Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Sellier & Bellot SPCE bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Norma MRP.
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>> | 92% | 55,724 psi | 86% | 3015 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,333 psi | 87% | 3058 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,668 psi | 90% | 3169 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 57,392 psi | 88% | 3110 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 92% | 55,448 psi | 85% | 3110 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,751 psi | 83% | 3064 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,385 psi | 74% | 3018 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,667 psi | 89% | 3107 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,072 psi | 88% | 3114 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,407 psi | 90% | 3123 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,971 psi | 88% | 3097 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,695 psi | 86% | 3104 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,145 psi | 88% | 3081 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,043 psi | 88% | 3140 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,175 psi | 90% | 3169 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,058 psi | 88% | 3061 fps | 96.3% |
| Bofors RP15 | <<locked>> | 96% | 58,610 psi | 90% | 3146 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,000 psi | 88% | 3140 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 55,695 psi | 86% | 3104 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 57,914 psi | 89% | 3054 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 55,317 psi | 85% | 3091 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 57,841 psi | 89% | 3107 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,434 psi | 87% | 3064 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 90% | 55,100 psi | 85% | 3045 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,841 psi | 89% | 3087 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,508 psi | 89% | 3031 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,753 psi | 86% | 3209 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,766 psi | 84% | 3074 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,028 psi | 57% | 2021 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,434 psi | 87% | 3038 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,680 psi | 86% | 3022 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 56,681 psi | 87% | 3048 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,898 psi | 86% | 3031 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 94% | 57,377 psi | 88% | 3150 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,700 psi | 67% | 2917 fps | 96.3% |
| Lovex S065 | <<locked>> | 84% | 56,681 psi | 87% | 3025 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,595 psi | 90% | 3071 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,130 psi | 88% | 3035 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,769 psi | 89% | 3094 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 44,164 psi | 68% | 2946 fps | 98.5% |
| Norma MRP | <<locked>> | 90% | 55,738 psi | 86% | 3127 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 58,247 psi | 90% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,624 psi | 90% | 3169 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 57,450 psi | 88% | 3094 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,435 psi | 88% | 3097 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,942 psi | 58% | 2067 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,507 psi | 87% | 3071 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,882 psi | 84% | 3097 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,290 psi | 88% | 3205 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,840 psi | 87% | 3156 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 90% | 58,218 psi | 90% | 3077 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 56,478 psi | 87% | 3084 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 57,914 psi | 89% | 3054 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,681 psi | 87% | 3025 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,595 psi | 90% | 3071 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,610 psi | 90% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,796 psi | 86% | 2972 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,057 psi | 86% | 3081 fps | 99.3% |
| Somchem S361 | <<locked>> | 88% | 56,333 psi | 87% | 3002 fps | 98% |
| Somchem S365 | <<locked>> | 86% | 55,463 psi | 85% | 3041 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,985 psi | 88% | 3054 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 56,579 psi | 87% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,289 psi | 87% | 3028 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,884 psi | 88% | 3031 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,666 psi | 86% | 3031 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,303 psi | 85% | 3058 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,390 psi | 85% | 3120 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 96% | 55,912 psi | 86% | 3097 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,305 psi | 88% | 3156 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,014 psi | 86% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,030 psi | 89% | 3110 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,072 psi | 86% | 3163 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,217 psi | 88% | 3051 fps | 99.4% |
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% | 36,651 psi | 56% | 2667 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 48,820 psi | 75% | 2940 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 47,065 psi | 72% | 2966 fps | 95.4% |
| ADI AR 2209 | <<locked>> | 80% | 40,582 psi | 62% | 2802 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 44,773 psi | 69% | 2913 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 94% | 43,642 psi | 67% | 2874 fps | 96% |
| ADI AR 2225 | <<locked>> | 90% | 34,316 psi | 53% | 2697 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,002 psi | 63% | 2802 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,601 psi | 72% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,462 psi | 84% | 3068 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,625 psi | 63% | 2795 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 82% | 39,334 psi | 61% | 2795 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,128 psi | 54% | 2694 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,560 psi | 47% | 2592 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,262 psi | 60% | 2841 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,476 psi | 82% | 3002 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 39,088 psi | 60% | 2785 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 40,001 psi | 62% | 2822 fps | 95% |
| Bofors RP5 | <<locked>> | 82% | 39,334 psi | 61% | 2795 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 50,995 psi | 78% | 2946 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 41,582 psi | 64% | 2831 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 50,488 psi | 78% | 2989 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 52,779 psi | 81% | 3005 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 84% | 44,657 psi | 69% | 2858 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,905 psi | 72% | 2904 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,961 psi | 68% | 2822 fps | 100% |
| Hodgdon Retumbo | 84.8 gr | 86% | 36,680 psi | 56% | 2802 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 50,894 psi | 78% | 3012 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,702 psi | 43% | 1818 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,369 psi | 71% | 2867 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,315 psi | 81% | 2969 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,282 psi | 71% | 2881 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,963 psi | 71% | 2858 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 86% | 43,192 psi | 66% | 2890 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,770 psi | 63% | 2851 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 49,835 psi | 77% | 2913 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,312 psi | 74% | 2904 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 31,488 psi | 48% | 2536 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 46,804 psi | 72% | 2907 fps | 97.5% |
| Norma 217 | <<locked>> | 94% | 35,636 psi | 55% | 2753 fps | 95.6% |
| Norma MRP | 81.9 gr | 80% | 38,624 psi | 59% | 2802 fps | 96.8% |
| Norma URP | <<locked>> | 80% | 47,718 psi | 73% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 43,265 psi | 67% | 2897 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 46,731 psi | 72% | 2917 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 35,969 psi | 55% | 2700 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 44% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,081 psi | 76% | 2956 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,384 psi | 73% | 2976 fps | 99.9% |
| ReloadSwiss RS 76 | 88.6 gr | 84% | 33,620 psi | 52% | 2703 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,686 psi | 69% | 2936 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 41,800 psi | 64% | 2779 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 40,118 psi | 62% | 2782 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 50,995 psi | 78% | 2946 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,835 psi | 77% | 2913 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,312 psi | 74% | 2904 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,143 psi | 85% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,907 psi | 75% | 2861 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,784 psi | 61% | 2779 fps | 95.8% |
| Somchem S361 | <<locked>> | 82% | 46,035 psi | 71% | 2828 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 44,889 psi | 69% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,669 psi | 63% | 2762 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 53,069 psi | 82% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,066 psi | 76% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,782 psi | 58% | 2687 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 48,704 psi | 75% | 2923 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,436 psi | 61% | 2779 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 44,715 psi | 69% | 2923 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 90% | 45,324 psi | 70% | 2910 fps | 96% |
| Vihtavuori N568 | <<locked>> | 96% | 49,211 psi | 76% | 3018 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,631 psi | 75% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,662 psi | 78% | 2992 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,647 psi | 49% | 2710 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,958 psi | 61% | 2743 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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Sellier & Bellot SPCE. Hodgdon Retumbo delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,209 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 1:16.0 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. Hodgdon Retumbo, ReloadSwiss RS 76, Norma MRP rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Sellier & Bellot SPCE 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.