Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Speer TBBC 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.
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% | 58,726 psi | 90% | 3058 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,332 psi | 85% | 3041 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,479 psi | 88% | 3150 fps | 97.9% |
| ADI AR 2209 | <<locked>> | 90% | 56,347 psi | 87% | 3094 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 58,508 psi | 90% | 3156 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,721 psi | 81% | 3045 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,398 psi | 73% | 3002 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,289 psi | 87% | 3104 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,406 psi | 88% | 3110 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,956 psi | 86% | 3081 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,682 psi | 90% | 3153 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,028 psi | 86% | 3068 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,767 psi | 86% | 3123 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,855 psi | 88% | 3153 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,202 psi | 86% | 3045 fps | 96% |
| Bofors RP15 | <<locked>> | 96% | 57,595 psi | 89% | 3133 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,796 psi | 86% | 3120 fps | 98.9% |
| Bofors RP5 | <<locked>> | 94% | 58,682 psi | 90% | 3153 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 57,246 psi | 88% | 3045 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,378 psi | 90% | 3140 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 56,942 psi | 88% | 3094 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,535 psi | 85% | 3048 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 58,117 psi | 89% | 3091 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,927 psi | 88% | 3074 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,550 psi | 87% | 3018 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,682 psi | 90% | 3258 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 58,073 psi | 89% | 3127 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,086 psi | 57% | 2014 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,608 psi | 86% | 3025 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,595 psi | 90% | 3068 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,767 psi | 86% | 3031 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,998 psi | 85% | 3018 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 94% | 56,333 psi | 87% | 3133 fps | 98.6% |
| Lovex S065 | <<locked>> | 84% | 55,811 psi | 86% | 3012 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,725 psi | 89% | 3058 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 56,072 psi | 86% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,739 psi | 87% | 3077 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 43,047 psi | 66% | 2923 fps | 98.2% |
| Norma MRP | <<locked>> | 92% | 58,740 psi | 90% | 3173 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,319 psi | 88% | 3077 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,290 psi | 88% | 3150 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 56,391 psi | 87% | 3077 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,231 psi | 87% | 3081 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,855 psi | 58% | 2060 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,622 psi | 86% | 3061 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,233 psi | 90% | 3146 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,912 psi | 86% | 3186 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,492 psi | 85% | 3133 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 58,755 psi | 90% | 3048 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,450 psi | 88% | 3064 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 90% | 55,405 psi | 85% | 3071 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 57,246 psi | 88% | 3045 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,811 psi | 86% | 3012 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,725 psi | 89% | 3058 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,088 psi | 89% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,143 psi | 85% | 2959 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,984 psi | 85% | 3064 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 58,088 psi | 89% | 3038 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,492 psi | 85% | 2989 fps | 97.8% |
| Somchem S365 | <<locked>> | 88% | 58,291 psi | 90% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,217 psi | 87% | 3041 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 55,883 psi | 86% | 2956 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,361 psi | 85% | 3015 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,941 psi | 86% | 3018 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 58,421 psi | 90% | 3071 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,131 psi | 89% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,349 psi | 90% | 3166 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 58,726 psi | 90% | 3143 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,941 psi | 86% | 3136 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,230 psi | 85% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,130 psi | 88% | 3097 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,578 psi | 84% | 3143 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,260 psi | 87% | 3035 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% | 36,013 psi | 55% | 2651 fps | 97% |
| Accurate 4350 | <<locked>> | 80% | 48,037 psi | 74% | 2927 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,253 psi | 71% | 2949 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 39,929 psi | 61% | 2785 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 86% | 44,034 psi | 68% | 2897 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 42,844 psi | 66% | 2854 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 33,765 psi | 52% | 2680 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,803 psi | 70% | 2933 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,447 psi | 82% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,987 psi | 62% | 2782 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,537 psi | 59% | 2776 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,577 psi | 53% | 2684 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,023 psi | 46% | 2575 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,377 psi | 59% | 2825 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,779 psi | 81% | 2986 fps | 95% |
| Bofors RP15 | <<locked>> | 86% | 41,031 psi | 63% | 2831 fps | 96% |
| Bofors RP30 | <<locked>> | 92% | 41,974 psi | 65% | 2867 fps | 95.7% |
| Bofors RP5 | <<locked>> | 82% | 38,537 psi | 59% | 2776 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 50,299 psi | 77% | 2930 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 40,901 psi | 63% | 2818 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 49,777 psi | 77% | 2976 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 52,098 psi | 80% | 2992 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 47,137 psi | 73% | 2907 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,151 psi | 71% | 2887 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,236 psi | 67% | 2812 fps | 100% |
| Hodgdon Retumbo | 85.5 gr | 88% | 38,508 psi | 59% | 2854 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 49,835 psi | 77% | 2995 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 43% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,730 psi | 70% | 2854 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,634 psi | 79% | 2956 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 45,556 psi | 70% | 2867 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,382 psi | 70% | 2844 fps | 95.5% |
| IMR 7828 SSC | 83.5 gr | 86% | 42,424 psi | 65% | 2874 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 49,313 psi | 76% | 2907 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 47,630 psi | 73% | 2890 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 33,083 psi | 51% | 2582 fps | 95.9% |
| Norma 204 | <<locked>> | 80% | 46,166 psi | 71% | 2894 fps | 97.2% |
| Norma 217 | <<locked>> | 94% | 34,838 psi | 54% | 2730 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 37,797 psi | 58% | 2785 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 46,978 psi | 72% | 2913 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 42,337 psi | 65% | 2877 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 46,064 psi | 71% | 2904 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 38,000 psi | 58% | 2749 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,369 psi | 44% | 1854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,196 psi | 74% | 2943 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,514 psi | 72% | 2959 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 35,578 psi | 55% | 2762 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,253 psi | 73% | 2992 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 55,013 psi | 85% | 2995 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 44,164 psi | 68% | 2828 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 39,450 psi | 61% | 2769 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 50,299 psi | 77% | 2930 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,313 psi | 76% | 2907 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 47,630 psi | 73% | 2890 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,418 psi | 84% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,283 psi | 74% | 2848 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,117 psi | 60% | 2762 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 54,679 psi | 84% | 2989 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,208 psi | 70% | 2812 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 44,106 psi | 68% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,030 psi | 62% | 2749 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 52,344 psi | 81% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,341 psi | 74% | 2907 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,173 psi | 57% | 2674 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 47,877 psi | 74% | 2907 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 38,682 psi | 60% | 2766 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 84% | 43,758 psi | 67% | 2904 fps | 95% |
| Vihtavuori N565 | <<locked>> | 90% | 44,396 psi | 68% | 2894 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 96% | 48,109 psi | 74% | 2999 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,848 psi | 74% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,777 psi | 77% | 2976 fps | 99.3% |
| Winchester StaBALL HD | 79.9 gr | 80% | 30,922 psi | 48% | 2694 fps | 99.6% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,392 psi | 61% | 2730 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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Speer TBBC. Hodgdon Retumbo delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,258 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 150.0 gr projectile in 0.308" calls for a 1:14.5 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 | 150gr | Speer TBBC 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.