Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Impala LWH CHP bullet and 70 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 Norma MRP.
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% | 57,885 psi | 89% | 3035 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,305 psi | 90% | 3074 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,941 psi | 86% | 3117 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 90% | 58,218 psi | 90% | 3114 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 56,318 psi | 87% | 3114 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,752 psi | 84% | 3071 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,763 psi | 77% | 3038 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 58,204 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,943 psi | 89% | 3100 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,898 psi | 88% | 3117 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 58,233 psi | 90% | 3091 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,870 psi | 89% | 3150 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,201 psi | 85% | 3123 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,740 psi | 89% | 3061 fps | 96.2% |
| Bofors RP15 | <<locked>> | 94% | 56,072 psi | 86% | 3104 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 58,073 psi | 89% | 3146 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 56,898 psi | 88% | 3117 fps | 99.3% |
| Bofors RP7 | <<locked>> | 82% | 55,883 psi | 86% | 3012 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 98% | 56,347 psi | 87% | 3097 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 82% | 55,317 psi | 85% | 3058 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 82% | 57,377 psi | 88% | 3068 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 90% | 56,188 psi | 86% | 3051 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,755 psi | 90% | 3091 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,071 psi | 85% | 2989 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,826 psi | 87% | 3222 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 55,854 psi | 86% | 3084 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 57% | 2008 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,334 psi | 88% | 3041 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,826 psi | 87% | 3028 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 58,233 psi | 90% | 3058 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,768 psi | 87% | 3035 fps | 98% |
| IMR 7828 SSC | <<locked>> | 94% | 58,334 psi | 90% | 3153 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,411 psi | 70% | 2946 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 58,189 psi | 90% | 3031 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,536 psi | 87% | 3028 fps | 99.9% |
| Lovex S071 | <<locked>> | 96% | 55,535 psi | 85% | 3002 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,610 psi | 90% | 3094 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 45,832 psi | 71% | 2976 fps | 98.8% |
| Norma MRP | <<locked>> | 90% | 57,029 psi | 88% | 3143 fps | 99.9% |
| Norma URP | <<locked>> | 84% | 55,883 psi | 86% | 3045 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,274 psi | 85% | 3110 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 86% | 58,436 psi | 90% | 3100 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 58,421 psi | 90% | 3104 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,232 psi | 59% | 2054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,088 psi | 89% | 3084 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,057 psi | 86% | 3107 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 58,233 psi | 90% | 3215 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,957 psi | 89% | 3169 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 88% | 55,622 psi | 86% | 3025 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 90% | 57,653 psi | 89% | 3094 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 82% | 55,883 psi | 86% | 3012 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,189 psi | 90% | 3031 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,536 psi | 87% | 3028 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,421 psi | 88% | 2982 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,217 psi | 88% | 3087 fps | 99.3% |
| Somchem S361 | <<locked>> | 88% | 57,493 psi | 88% | 3009 fps | 98% |
| Somchem S365 | <<locked>> | 86% | 56,826 psi | 87% | 3051 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,494 psi | 90% | 3068 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 58,001 psi | 89% | 2976 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,508 psi | 89% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,059 psi | 89% | 3041 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 56,971 psi | 88% | 3041 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,232 psi | 88% | 3074 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,478 psi | 87% | 3130 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 96% | 57,406 psi | 88% | 3114 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 58,291 psi | 90% | 3169 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,014 psi | 88% | 2979 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,506 psi | 85% | 3061 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,159 psi | 88% | 3176 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,392 psi | 90% | 3058 fps | 99.4% |
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% | 39,262 psi | 60% | 2713 fps | 98% |
| Accurate 4350 | <<locked>> | 80% | 51,126 psi | 79% | 2966 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 48,675 psi | 75% | 2989 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 42,032 psi | 65% | 2822 fps | 96.2% |
| ADI AR 2213 | <<locked>> | 84% | 43,279 psi | 67% | 2871 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 92% | 42,105 psi | 65% | 2828 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 88% | 33,968 psi | 52% | 2677 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,805 psi | 74% | 2959 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,221 psi | 65% | 2818 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,348 psi | 59% | 2762 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,159 psi | 57% | 2733 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,489 psi | 50% | 2641 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,220 psi | 63% | 2877 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 54,302 psi | 84% | 3002 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 40,727 psi | 63% | 2815 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 41,771 psi | 64% | 2858 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 38,348 psi | 59% | 2762 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 52,446 psi | 81% | 2953 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 88% | 40,335 psi | 62% | 2792 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 51,895 psi | 80% | 3002 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 53,838 psi | 83% | 3012 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 46,050 psi | 71% | 2874 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 84% | 45,252 psi | 70% | 2858 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,542 psi | 70% | 2841 fps | 100% |
| Hodgdon Retumbo | 81.9 gr | 86% | 38,363 psi | 59% | 2838 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 51,967 psi | 80% | 3022 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,050 psi | 43% | 1808 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,732 psi | 73% | 2881 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,417 psi | 82% | 2976 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 48,138 psi | 74% | 2900 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 44,454 psi | 68% | 2812 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 86% | 44,527 psi | 69% | 2907 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 98% | 42,482 psi | 65% | 2884 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 51,590 psi | 79% | 2933 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 50,067 psi | 77% | 2923 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 34,142 psi | 53% | 2592 fps | 96.3% |
| Norma 204 | <<locked>> | 80% | 48,196 psi | 74% | 2920 fps | 97.6% |
| Norma 217 | <<locked>> | 92% | 35,288 psi | 54% | 2736 fps | 95.2% |
| Norma MRP | 79.1 gr | 80% | 40,364 psi | 62% | 2835 fps | 97.3% |
| Norma URP | <<locked>> | 80% | 49,298 psi | 76% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,771 psi | 64% | 2854 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 48,225 psi | 74% | 2936 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 37,855 psi | 58% | 2736 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 44% | 1850 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,792 psi | 78% | 2976 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,544 psi | 75% | 2989 fps | 100% |
| ReloadSwiss RS 76 | 85.6 gr | 84% | 35,534 psi | 55% | 2753 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 46,296 psi | 71% | 2966 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 43,236 psi | 67% | 2799 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 41,713 psi | 64% | 2808 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 80% | 52,446 psi | 81% | 2953 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,590 psi | 79% | 2933 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 50,067 psi | 77% | 2923 fps | 99.3% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,662 psi | 78% | 2874 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,394 psi | 64% | 2802 fps | 96.1% |
| Somchem S361 | <<locked>> | 82% | 47,471 psi | 73% | 2838 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 46,717 psi | 72% | 2900 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,569 psi | 66% | 2789 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 80% | 54,621 psi | 84% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,647 psi | 78% | 2933 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,072 psi | 57% | 2657 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 50,212 psi | 77% | 2936 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,669 psi | 64% | 2815 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 46,035 psi | 71% | 2943 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 88% | 44,063 psi | 68% | 2874 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 94% | 47,239 psi | 73% | 2976 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,922 psi | 77% | 2881 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,083 psi | 80% | 3005 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,634 psi | 52% | 2766 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,943 psi | 60% | 2707 fps | 95.2% |
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 76 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Impala LWH CHP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,222 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,222 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 150.0 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 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, Norma MRP rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Impala LWH CHP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, Alliant Reloder-50 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.