Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Barnes TSX FN FB bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Winchester StaBALL HD 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% | 57,392 psi | 88% | 3041 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,030 psi | 89% | 3084 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,536 psi | 87% | 3136 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 82% | 58,392 psi | 90% | 3051 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 55,521 psi | 85% | 3084 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 57,609 psi | 89% | 3146 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,750 psi | 80% | 3031 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,340 psi | 71% | 2982 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,259 psi | 85% | 3091 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,507 psi | 87% | 3100 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,114 psi | 85% | 3071 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,653 psi | 89% | 3140 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 54,984 psi | 85% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,723 psi | 84% | 3110 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,637 psi | 86% | 3136 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 56,565 psi | 87% | 3120 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,592 psi | 84% | 3104 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 57,653 psi | 89% | 3140 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 56,362 psi | 87% | 3035 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,363 psi | 88% | 3127 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 56,028 psi | 86% | 3081 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 58,624 psi | 90% | 3100 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 57,203 psi | 88% | 3081 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,014 psi | 86% | 3061 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,637 psi | 86% | 3009 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,566 psi | 89% | 3241 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,116 psi | 88% | 3114 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,927 psi | 57% | 2014 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 58,465 psi | 90% | 3071 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,870 psi | 89% | 3061 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 58,465 psi | 90% | 3074 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,812 psi | 89% | 3064 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 94% | 55,390 psi | 85% | 3117 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 58,537 psi | 90% | 3054 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,753 psi | 87% | 3048 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 58,450 psi | 90% | 3058 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,883 psi | 86% | 3068 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 41,800 psi | 64% | 2900 fps | 97.9% |
| Norma MRP | <<locked>> | 92% | 57,609 psi | 89% | 3156 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 56,376 psi | 87% | 3068 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,217 psi | 87% | 3136 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 86% | 55,477 psi | 85% | 3068 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,085 psi | 85% | 3068 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 58% | 2060 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 58,508 psi | 90% | 3104 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,116 psi | 88% | 3133 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,940 psi | 85% | 3173 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,128 psi | 83% | 3114 fps | 97.6% |
| Rottweil R 903 | <<locked>> | 82% | 57,667 psi | 89% | 3035 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,623 psi | 87% | 3054 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 92% | 58,291 psi | 90% | 3117 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 56,362 psi | 87% | 3035 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,537 psi | 90% | 3054 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,753 psi | 87% | 3048 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,159 psi | 88% | 2907 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,957 psi | 89% | 3005 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,856 psi | 89% | 3110 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 57,145 psi | 88% | 3028 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,581 psi | 90% | 3038 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 57,232 psi | 88% | 3068 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,940 psi | 85% | 3028 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 58,711 psi | 90% | 2999 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,218 psi | 90% | 3061 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 58,755 psi | 90% | 3064 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 57,435 psi | 88% | 3061 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,869 psi | 88% | 3084 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,305 psi | 88% | 3153 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 98% | 57,464 psi | 88% | 3123 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,723 psi | 84% | 3120 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 58,450 psi | 90% | 3009 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,217 psi | 87% | 3084 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,682 psi | 89% | 3186 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,288 psi | 85% | 3025 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% | 34,737 psi | 53% | 2625 fps | 96.5% |
| Accurate 4350 | <<locked>> | 80% | 46,833 psi | 72% | 2910 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 48,588 psi | 75% | 2995 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 54,737 psi | 84% | 2999 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,102 psi | 60% | 2772 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 86% | 43,134 psi | 66% | 2881 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 94% | 41,872 psi | 64% | 2835 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 92% | 35,041 psi | 54% | 2720 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,991 psi | 69% | 2920 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,504 psi | 81% | 3041 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,146 psi | 60% | 2762 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 84% | 40,408 psi | 62% | 2822 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,475 psi | 52% | 2657 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,154 psi | 48% | 2615 fps | 95.7% |
| Alliant Reloder-26 | 83.4 gr | 80% | 37,202 psi | 57% | 2799 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 40,030 psi | 62% | 2812 fps | 95.6% |
| Bofors RP30 | <<locked>> | 92% | 40,814 psi | 63% | 2841 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 40,408 psi | 62% | 2822 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 49,443 psi | 76% | 2920 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 90% | 39,842 psi | 61% | 2795 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 48,718 psi | 75% | 2963 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 80% | 51,126 psi | 79% | 2979 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 46,267 psi | 71% | 2890 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,281 psi | 70% | 2871 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,293 psi | 65% | 2795 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,507 psi | 58% | 2828 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 48,907 psi | 75% | 2979 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 42% | 1811 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,947 psi | 69% | 2844 fps | 98.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,952 psi | 78% | 2949 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 44,541 psi | 69% | 2854 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,469 psi | 68% | 2828 fps | 95.2% |
| IMR 7828 SSC | 85.7 gr | 88% | 44,512 psi | 69% | 2920 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 48,240 psi | 74% | 2890 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 46,514 psi | 72% | 2874 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 31,734 psi | 49% | 2549 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 45,150 psi | 69% | 2877 fps | 97% |
| Norma 217 | <<locked>> | 96% | 36,129 psi | 56% | 2769 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 36,767 psi | 57% | 2762 fps | 96% |
| Norma URP | <<locked>> | 80% | 45,876 psi | 71% | 2897 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 41,336 psi | 64% | 2858 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 44,991 psi | 69% | 2887 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 36,927 psi | 57% | 2726 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,050 psi | 43% | 1854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,094 psi | 72% | 2927 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,426 psi | 70% | 2943 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,505 psi | 53% | 2733 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,963 psi | 71% | 2966 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 53,722 psi | 83% | 2979 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,207 psi | 66% | 2815 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 38,363 psi | 59% | 2746 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 49,443 psi | 76% | 2920 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,240 psi | 74% | 2890 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 46,514 psi | 72% | 2874 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,693 psi | 83% | 2864 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,355 psi | 73% | 2835 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,029 psi | 59% | 2740 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 53,548 psi | 82% | 2976 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,295 psi | 68% | 2795 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 43,062 psi | 66% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,870 psi | 60% | 2726 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 51,285 psi | 79% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,456 psi | 73% | 2894 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 38,827 psi | 60% | 2713 fps | 96% |
| Vihtavuori N550 | <<locked>> | 80% | 46,891 psi | 72% | 2890 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 37,550 psi | 58% | 2743 fps | 99.1% |
| Vihtavuori N560 | <<locked>> | 86% | 46,006 psi | 71% | 2953 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 90% | 43,221 psi | 67% | 2867 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 96% | 47,108 psi | 73% | 2982 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,007 psi | 72% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,892 psi | 75% | 2963 fps | 99.1% |
| Winchester StaBALL HD | 80.1 gr | 80% | 29,747 psi | 46% | 2657 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,276 psi | 59% | 2707 fps | 95.1% |
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 | Barnes TSX FN FB. Hodgdon Retumbo delivers the highest muzzle velocity at 3,241 fps; across all powders the maximum-charge window runs from 2,014 fps to 3,241 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 1:15.0 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. Alliant Reloder-26, Winchester StaBALL HD, IMR 7828 SSC rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Barnes TSX FN FB 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.