Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 155gr | Berger VLD Hunting 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% | 58,769 psi | 90% | 3022 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,463 psi | 85% | 3009 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,609 psi | 89% | 3117 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 56,463 psi | 87% | 3061 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 58,392 psi | 90% | 3120 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,707 psi | 81% | 3012 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,442 psi | 73% | 2969 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,173 psi | 86% | 3061 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,624 psi | 89% | 3074 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,086 psi | 86% | 3048 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,537 psi | 90% | 3114 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,028 psi | 86% | 3031 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,941 psi | 86% | 3091 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,942 psi | 88% | 3117 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,188 psi | 86% | 3009 fps | 96.2% |
| Bofors RP15 | <<locked>> | 96% | 57,682 psi | 89% | 3097 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,767 psi | 86% | 3087 fps | 99.1% |
| Bofors RP5 | <<locked>> | 94% | 58,537 psi | 90% | 3114 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 57,305 psi | 88% | 3005 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,436 psi | 90% | 3104 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 57,130 psi | 88% | 3058 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,608 psi | 86% | 3015 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 58,146 psi | 89% | 3058 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,913 psi | 88% | 3038 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,521 psi | 87% | 2979 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,682 psi | 90% | 3222 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 58,073 psi | 89% | 3091 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,130 psi | 57% | 1982 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,608 psi | 86% | 2989 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,668 psi | 90% | 3031 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,709 psi | 86% | 2995 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,740 psi | 90% | 3038 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 94% | 56,202 psi | 86% | 3094 fps | 98.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,772 psi | 66% | 2867 fps | 96.1% |
| Lovex S065 | <<locked>> | 84% | 55,869 psi | 86% | 2972 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,885 psi | 89% | 3025 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,072 psi | 86% | 2986 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,797 psi | 87% | 3041 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 43,018 psi | 66% | 2894 fps | 98.4% |
| Norma MRP | <<locked>> | 90% | 54,708 psi | 84% | 3074 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 57,493 psi | 88% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,421 psi | 88% | 3117 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 56,463 psi | 87% | 3045 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,072 psi | 86% | 3045 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 58% | 2028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,666 psi | 86% | 3025 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,218 psi | 90% | 3110 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,869 psi | 86% | 3153 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,347 psi | 85% | 3100 fps | 98% |
| Rottweil R 903 | <<locked>> | 82% | 58,769 psi | 90% | 3009 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,508 psi | 89% | 3028 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 55,506 psi | 85% | 3035 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 57,305 psi | 88% | 3005 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,869 psi | 86% | 2972 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,885 psi | 89% | 3025 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,160 psi | 90% | 2877 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,085 psi | 85% | 2923 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,085 psi | 85% | 3028 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 58,291 psi | 90% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,521 psi | 85% | 2953 fps | 98% |
| Somchem S365 | <<locked>> | 88% | 58,378 psi | 90% | 3041 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,144 psi | 86% | 3005 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 55,883 psi | 86% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,506 psi | 85% | 2979 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,956 psi | 86% | 2986 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 58,450 psi | 90% | 3035 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,233 psi | 90% | 3061 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,421 psi | 90% | 3133 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 98% | 58,798 psi | 90% | 3110 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,883 psi | 86% | 3104 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,158 psi | 85% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,130 psi | 88% | 3058 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,679 psi | 84% | 3110 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,275 psi | 87% | 3002 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% | 36,143 psi | 56% | 2625 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 48,225 psi | 74% | 2890 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,238 psi | 71% | 2917 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 40,059 psi | 62% | 2756 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 44,193 psi | 68% | 2867 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 94% | 42,844 psi | 66% | 2822 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 90% | 33,707 psi | 52% | 2651 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,919 psi | 71% | 2897 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,592 psi | 82% | 3018 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,132 psi | 62% | 2749 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,609 psi | 59% | 2746 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,563 psi | 53% | 2651 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,110 psi | 46% | 2552 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,522 psi | 59% | 2795 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,750 psi | 81% | 2953 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 38,392 psi | 59% | 2740 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 42,105 psi | 65% | 2841 fps | 96% |
| Bofors RP5 | <<locked>> | 82% | 38,609 psi | 59% | 2746 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,415 psi | 78% | 2897 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 40,872 psi | 63% | 2785 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 49,835 psi | 77% | 2940 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 52,098 psi | 80% | 2956 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 84% | 44,019 psi | 68% | 2812 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,325 psi | 71% | 2858 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,337 psi | 67% | 2779 fps | 100% |
| Hodgdon Retumbo | 82 gr | 86% | 36,013 psi | 55% | 2756 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 49,922 psi | 77% | 2963 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 43% | 1781 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,876 psi | 71% | 2822 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,750 psi | 80% | 2923 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 45,701 psi | 70% | 2835 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,324 psi | 70% | 2808 fps | 95.7% |
| IMR 7828 SSC | 81.9 gr | 86% | 42,424 psi | 65% | 2841 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,842 psi | 61% | 2805 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 49,240 psi | 76% | 2867 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 47,761 psi | 74% | 2858 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 31,024 psi | 48% | 2497 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 46,238 psi | 71% | 2861 fps | 97.5% |
| Norma 217 | <<locked>> | 94% | 34,824 psi | 54% | 2703 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 37,884 psi | 58% | 2756 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 47,108 psi | 73% | 2881 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 42,409 psi | 65% | 2848 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 46,137 psi | 71% | 2871 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 35,346 psi | 54% | 2654 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 44% | 1824 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,283 psi | 74% | 2910 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,499 psi | 72% | 2923 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 35,578 psi | 55% | 2733 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,195 psi | 73% | 2959 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 55,187 psi | 85% | 2959 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 41,292 psi | 64% | 2736 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 39,421 psi | 61% | 2736 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,415 psi | 78% | 2897 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,240 psi | 76% | 2867 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 47,761 psi | 74% | 2858 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,621 psi | 84% | 2831 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,298 psi | 74% | 2815 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,088 psi | 60% | 2730 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 54,621 psi | 84% | 2949 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,382 psi | 70% | 2779 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 44,280 psi | 68% | 2831 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,059 psi | 62% | 2717 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 52,504 psi | 81% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,515 psi | 75% | 2871 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,217 psi | 57% | 2641 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 47,906 psi | 74% | 2874 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,827 psi | 60% | 2736 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 43,787 psi | 67% | 2871 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 44,425 psi | 68% | 2861 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 96% | 48,124 psi | 74% | 2969 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,022 psi | 74% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,835 psi | 77% | 2940 fps | 99.4% |
| Winchester StaBALL HD | 78.4 gr | 80% | 30,995 psi | 48% | 2671 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,465 psi | 61% | 2700 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 79 powders for .300 Rem. Ultra Mag. loaded with the .308 | 155gr | Berger VLD Hunting. Hodgdon Retumbo delivers the highest muzzle velocity at 3,222 fps; across all powders the maximum-charge window runs from 1,982 fps to 3,222 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 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. Winchester StaBALL HD, Hodgdon Retumbo, IMR 7828 SSC rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 155gr | Berger VLD Hunting 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.