Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Speer Soft Point bullet and 72 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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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>> | 92% | 55,753 psi | 86% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,115 psi | 86% | 3054 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,494 psi | 90% | 3163 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 57,203 psi | 88% | 3107 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 92% | 55,230 psi | 85% | 3107 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,606 psi | 83% | 3061 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,254 psi | 74% | 3018 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,043 psi | 88% | 3114 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,407 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,768 psi | 87% | 3094 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,521 psi | 85% | 3100 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,956 psi | 88% | 3081 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,826 psi | 87% | 3136 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,986 psi | 89% | 3166 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,913 psi | 88% | 3058 fps | 96.3% |
| Bofors RP15 | <<locked>> | 96% | 58,392 psi | 90% | 3143 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,782 psi | 87% | 3136 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 55,521 psi | 85% | 3100 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 57,914 psi | 89% | 3054 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 55,303 psi | 85% | 3094 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 57,812 psi | 89% | 3107 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,217 psi | 87% | 3061 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 90% | 54,926 psi | 85% | 3041 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,667 psi | 89% | 3084 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,276 psi | 88% | 3028 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,782 psi | 86% | 3209 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,781 psi | 84% | 3074 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 57% | 2021 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,260 psi | 87% | 3035 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,651 psi | 86% | 3022 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 56,449 psi | 87% | 3041 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,738 psi | 86% | 3028 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 94% | 57,203 psi | 88% | 3146 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,700 psi | 67% | 2917 fps | 96.3% |
| Lovex S065 | <<locked>> | 84% | 56,478 psi | 87% | 3022 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,595 psi | 90% | 3071 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,913 psi | 88% | 3031 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,551 psi | 89% | 3091 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 43,976 psi | 68% | 2943 fps | 98.5% |
| Norma MRP | <<locked>> | 90% | 55,521 psi | 85% | 3123 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 58,233 psi | 90% | 3091 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,378 psi | 90% | 3166 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 57,217 psi | 88% | 3091 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,276 psi | 88% | 3097 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,884 psi | 58% | 2064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,507 psi | 87% | 3074 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,882 psi | 84% | 3100 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,072 psi | 88% | 3202 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,637 psi | 87% | 3153 fps | 98.1% |
| Rottweil R 904 | <<locked>> | 90% | 58,233 psi | 90% | 3077 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 56,275 psi | 87% | 3084 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 57,914 psi | 89% | 3054 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,478 psi | 87% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,595 psi | 90% | 3071 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,581 psi | 90% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,825 psi | 86% | 2972 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,840 psi | 86% | 3077 fps | 99.3% |
| Somchem S361 | <<locked>> | 88% | 56,362 psi | 87% | 3005 fps | 98% |
| Somchem S365 | <<locked>> | 86% | 55,259 psi | 85% | 3038 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,014 psi | 88% | 3054 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 56,594 psi | 87% | 2966 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,101 psi | 86% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,666 psi | 87% | 3031 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,492 psi | 85% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,303 psi | 85% | 3058 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,158 psi | 85% | 3117 fps | 98% |
| Vihtavuori N565 | <<locked>> | 96% | 55,680 psi | 86% | 3094 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,101 psi | 88% | 3153 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,999 psi | 86% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,001 psi | 89% | 3110 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,796 psi | 86% | 3159 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,043 psi | 88% | 3048 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% | 36,622 psi | 56% | 2667 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 48,776 psi | 75% | 2940 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 47,021 psi | 72% | 2963 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 40,582 psi | 62% | 2802 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 44,744 psi | 69% | 2913 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 94% | 43,453 psi | 67% | 2867 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 90% | 34,330 psi | 53% | 2697 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,586 psi | 72% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,230 psi | 83% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,625 psi | 63% | 2795 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 39,146 psi | 60% | 2789 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,099 psi | 54% | 2694 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,530 psi | 47% | 2592 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,218 psi | 60% | 2838 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,330 psi | 82% | 2999 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 38,943 psi | 60% | 2782 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 42,888 psi | 66% | 2887 fps | 96.1% |
| Bofors RP5 | <<locked>> | 82% | 39,146 psi | 60% | 2789 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,966 psi | 78% | 2943 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 41,553 psi | 64% | 2835 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 50,473 psi | 78% | 2989 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 52,736 psi | 81% | 3005 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 84% | 44,628 psi | 69% | 2854 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,905 psi | 72% | 2900 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,932 psi | 68% | 2822 fps | 100% |
| Hodgdon Retumbo | 84.6 gr | 86% | 36,550 psi | 56% | 2802 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 50,691 psi | 78% | 3009 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 43% | 1818 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,354 psi | 71% | 2867 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,272 psi | 80% | 2969 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,238 psi | 71% | 2881 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,963 psi | 71% | 2854 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 86% | 43,004 psi | 66% | 2887 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,611 psi | 63% | 2848 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 49,821 psi | 77% | 2913 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,283 psi | 74% | 2904 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 31,444 psi | 48% | 2536 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 46,789 psi | 72% | 2907 fps | 97.5% |
| Norma 217 | <<locked>> | 94% | 35,520 psi | 55% | 2746 fps | 95.5% |
| Norma MRP | 81.7 gr | 80% | 38,435 psi | 59% | 2799 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 47,674 psi | 73% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 43,091 psi | 66% | 2894 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 46,717 psi | 72% | 2917 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 35,940 psi | 55% | 2697 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,369 psi | 44% | 1860 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,066 psi | 76% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,210 psi | 73% | 2972 fps | 99.9% |
| ReloadSwiss RS 76 | 88.5 gr | 84% | 33,620 psi | 52% | 2703 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,512 psi | 69% | 2933 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 41,785 psi | 64% | 2779 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 39,914 psi | 61% | 2779 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,966 psi | 78% | 2943 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,821 psi | 77% | 2913 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,283 psi | 74% | 2904 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,129 psi | 85% | 2877 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,878 psi | 75% | 2861 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,624 psi | 61% | 2772 fps | 95.7% |
| Somchem S361 | <<locked>> | 82% | 45,861 psi | 71% | 2822 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 44,860 psi | 69% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,654 psi | 63% | 2762 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 53,055 psi | 82% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,066 psi | 76% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,753 psi | 58% | 2687 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 48,515 psi | 75% | 2917 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,407 psi | 61% | 2779 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 44,527 psi | 69% | 2920 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 90% | 45,165 psi | 70% | 2907 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 96% | 49,197 psi | 76% | 3018 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,617 psi | 75% | 2871 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,473 psi | 78% | 2989 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,604 psi | 49% | 2710 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,958 psi | 61% | 2743 fps | 95.8% |
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 77 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Speer Soft Point. Hodgdon Retumbo delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,209 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 1:16.0 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 | Speer Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 Enduron 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.