Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Barnes MRX BT bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC 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>> | 96% | 58,407 psi | 90% | 3054 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,361 psi | 85% | 3048 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,580 psi | 89% | 3153 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 82% | 56,333 psi | 87% | 3018 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,768 psi | 87% | 3100 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 96% | 58,769 psi | 90% | 3163 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,240 psi | 76% | 2982 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,859 psi | 68% | 2933 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,653 psi | 89% | 3041 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,463 psi | 87% | 3110 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 58,044 psi | 89% | 3123 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,289 psi | 87% | 3087 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 58,624 psi | 90% | 3153 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,883 psi | 86% | 3071 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,622 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,594 psi | 87% | 3156 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 57,522 psi | 89% | 3136 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,503 psi | 79% | 3054 fps | 98.1% |
| Bofors RP5 | <<locked>> | 96% | 58,624 psi | 90% | 3153 fps | 99.5% |
| Bofors RP7 | <<locked>> | 86% | 57,827 psi | 89% | 3051 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,534 psi | 84% | 3081 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 86% | 57,464 psi | 88% | 3104 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,289 psi | 87% | 3061 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 58,581 psi | 90% | 3100 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,290 psi | 88% | 3077 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,811 psi | 87% | 3028 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,433 psi | 84% | 3192 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 86% | 58,682 psi | 90% | 3140 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,695 psi | 56% | 1998 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,101 psi | 86% | 3031 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,840 psi | 86% | 3025 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 55,825 psi | 86% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,506 psi | 85% | 3022 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 96% | 56,376 psi | 87% | 3136 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 56,391 psi | 87% | 3022 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,233 psi | 90% | 3068 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,608 psi | 86% | 3018 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,537 psi | 89% | 3091 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 39,204 psi | 60% | 2848 fps | 96.8% |
| Norma MRP | <<locked>> | 94% | 58,798 psi | 90% | 3179 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 57,754 psi | 89% | 3087 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,551 psi | 89% | 3156 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 56,971 psi | 88% | 3091 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,144 psi | 86% | 3084 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,420 psi | 58% | 2044 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,392 psi | 88% | 3114 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,680 psi | 86% | 3068 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 58,523 psi | 90% | 3156 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,869 psi | 86% | 3192 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,604 psi | 78% | 3058 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 82% | 55,405 psi | 85% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,928 psi | 89% | 3071 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 92% | 55,782 psi | 86% | 3077 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 86% | 57,827 psi | 89% | 3051 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,391 psi | 87% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,233 psi | 90% | 3068 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,290 psi | 88% | 3061 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,245 psi | 85% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,811 psi | 86% | 2969 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,347 psi | 85% | 3071 fps | 99.1% |
| Somchem S355 | <<locked>> | 84% | 58,624 psi | 90% | 3048 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,072 psi | 86% | 2999 fps | 97.7% |
| Somchem S365 | <<locked>> | 90% | 58,407 psi | 90% | 3087 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,144 psi | 86% | 3045 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 56,521 psi | 87% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,796 psi | 86% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,956 psi | 86% | 3022 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 55,187 psi | 85% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 57,928 psi | 89% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 58,523 psi | 90% | 3169 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 58,436 psi | 90% | 3140 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,401 psi | 79% | 3064 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,782 psi | 86% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,667 psi | 89% | 3107 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 58,392 psi | 90% | 3205 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,637 psi | 87% | 3041 fps | 99.2% |
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% | 32,953 psi | 51% | 2582 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 44,599 psi | 69% | 2871 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 49,559 psi | 76% | 3015 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 52,852 psi | 81% | 2966 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,132 psi | 62% | 2792 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 88% | 44,251 psi | 68% | 2904 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 96% | 42,743 psi | 66% | 2851 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 94% | 35,650 psi | 55% | 2736 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,041 psi | 83% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,946 psi | 66% | 2884 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,067 psi | 77% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,089 psi | 62% | 2789 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 86% | 41,205 psi | 63% | 2841 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,763 psi | 49% | 2621 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,720 psi | 49% | 2631 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,983 psi | 54% | 2749 fps | 97.9% |
| Bofors RP15 | <<locked>> | 88% | 40,785 psi | 63% | 2828 fps | 95.6% |
| Bofors RP30 | <<locked>> | 94% | 41,379 psi | 64% | 2861 fps | 95.3% |
| Bofors RP5 | <<locked>> | 86% | 41,205 psi | 63% | 2841 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 47,500 psi | 73% | 2881 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 92% | 40,683 psi | 63% | 2812 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 46,688 psi | 72% | 2923 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 49,139 psi | 76% | 2943 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 47,340 psi | 73% | 2910 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,456 psi | 71% | 2894 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,364 psi | 62% | 2762 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,203 psi | 59% | 2848 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 46,499 psi | 72% | 2940 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,354 psi | 42% | 1795 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,091 psi | 66% | 2802 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,037 psi | 75% | 2910 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 42,482 psi | 65% | 2815 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,687 psi | 70% | 2848 fps | 95.3% |
| IMR 7828 SSC | 84.3 gr | 90% | 45,498 psi | 70% | 2940 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 46,456 psi | 71% | 2858 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 44,730 psi | 69% | 2838 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 32,300 psi | 50% | 2566 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 43,308 psi | 67% | 2838 fps | 96.2% |
| Norma 217 | <<locked>> | 98% | 36,405 psi | 56% | 2779 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 34,809 psi | 54% | 2720 fps | 95% |
| Norma URP | <<locked>> | 80% | 43,961 psi | 68% | 2861 fps | 99.6% |
| Ramshot Grand | <<locked>> | 88% | 42,221 psi | 65% | 2877 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 43,076 psi | 66% | 2851 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 37,724 psi | 58% | 2746 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,920 psi | 43% | 1837 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,330 psi | 82% | 3058 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,889 psi | 69% | 2887 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,337 psi | 67% | 2904 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,085 psi | 54% | 2753 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,702 psi | 72% | 2986 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 51,663 psi | 80% | 2949 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,266 psi | 68% | 2831 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 82% | 39,233 psi | 60% | 2769 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 47,500 psi | 73% | 2881 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,456 psi | 71% | 2858 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 44,730 psi | 69% | 2838 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,534 psi | 82% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,938 psi | 80% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,542 psi | 70% | 2799 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,914 psi | 60% | 2762 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 51,547 psi | 79% | 2946 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,600 psi | 70% | 2818 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 40,828 psi | 63% | 2812 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,086 psi | 57% | 2687 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 49,414 psi | 76% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,397 psi | 70% | 2858 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 36,869 psi | 57% | 2671 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 44,817 psi | 69% | 2858 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 35,621 psi | 55% | 2700 fps | 98.6% |
| Vihtavuori N560 | 85.6 gr | 88% | 46,949 psi | 72% | 2969 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 92% | 43,772 psi | 67% | 2884 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 47,732 psi | 73% | 2995 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,918 psi | 69% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,688 psi | 72% | 2923 fps | 98.7% |
| Winchester StaBALL HD | 77.1 gr | 80% | 28,224 psi | 43% | 2608 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,276 psi | 60% | 2730 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 82 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Barnes MRX BT. Winchester StaBALL HD delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 1,998 fps to 3,205 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Winchester StaBALL HD, IMR 7828 SSC, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, IMR 8133 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.