,611 psi | 64% | 2657 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,335 psi | 62% | 2608 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,780 psi | 54% | 2536 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,687 psi | 70% | 2762 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 47,021 psi | 72% | 2805 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 45,440 psi | 70% | 2677 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 38,682 psi | 60% | 2592 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 37,260 psi | 57% | 2582 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 41,611 psi | 64% | 2657 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 82% | 35,549 psi | 55% | 2523 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 43,511 psi | 67% | 2651 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,743 psi | 66% | 2638 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 49,211 psi | 76% | 2703 fps | 100% |
| Hodgdon Retumbo | 77.9 gr | 80% | 33,997 psi | 52% | 2562 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,152 psi | 43% | 1673 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 51,198 psi | 79% | 2756 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 51,634 psi | 79% | 2762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,614 psi | 69% | 2648 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 80% | 39,610 psi | 61% | 2631 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 90% | 35,752 psi | 55% | 2562 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 54,882 psi | 84% | 2789 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,301 psi | 82% | 2789 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,752 psi | 55% | 2464 fps | 98.5% |
| Norma 204 | <<locked>> | 80% | 52,170 psi | 80% | 2805 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 31,357 psi | 48% | 2467 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 44,092 psi | 68% | 2726 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 53,142 psi | 82% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,479 psi | 61% | 2638 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 80% | 52,228 psi | 80% | 2805 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,505 psi | 55% | 2516 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 44% | 1713 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 53,635 psi | 83% | 2864 fps | 100% |
| ReloadSwiss RS 76 | 83.3 gr | 80% | 33,257 psi | 51% | 2536 fps | 97.3% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 41,205 psi | 63% | 2687 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 46,557 psi | 72% | 2690 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 80% | 45,150 psi | 69% | 2697 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,882 psi | 84% | 2789 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,301 psi | 82% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,693 psi | 83% | 2740 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,817 psi | 69% | 2694 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 47,529 psi | 73% | 2674 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 50,778 psi | 78% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,600 psi | 70% | 2674 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 54,491 psi | 84% | 2792 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,668 psi | 61% | 2549 fps | 98.1% |
| Vihtavuori N170 | <<locked>> | 94% | 54,882 psi | 84% | 2828 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 53,896 psi | 83% | 2795 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,773 psi | 69% | 2680 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,845 psi | 67% | 2717 fps | 97% |
| Vihtavuori N565 | <<locked>> | 82% | 38,972 psi | 60% | 2595 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 88% | 42,395 psi | 65% | 2703 fps | 95.6% |
| Vihtavuori N570 | 95 gr | 94% | 50,053 psi | 77% | 2881 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 54,056 psi | 83% | 2743 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 38,174 psi | 59% | 2654 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,930 psi | 65% | 2602 fps | 98.1% |
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 | 180gr | Sierra Pro-Hunter. Vihtavuori N570 delivers the highest muzzle velocity at 3,012 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,012 fps. ADI AR 2218 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 180.0 gr projectile in 0.308" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Hodgdon TrailBoss 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, Vihtavuori N570, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 180gr | Sierra Pro-Hunter 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.