Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 185gr | RWS Evolution bullet and 69 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 57,290 psi | 88% | 2799 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,580 psi | 89% | 2825 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,173 psi | 86% | 2897 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 58,697 psi | 90% | 2887 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,913 psi | 88% | 2900 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 55,405 psi | 85% | 2867 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,112 psi | 80% | 2904 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,998 psi | 83% | 2890 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 55,158 psi | 85% | 2831 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,769 psi | 90% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,276 psi | 90% | 2877 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,305 psi | 88% | 2894 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 55,288 psi | 85% | 2808 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 55,361 psi | 85% | 2874 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 55,883 psi | 86% | 2890 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,551 psi | 89% | 2956 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,827 psi | 89% | 2858 fps | 98.1% |
| Bofors RP15 | <<locked>> | 92% | 56,681 psi | 87% | 2884 fps | 99.9% |
| Bofors RP30 | <<locked>> | 96% | 55,129 psi | 85% | 2881 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 57,305 psi | 88% | 2894 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,682 psi | 90% | 2822 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,072 psi | 88% | 2894 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 56,304 psi | 87% | 2835 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 88% | 55,288 psi | 85% | 2822 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 55,274 psi | 85% | 2753 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,160 psi | 90% | 3009 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 58% | 1831 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,348 psi | 88% | 2812 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,943 psi | 89% | 2815 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,739 psi | 87% | 2815 fps | 99.4% |
| IMR 7828 SSC | <<locked>> | 90% | 55,216 psi | 85% | 2881 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,284 psi | 76% | 2805 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 57,522 psi | 89% | 2792 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,941 psi | 86% | 2792 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 55,245 psi | 85% | 2776 fps | 100% |
| Norma 204 | <<locked>> | 82% | 54,781 psi | 84% | 2812 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 50,285 psi | 77% | 2831 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,435 psi | 88% | 2910 fps | 100% |
| Norma URP | <<locked>> | 82% | 55,796 psi | 86% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,463 psi | 87% | 2904 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 58,682 psi | 90% | 2864 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 54,984 psi | 85% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,406 psi | 59% | 1873 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,914 psi | 89% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,434 psi | 87% | 2871 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 55,288 psi | 85% | 2940 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 54,549 psi | 84% | 2897 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 86% | 55,680 psi | 86% | 2805 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 57,856 psi | 89% | 2867 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,682 psi | 90% | 2822 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,522 psi | 89% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,941 psi | 86% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,449 psi | 87% | 2746 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,450 psi | 88% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,130 psi | 88% | 2795 fps | 99.3% |
| Somchem S365 | <<locked>> | 84% | 57,145 psi | 88% | 2808 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,436 psi | 90% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,246 psi | 88% | 2795 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,218 psi | 90% | 2822 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,392 psi | 88% | 2835 fps | 96.4% |
| Vihtavuori N550 | <<locked>> | 82% | 56,623 psi | 87% | 2802 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,130 psi | 88% | 2835 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,898 psi | 88% | 2910 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 94% | 57,841 psi | 89% | 2900 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 96% | 55,143 psi | 85% | 2900 fps | 98.7% |
| Vihtavuori N570 | <<locked>> | 98% | 56,376 psi | 87% | 2959 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,029 psi | 88% | 2746 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 54,810 psi | 84% | 2890 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,276 psi | 90% | 2835 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% | 40,857 psi | 63% | 2543 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 53,911 psi | 83% | 2772 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,192 psi | 65% | 2654 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 44,802 psi | 69% | 2667 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 80% | 40,147 psi | 62% | 2605 fps | 96.5% |
| ADI AR 2217 | <<locked>> | 86% | 36,637 psi | 56% | 2520 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 98% | 48,356 psi | 74% | 2828 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 82% | 29,269 psi | 45% | 2369 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 45,208 psi | 70% | 2667 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,372 psi | 79% | 2776 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,788 psi | 69% | 2661 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,785 psi | 63% | 2612 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,537 psi | 61% | 2566 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,113 psi | 53% | 2493 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,556 psi | 69% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 45,687 psi | 70% | 2756 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,776 psi | 74% | 2690 fps | 95.9% |
| Bofors RP15 | <<locked>> | 80% | 37,971 psi | 58% | 2549 fps | 97% |
| Bofors RP30 | <<locked>> | 84% | 36,390 psi | 56% | 2536 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 40,785 psi | 63% | 2612 fps | 98% |
| Bofors RP7 | <<locked>> | 80% | 55,143 psi | 85% | 2772 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,795 psi | 54% | 2477 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 80% | 42,757 psi | 66% | 2608 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,974 psi | 65% | 2592 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,327 psi | 74% | 2657 fps | 100% |
| Hodgdon Retumbo | 75.2 gr | 80% | 33,301 psi | 51% | 2520 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,123 psi | 43% | 1640 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,531 psi | 78% | 2713 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 50,850 psi | 78% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,990 psi | 68% | 2605 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 80% | 38,812 psi | 60% | 2585 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 90% | 34,896 psi | 54% | 2516 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 54,128 psi | 83% | 2746 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,547 psi | 81% | 2743 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,085 psi | 54% | 2425 fps | 98.5% |
| Norma 204 | <<locked>> | 80% | 51,198 psi | 79% | 2756 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 30,589 psi | 47% | 2425 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 43,149 psi | 66% | 2680 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 52,315 psi | 81% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,696 psi | 60% | 2592 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 80% | 51,227 psi | 79% | 2759 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,722 psi | 53% | 2474 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,834 psi | 44% | 1680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,186 psi | 83% | 2795 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,634 psi | 81% | 2818 fps | 100% |
| ReloadSwiss RS 76 | 80.5 gr | 80% | 32,547 psi | 50% | 2490 fps | 97.1% |
| ReloadSwiss RS 80 | 89.2 gr | 88% | 40,016 psi | 62% | 2638 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 45,716 psi | 70% | 2644 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 44,237 psi | 68% | 2651 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 80% | 55,143 psi | 85% | 2772 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,128 psi | 83% | 2746 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,547 psi | 81% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,881 psi | 81% | 2697 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,888 psi | 68% | 2644 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 46,818 psi | 72% | 2631 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 49,951 psi | 77% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,788 psi | 69% | 2628 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 53,751 psi | 83% | 2749 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,030 psi | 60% | 2507 fps | 98% |
| Vihtavuori N170 | <<locked>> | 94% | 53,679 psi | 83% | 2779 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 53,055 psi | 82% | 2753 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,918 psi | 68% | 2638 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,946 psi | 66% | 2671 fps | 96.9% |
| Vihtavuori N565 | <<locked>> | 82% | 38,145 psi | 59% | 2552 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 88% | 41,321 psi | 64% | 2657 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 94% | 48,689 psi | 75% | 2831 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,214 psi | 82% | 2697 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,985 psi | 57% | 2608 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,205 psi | 63% | 2559 fps | 98% |
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 69 powders for .300 Rem. Ultra Mag. loaded with the .308 | 185gr | RWS Evolution. Hodgdon Retumbo delivers the highest muzzle velocity at 3,009 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,009 fps. ADI AR 2218 gives the best case fill at 100 %, and 69 of the 69 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 185.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-33 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 | 185gr | RWS Evolution 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.