Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 155gr | Berger VLD Target bullet and 73 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 58,421 psi | 90% | 3018 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,085 psi | 85% | 3002 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,305 psi | 88% | 3114 fps | 98% |
| ADI AR 2209 | <<locked>> | 90% | 56,101 psi | 86% | 3051 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 58,059 psi | 89% | 3114 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,446 psi | 81% | 3009 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,166 psi | 73% | 2966 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,999 psi | 86% | 3061 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,232 psi | 88% | 3071 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,753 psi | 86% | 3041 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,204 psi | 90% | 3110 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,651 psi | 86% | 3025 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,405 psi | 85% | 3084 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,579 psi | 87% | 3114 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,970 psi | 86% | 3005 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 57,348 psi | 88% | 3094 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,245 psi | 85% | 3081 fps | 99% |
| Bofors RP5 | <<locked>> | 94% | 58,204 psi | 90% | 3110 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 57,145 psi | 88% | 3005 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,160 psi | 90% | 3100 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 56,797 psi | 87% | 3054 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,463 psi | 85% | 3012 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 57,827 psi | 89% | 3051 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,594 psi | 87% | 3031 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,347 psi | 87% | 2979 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,363 psi | 90% | 3215 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,928 psi | 89% | 3087 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,014 psi | 57% | 1978 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,448 psi | 85% | 2986 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,537 psi | 90% | 3028 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,579 psi | 86% | 2992 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,450 psi | 90% | 3031 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 56,057 psi | 86% | 3094 fps | 98.7% |
| Lovex S065 | <<locked>> | 84% | 55,724 psi | 86% | 2969 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,522 psi | 89% | 3018 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,724 psi | 86% | 2979 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,681 psi | 87% | 3041 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 42,728 psi | 66% | 2890 fps | 98.3% |
| Norma MRP | <<locked>> | 92% | 58,465 psi | 90% | 3133 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,116 psi | 88% | 3038 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,072 psi | 88% | 3114 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 56,289 psi | 87% | 3038 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,782 psi | 86% | 3041 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,811 psi | 58% | 2021 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,332 psi | 85% | 3018 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,841 psi | 89% | 3104 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,579 psi | 86% | 3146 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,839 psi | 84% | 3094 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 82% | 58,595 psi | 90% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,188 psi | 88% | 3025 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 90% | 55,143 psi | 85% | 3031 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 57,145 psi | 88% | 3005 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,724 psi | 86% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,522 psi | 89% | 3018 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,798 psi | 89% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,755 psi | 90% | 2976 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 58,653 psi | 90% | 3084 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 58,102 psi | 89% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,230 psi | 85% | 2949 fps | 97.9% |
| Somchem S365 | <<locked>> | 88% | 58,175 psi | 90% | 3038 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,811 psi | 86% | 2999 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 55,753 psi | 86% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,158 psi | 85% | 2976 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,680 psi | 86% | 2979 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 58,334 psi | 90% | 3031 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,899 psi | 89% | 3058 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,088 psi | 89% | 3130 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 98% | 58,436 psi | 90% | 3104 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,608 psi | 86% | 3100 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,042 psi | 85% | 2927 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,000 psi | 88% | 3058 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,552 psi | 90% | 3163 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,985 psi | 86% | 2995 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% | 35,984 psi | 55% | 2621 fps | 97.2% |
| Accurate 4350 | <<locked>> | 80% | 48,037 psi | 74% | 2890 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 45,948 psi | 71% | 2910 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 39,784 psi | 61% | 2749 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 43,888 psi | 68% | 2861 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 94% | 42,569 psi | 66% | 2818 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 90% | 33,605 psi | 52% | 2648 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,745 psi | 70% | 2897 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,185 psi | 82% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,987 psi | 62% | 2749 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,464 psi | 59% | 2743 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,389 psi | 53% | 2651 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,878 psi | 46% | 2546 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,203 psi | 59% | 2789 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,518 psi | 81% | 2949 fps | 95.2% |
| Bofors RP15 | <<locked>> | 84% | 38,232 psi | 59% | 2736 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 41,785 psi | 64% | 2831 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 38,464 psi | 59% | 2743 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 50,285 psi | 77% | 2894 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 40,625 psi | 63% | 2779 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 49,516 psi | 76% | 2936 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 51,909 psi | 80% | 2953 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 84% | 43,729 psi | 67% | 2805 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,035 psi | 71% | 2851 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,134 psi | 66% | 2772 fps | 100% |
| Hodgdon Retumbo | 83.6 gr | 88% | 38,435 psi | 59% | 2822 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 49,748 psi | 77% | 2959 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 43% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,542 psi | 70% | 2815 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,445 psi | 79% | 2917 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 45,542 psi | 70% | 2831 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,208 psi | 70% | 2805 fps | 95.7% |
| IMR 7828 SSC | 81.6 gr | 86% | 42,264 psi | 65% | 2838 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 49,110 psi | 76% | 2864 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 47,442 psi | 73% | 2851 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 30,748 psi | 47% | 2490 fps | 95% |
| Norma 204 | <<locked>> | 80% | 45,905 psi | 71% | 2854 fps | 97.4% |
| Norma 217 | <<locked>> | 94% | 34,592 psi | 53% | 2697 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 37,594 psi | 58% | 2749 fps | 96.6% |
| Norma URP | <<locked>> | 80% | 46,775 psi | 72% | 2874 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 42,105 psi | 65% | 2841 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 45,788 psi | 70% | 2867 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,085 psi | 54% | 2648 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,268 psi | 44% | 1818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,124 psi | 74% | 2907 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,311 psi | 71% | 2920 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 35,331 psi | 54% | 2726 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 46,717 psi | 72% | 2949 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 54,810 psi | 84% | 2953 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,874 psi | 68% | 2792 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 39,262 psi | 60% | 2730 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 50,285 psi | 77% | 2894 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,110 psi | 76% | 2864 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 47,442 psi | 73% | 2851 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,273 psi | 84% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,124 psi | 74% | 2808 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,957 psi | 60% | 2726 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 54,418 psi | 84% | 2946 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,092 psi | 69% | 2772 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 43,888 psi | 68% | 2828 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,914 psi | 61% | 2717 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 52,170 psi | 80% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,341 psi | 74% | 2867 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,956 psi | 57% | 2638 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 47,761 psi | 74% | 2871 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 38,653 psi | 59% | 2730 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 43,627 psi | 67% | 2867 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 44,106 psi | 68% | 2854 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 47,848 psi | 74% | 2963 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,703 psi | 73% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,661 psi | 76% | 2936 fps | 99.3% |
| Winchester StaBALL HD | 78 gr | 80% | 30,748 psi | 47% | 2661 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,189 psi | 60% | 2694 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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 155gr | Berger VLD Target. Hodgdon Retumbo delivers the highest muzzle velocity at 3,215 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,215 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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, Alliant Reloder-33 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 | Berger VLD Target they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.