Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Nosler Solid Base 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 ReloadSwiss RS 76.
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% | 58,610 psi | 90% | 3058 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,405 psi | 85% | 3045 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,551 psi | 89% | 3150 fps | 97.9% |
| ADI AR 2209 | <<locked>> | 90% | 56,405 psi | 87% | 3094 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 58,407 psi | 90% | 3156 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,794 psi | 81% | 3048 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,311 psi | 73% | 3002 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,144 psi | 86% | 3100 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,493 psi | 88% | 3110 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,854 psi | 86% | 3081 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,523 psi | 90% | 3150 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,912 psi | 86% | 3064 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,854 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,898 psi | 88% | 3153 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,101 psi | 86% | 3045 fps | 96% |
| Bofors RP15 | <<locked>> | 96% | 57,464 psi | 88% | 3130 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,666 psi | 86% | 3120 fps | 98.9% |
| Bofors RP5 | <<locked>> | 94% | 58,523 psi | 90% | 3150 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 57,305 psi | 88% | 3045 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,494 psi | 90% | 3140 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 57,000 psi | 88% | 3094 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,622 psi | 86% | 3051 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 57,957 psi | 89% | 3091 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,768 psi | 87% | 3071 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,420 psi | 87% | 3018 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,537 psi | 90% | 3258 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 58,131 psi | 89% | 3130 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,101 psi | 57% | 2018 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,506 psi | 85% | 3022 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,668 psi | 90% | 3068 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 55,622 psi | 86% | 3031 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,668 psi | 90% | 3074 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 94% | 56,231 psi | 87% | 3130 fps | 98.6% |
| Lovex S065 | <<locked>> | 84% | 55,869 psi | 86% | 3012 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,812 psi | 89% | 3061 fps | 99.9% |
| Lovex S071 | <<locked>> | 98% | 55,985 psi | 86% | 3018 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,797 psi | 87% | 3081 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 42,946 psi | 66% | 2923 fps | 98.2% |
| Norma MRP | <<locked>> | 92% | 58,595 psi | 90% | 3173 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,406 psi | 88% | 3081 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,334 psi | 88% | 3153 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 56,463 psi | 87% | 3077 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,115 psi | 86% | 3077 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,869 psi | 58% | 2060 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,506 psi | 85% | 3058 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,117 psi | 89% | 3146 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,999 psi | 86% | 3189 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,361 psi | 85% | 3133 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 58,798 psi | 90% | 3045 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,290 psi | 88% | 3064 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 90% | 55,492 psi | 85% | 3071 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 57,305 psi | 88% | 3045 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,869 psi | 86% | 3012 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,812 psi | 89% | 3061 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,943 psi | 89% | 2913 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,071 psi | 85% | 2959 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,071 psi | 85% | 3064 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 58,160 psi | 90% | 3041 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,579 psi | 86% | 2992 fps | 97.8% |
| Somchem S365 | <<locked>> | 88% | 58,378 psi | 90% | 3081 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,086 psi | 86% | 3041 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 55,970 psi | 86% | 2959 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,448 psi | 85% | 3018 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,796 psi | 86% | 3018 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 58,508 psi | 90% | 3074 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,986 psi | 89% | 3097 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,175 psi | 90% | 3166 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 58,798 psi | 90% | 3143 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 3136 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,129 psi | 85% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,188 psi | 88% | 3097 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,665 psi | 84% | 3143 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,159 psi | 86% | 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% | 36,042 psi | 55% | 2654 fps | 97% |
| Accurate 4350 | <<locked>> | 80% | 48,095 psi | 74% | 2930 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,151 psi | 71% | 2949 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 39,972 psi | 62% | 2789 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 86% | 44,077 psi | 68% | 2900 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 42,728 psi | 66% | 2854 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 33,678 psi | 52% | 2677 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,861 psi | 71% | 2936 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,490 psi | 82% | 3054 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,030 psi | 62% | 2782 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,595 psi | 59% | 2779 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,490 psi | 53% | 2684 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,037 psi | 46% | 2579 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,450 psi | 59% | 2825 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,707 psi | 81% | 2986 fps | 95% |
| Bofors RP15 | <<locked>> | 86% | 41,075 psi | 63% | 2831 fps | 96% |
| Bofors RP30 | <<locked>> | 92% | 42,003 psi | 65% | 2867 fps | 95.7% |
| Bofors RP5 | <<locked>> | 82% | 38,595 psi | 59% | 2779 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 50,372 psi | 78% | 2933 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 40,828 psi | 63% | 2815 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 49,647 psi | 76% | 2972 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 51,967 psi | 80% | 2992 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 47,021 psi | 72% | 2904 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,224 psi | 71% | 2887 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,265 psi | 67% | 2812 fps | 100% |
| Hodgdon Retumbo | 85.5 gr | 88% | 38,551 psi | 59% | 2854 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 49,922 psi | 77% | 2995 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,644 psi | 43% | 1811 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,788 psi | 70% | 2858 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,677 psi | 80% | 2959 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 45,600 psi | 70% | 2867 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,295 psi | 70% | 2841 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 86% | 42,308 psi | 65% | 2871 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 49,211 psi | 76% | 2904 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 47,500 psi | 73% | 2890 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 32,996 psi | 51% | 2579 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 46,035 psi | 71% | 2894 fps | 97.2% |
| Norma 217 | <<locked>> | 94% | 34,751 psi | 53% | 2730 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 37,695 psi | 58% | 2782 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 46,847 psi | 72% | 2910 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 42,366 psi | 65% | 2881 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 45,934 psi | 71% | 2904 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 84% | 35,302 psi | 54% | 2684 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,253 psi | 43% | 1854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,225 psi | 74% | 2943 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,398 psi | 71% | 2959 fps | 99.9% |
| ReloadSwiss RS 76 | 89.4 gr | 86% | 35,520 psi | 55% | 2759 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,166 psi | 73% | 2989 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 54,882 psi | 84% | 2995 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 44,063 psi | 68% | 2828 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 39,334 psi | 61% | 2766 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,372 psi | 78% | 2933 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,211 psi | 76% | 2904 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 47,500 psi | 73% | 2890 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,462 psi | 84% | 2871 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,370 psi | 74% | 2848 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,001 psi | 60% | 2759 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 54,534 psi | 84% | 2989 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,237 psi | 70% | 2812 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 44,164 psi | 68% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,958 psi | 61% | 2746 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 52,228 psi | 80% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,385 psi | 74% | 2907 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,086 psi | 57% | 2671 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 47,892 psi | 74% | 2910 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 38,740 psi | 60% | 2766 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 84% | 43,801 psi | 67% | 2904 fps | 95% |
| Vihtavuori N565 | <<locked>> | 90% | 44,295 psi | 68% | 2890 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 48,182 psi | 74% | 3002 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,906 psi | 74% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,821 psi | 77% | 2976 fps | 99.3% |
| Winchester StaBALL HD | 79.8 gr | 80% | 30,864 psi | 48% | 2694 fps | 99.6% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,276 psi | 60% | 2726 fps | 95.4% |
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 | Nosler Solid Base. Hodgdon Retumbo delivers the highest muzzle velocity at 3,258 fps; across all powders the maximum-charge window runs from 2,018 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 1:14.0 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, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Nosler Solid Base 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.