Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 167gr | MRR Green Hunting bullet and 73 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 N560.
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>> | 92% | 55,216 psi | 85% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,854 psi | 86% | 2927 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,392 psi | 90% | 3048 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 90% | 57,377 psi | 88% | 2989 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 55,288 psi | 85% | 2992 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,461 psi | 82% | 2949 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,051 psi | 74% | 2910 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,435 psi | 88% | 2986 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,203 psi | 88% | 2989 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,436 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,724 psi | 87% | 2976 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,434 psi | 85% | 2986 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,782 psi | 87% | 2956 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,840 psi | 87% | 3018 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,769 psi | 89% | 3041 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,811 psi | 87% | 2946 fps | 97% |
| Bofors RP15 | <<locked>> | 96% | 58,320 psi | 90% | 3028 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,391 psi | 87% | 3015 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 55,434 psi | 85% | 2986 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 57,899 psi | 89% | 2933 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 55,201 psi | 85% | 2979 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 57,841 psi | 89% | 2986 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,405 psi | 87% | 2943 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 54,984 psi | 85% | 2930 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,682 psi | 89% | 2969 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,406 psi | 88% | 2907 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,666 psi | 86% | 3094 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,737 psi | 84% | 2959 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,130 psi | 57% | 1913 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,202 psi | 86% | 2913 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,680 psi | 86% | 2900 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 56,478 psi | 87% | 2920 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,811 psi | 86% | 2917 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 94% | 57,203 psi | 88% | 3031 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,250 psi | 67% | 2805 fps | 97% |
| Lovex S065 | <<locked>> | 84% | 56,405 psi | 87% | 2897 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,349 psi | 90% | 2946 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,507 psi | 87% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,624 psi | 89% | 2972 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 43,555 psi | 67% | 2831 fps | 99% |
| Norma MRP | <<locked>> | 90% | 55,506 psi | 85% | 3005 fps | 100% |
| Norma URP | <<locked>> | 86% | 58,102 psi | 89% | 2963 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,436 psi | 90% | 3051 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 86% | 57,217 psi | 88% | 2969 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,072 psi | 88% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,927 psi | 58% | 1955 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,362 psi | 87% | 2949 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,839 psi | 84% | 2976 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,826 psi | 87% | 3084 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,333 psi | 87% | 3038 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 90% | 58,102 psi | 89% | 2956 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 56,304 psi | 87% | 2966 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 57,899 psi | 89% | 2933 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,405 psi | 87% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,349 psi | 90% | 2946 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,668 psi | 90% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,680 psi | 86% | 2851 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,883 psi | 86% | 2959 fps | 99.6% |
| Somchem S361 | <<locked>> | 88% | 56,144 psi | 86% | 2890 fps | 98.5% |
| Somchem S365 | <<locked>> | 86% | 55,129 psi | 85% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,652 psi | 87% | 2933 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 56,449 psi | 87% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,072 psi | 86% | 2904 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,492 psi | 87% | 2913 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 55,317 psi | 85% | 2907 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,784 psi | 90% | 2982 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,201 psi | 85% | 3002 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 96% | 55,303 psi | 85% | 2979 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,768 psi | 87% | 3038 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,985 psi | 86% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,841 psi | 89% | 2986 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,753 psi | 86% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,826 psi | 87% | 2930 fps | 99.7% |
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% | 36,114 psi | 56% | 2552 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 48,530 psi | 75% | 2815 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 43,540 psi | 67% | 2789 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 40,480 psi | 62% | 2694 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 41,626 psi | 64% | 2743 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 40,248 psi | 62% | 2700 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 88% | 31,647 psi | 49% | 2530 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,901 psi | 63% | 2694 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,514 psi | 72% | 2825 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,259 psi | 84% | 2940 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,524 psi | 62% | 2687 fps | 96.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,303 psi | 56% | 2621 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,954 psi | 54% | 2589 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,182 psi | 46% | 2490 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,943 psi | 60% | 2730 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,024 psi | 77% | 2831 fps | 95.3% |
| Bofors RP15 | <<locked>> | 82% | 36,100 psi | 56% | 2615 fps | 95.1% |
| Bofors RP30 | <<locked>> | 90% | 39,523 psi | 61% | 2713 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 36,303 psi | 56% | 2621 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 50,778 psi | 78% | 2822 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 38,363 psi | 59% | 2661 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 50,285 psi | 77% | 2867 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 52,707 psi | 81% | 2884 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 41,437 psi | 64% | 2687 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,656 psi | 67% | 2730 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,671 psi | 67% | 2703 fps | 100% |
| Hodgdon Retumbo | 80.7 gr | 86% | 36,303 psi | 56% | 2697 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 50,676 psi | 78% | 2894 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,746 psi | 43% | 1716 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,311 psi | 71% | 2753 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,286 psi | 80% | 2848 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 46,050 psi | 71% | 2762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,844 psi | 66% | 2687 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 84% | 40,074 psi | 62% | 2717 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,306 psi | 62% | 2743 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 49,719 psi | 77% | 2795 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,066 psi | 74% | 2785 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 30,792 psi | 47% | 2425 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 46,630 psi | 72% | 2792 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 32,692 psi | 50% | 2579 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 38,189 psi | 59% | 2690 fps | 97.5% |
| Norma URP | <<locked>> | 80% | 47,543 psi | 73% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,740 psi | 61% | 2720 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 46,499 psi | 72% | 2802 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 84% | 35,621 psi | 55% | 2595 fps | 96.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,239 psi | 43% | 1755 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,704 psi | 75% | 2835 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,108 psi | 73% | 2854 fps | 100% |
| ReloadSwiss RS 76 | 84.4 gr | 84% | 33,185 psi | 51% | 2605 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,135 psi | 68% | 2828 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 41,626 psi | 64% | 2671 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 39,755 psi | 61% | 2671 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 80% | 50,778 psi | 78% | 2822 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,719 psi | 77% | 2795 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,066 psi | 74% | 2785 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,013 psi | 85% | 2753 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,602 psi | 75% | 2743 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,421 psi | 61% | 2664 fps | 96.5% |
| Somchem S361 | <<locked>> | 80% | 42,496 psi | 65% | 2654 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 44,730 psi | 69% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,292 psi | 62% | 2651 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 52,924 psi | 81% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,023 psi | 75% | 2799 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,925 psi | 54% | 2520 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 48,356 psi | 74% | 2802 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,972 psi | 60% | 2661 fps | 99.8% |
| Vihtavuori N560 | 79.9 gr | 82% | 41,263 psi | 64% | 2743 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 41,713 psi | 64% | 2733 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 94% | 45,237 psi | 70% | 2841 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,559 psi | 75% | 2753 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,459 psi | 78% | 2871 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,357 psi | 48% | 2602 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,956 psi | 57% | 2575 fps | 95.6% |
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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 167gr | MRR Green Hunting. Hodgdon Retumbo delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,094 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 167.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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 N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 167gr | MRR Green Hunting 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.