Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 155gr | Brenneke TAG bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Hodgdon Retumbo and IMR 7828 SSC.
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.
A valid access license is required to use the Personalized Load Calculator.
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>> | 94% | 57,580 psi | 89% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,189 psi | 90% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,666 psi | 87% | 3104 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 58,523 psi | 90% | 3015 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 55,782 psi | 86% | 3054 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 57,638 psi | 89% | 3114 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,040 psi | 80% | 3005 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,485 psi | 72% | 2956 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,550 psi | 85% | 3058 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,652 psi | 87% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,158 psi | 85% | 3038 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,653 psi | 89% | 3107 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,129 psi | 85% | 3025 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,027 psi | 85% | 3081 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,912 psi | 86% | 3107 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,564 psi | 86% | 3005 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 56,797 psi | 87% | 3091 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,737 psi | 84% | 3074 fps | 98.9% |
| Bofors RP5 | <<locked>> | 94% | 57,653 psi | 89% | 3107 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 56,405 psi | 87% | 2999 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,551 psi | 89% | 3094 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 56,159 psi | 86% | 3051 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 58,755 psi | 90% | 3068 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 57,363 psi | 88% | 3048 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,144 psi | 86% | 3028 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,782 psi | 86% | 2976 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,769 psi | 89% | 3212 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,261 psi | 88% | 3081 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,854 psi | 57% | 1982 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 58,639 psi | 90% | 3038 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,117 psi | 89% | 3025 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 58,668 psi | 90% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,102 psi | 89% | 3035 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 55,608 psi | 86% | 3091 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 58,798 psi | 90% | 3022 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,855 psi | 88% | 3012 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 58,653 psi | 90% | 3025 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,101 psi | 86% | 3038 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 41,887 psi | 64% | 2874 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 57,885 psi | 89% | 3127 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,521 psi | 87% | 3031 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,521 psi | 87% | 3107 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 55,709 psi | 86% | 3038 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,056 psi | 85% | 3031 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,753 psi | 58% | 2028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,766 psi | 84% | 3015 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,406 psi | 88% | 3100 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,027 psi | 85% | 3143 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,360 psi | 84% | 3087 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 82% | 57,870 psi | 89% | 2999 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,637 psi | 87% | 3018 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 58,624 psi | 90% | 3084 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 56,405 psi | 87% | 2999 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,798 psi | 90% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,855 psi | 88% | 3012 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,450 psi | 88% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,073 psi | 89% | 2969 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 58,175 psi | 90% | 3081 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 57,334 psi | 88% | 2995 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,581 psi | 90% | 3005 fps | 98.5% |
| Somchem S365 | <<locked>> | 88% | 57,450 psi | 88% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,230 psi | 85% | 2999 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 55,172 psi | 85% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,363 psi | 90% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,129 psi | 85% | 2976 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 57,624 psi | 89% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,985 psi | 88% | 3051 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,566 psi | 89% | 3123 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 98% | 57,638 psi | 89% | 3097 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,027 psi | 85% | 3094 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 58,581 psi | 90% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,405 psi | 87% | 3054 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,117 psi | 89% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,463 psi | 85% | 2992 fps | 99.3% |
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% | 34,896 psi | 54% | 2602 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 47,007 psi | 72% | 2877 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 45,310 psi | 70% | 2904 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 55,027 psi | 85% | 2966 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,247 psi | 60% | 2743 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 86% | 43,279 psi | 67% | 2854 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 42,003 psi | 65% | 2812 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 32,808 psi | 50% | 2631 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,107 psi | 69% | 2890 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,634 psi | 81% | 3009 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,276 psi | 60% | 2740 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,739 psi | 58% | 2730 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,721 psi | 52% | 2635 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,314 psi | 48% | 2592 fps | 96.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,376 psi | 58% | 2772 fps | 98.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,098 psi | 80% | 2946 fps | 95.2% |
| Bofors RP15 | <<locked>> | 86% | 40,161 psi | 62% | 2785 fps | 96% |
| Bofors RP30 | <<locked>> | 92% | 41,089 psi | 63% | 2822 fps | 95.7% |
| Bofors RP5 | <<locked>> | 82% | 37,739 psi | 58% | 2730 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 49,545 psi | 76% | 2887 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 40,074 psi | 62% | 2772 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 48,907 psi | 75% | 2930 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 51,300 psi | 79% | 2946 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 46,441 psi | 71% | 2861 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,426 psi | 70% | 2844 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,409 psi | 65% | 2766 fps | 100% |
| Hodgdon Retumbo | 84.4 gr | 88% | 37,695 psi | 58% | 2805 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 49,139 psi | 76% | 2953 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,557 psi | 42% | 1781 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,063 psi | 69% | 2812 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,053 psi | 79% | 2913 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 44,686 psi | 69% | 2822 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,686 psi | 69% | 2802 fps | 95.6% |
| IMR 7828 SSC | 82.4 gr | 86% | 41,640 psi | 64% | 2828 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 48,501 psi | 75% | 2861 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 46,804 psi | 72% | 2848 fps | 99.1% |
| Lovex S071 | <<locked>> | 82% | 31,937 psi | 49% | 2526 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 45,368 psi | 70% | 2851 fps | 97.3% |
| Norma 217 | <<locked>> | 96% | 36,303 psi | 56% | 2746 fps | 96.2% |
| Norma MRP | <<locked>> | 80% | 36,854 psi | 57% | 2736 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 46,166 psi | 71% | 2867 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 41,539 psi | 64% | 2835 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 45,179 psi | 70% | 2861 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 86% | 37,159 psi | 57% | 2703 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 43% | 1824 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,384 psi | 73% | 2897 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,745 psi | 70% | 2917 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,621 psi | 53% | 2713 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 46,035 psi | 71% | 2940 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 54,085 psi | 83% | 2946 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,366 psi | 67% | 2785 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 38,479 psi | 59% | 2720 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 49,545 psi | 76% | 2887 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,501 psi | 75% | 2861 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 46,804 psi | 72% | 2848 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,896 psi | 83% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,500 psi | 73% | 2805 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,159 psi | 59% | 2713 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 53,824 psi | 83% | 2943 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,425 psi | 68% | 2769 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 43,221 psi | 67% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,030 psi | 60% | 2703 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 51,576 psi | 79% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,601 psi | 73% | 2861 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,274 psi | 56% | 2628 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 47,079 psi | 72% | 2864 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 37,652 psi | 58% | 2713 fps | 99.3% |
| Vihtavuori N560 | <<locked>> | 84% | 42,931 psi | 66% | 2861 fps | 95% |
| Vihtavuori N565 | <<locked>> | 90% | 43,323 psi | 67% | 2841 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 47,282 psi | 73% | 2956 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,137 psi | 73% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,081 psi | 76% | 2933 fps | 99.3% |
| Winchester StaBALL HD | 78.8 gr | 80% | 29,936 psi | 46% | 2641 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,522 psi | 59% | 2684 fps | 95.5% |
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 74 powders for .300 Rem. Ultra Mag. loaded with the .308 | 155gr | Brenneke TAG. Hodgdon Retumbo delivers the highest muzzle velocity at 3,212 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,212 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 155.0 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. Winchester StaBALL HD, Hodgdon Retumbo, IMR 7828 SSC rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 155gr | Brenneke TAG 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.