Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Barnes TAC-X bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Norma MRP and Vihtavuori N560.
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% | 54,853 psi | 84% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,680 psi | 86% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 58,073 psi | 89% | 3163 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 82% | 56,608 psi | 87% | 3025 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,261 psi | 88% | 3110 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 55,158 psi | 85% | 3107 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,429 psi | 76% | 2989 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,034 psi | 68% | 2936 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,957 psi | 89% | 3045 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,797 psi | 87% | 3114 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 58,363 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,579 psi | 87% | 3091 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,100 psi | 85% | 3100 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,144 psi | 86% | 3077 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,898 psi | 86% | 3130 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,159 psi | 88% | 3163 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,246 psi | 88% | 3061 fps | 96% |
| Bofors RP15 | <<locked>> | 98% | 57,972 psi | 89% | 3143 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,735 psi | 80% | 3058 fps | 98.1% |
| Bofors RP5 | <<locked>> | 94% | 55,100 psi | 85% | 3100 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 58,117 psi | 89% | 3058 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,926 psi | 85% | 3087 fps | 99% |
| Hodgdon H414 | <<locked>> | 86% | 57,754 psi | 89% | 3110 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,579 psi | 87% | 3068 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 54,824 psi | 84% | 3041 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,769 psi | 89% | 3087 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,116 psi | 88% | 3031 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,694 psi | 84% | 3196 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 54,723 psi | 84% | 3081 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 57% | 2001 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,362 psi | 87% | 3035 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,086 psi | 86% | 3028 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 56,376 psi | 87% | 3045 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,956 psi | 86% | 3031 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 96% | 56,840 psi | 87% | 3143 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 56,681 psi | 87% | 3025 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 58,508 psi | 90% | 3071 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,898 psi | 86% | 3022 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,798 psi | 89% | 3094 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 39,450 psi | 61% | 2851 fps | 96.9% |
| Norma MRP | <<locked>> | 92% | 54,984 psi | 85% | 3120 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 58,059 psi | 89% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,812 psi | 89% | 3163 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 57,246 psi | 88% | 3094 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,637 psi | 87% | 3091 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,507 psi | 58% | 2047 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,754 psi | 89% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,188 psi | 86% | 3074 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,723 psi | 84% | 3100 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,304 psi | 87% | 3196 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,024 psi | 79% | 3064 fps | 96.7% |
| Rottweil R 903 | <<locked>> | 82% | 55,535 psi | 85% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,218 psi | 90% | 3074 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 56,043 psi | 86% | 3081 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 58,117 psi | 89% | 3058 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,681 psi | 87% | 3025 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 58,508 psi | 90% | 3071 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,595 psi | 89% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,550 psi | 85% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,086 psi | 86% | 2976 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,608 psi | 86% | 3074 fps | 99.1% |
| Somchem S355 | <<locked>> | 82% | 55,288 psi | 85% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,478 psi | 87% | 3005 fps | 97.8% |
| Somchem S365 | <<locked>> | 90% | 58,769 psi | 90% | 3091 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,623 psi | 87% | 3051 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 56,782 psi | 87% | 2972 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,086 psi | 86% | 3028 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,420 psi | 87% | 3028 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 55,463 psi | 85% | 3031 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 58,262 psi | 90% | 3104 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 58,798 psi | 90% | 3176 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 98% | 54,882 psi | 84% | 3087 fps | 98% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,822 psi | 80% | 3071 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,057 psi | 86% | 2979 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,957 psi | 89% | 3110 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,288 psi | 84% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,840 psi | 87% | 3045 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% | 33,185 psi | 51% | 2589 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 44,918 psi | 69% | 2874 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 90% | 50,009 psi | 77% | 3025 fps | 96% |
| ADI AR 2208 | <<locked>> | 80% | 53,142 psi | 82% | 2972 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 40,248 psi | 62% | 2795 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 88% | 44,483 psi | 68% | 2907 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 96% | 42,960 psi | 66% | 2858 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 94% | 35,853 psi | 55% | 2743 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 54,389 psi | 84% | 2995 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,076 psi | 66% | 2884 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,401 psi | 78% | 3012 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 40,364 psi | 62% | 2792 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 84% | 38,566 psi | 59% | 2782 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,010 psi | 49% | 2628 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,937 psi | 49% | 2641 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,288 psi | 54% | 2759 fps | 98% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,606 psi | 83% | 2999 fps | 95% |
| Bofors RP15 | <<locked>> | 88% | 41,075 psi | 63% | 2835 fps | 95.8% |
| Bofors RP30 | <<locked>> | 94% | 41,655 psi | 64% | 2867 fps | 95.4% |
| Bofors RP5 | <<locked>> | 84% | 38,566 psi | 59% | 2782 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 47,761 psi | 74% | 2884 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 92% | 41,075 psi | 63% | 2822 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 46,804 psi | 72% | 2923 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 49,443 psi | 76% | 2946 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 47,572 psi | 73% | 2913 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,702 psi | 72% | 2900 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,495 psi | 62% | 2762 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,406 psi | 59% | 2851 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 46,789 psi | 72% | 2943 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 42% | 1801 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,366 psi | 67% | 2812 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,313 psi | 76% | 2917 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 42,801 psi | 66% | 2818 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,934 psi | 71% | 2854 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 90% | 45,745 psi | 70% | 2946 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 46,717 psi | 72% | 2861 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 45,034 psi | 69% | 2848 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 32,547 psi | 50% | 2572 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 43,395 psi | 67% | 2841 fps | 96.3% |
| Norma 217 | <<locked>> | 98% | 36,767 psi | 57% | 2789 fps | 95.9% |
| Norma MRP | 78.3 gr | 80% | 35,056 psi | 54% | 2723 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 44,237 psi | 68% | 2867 fps | 99.7% |
| Ramshot Grand | <<locked>> | 88% | 42,627 psi | 66% | 2887 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 43,192 psi | 66% | 2854 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 38,087 psi | 59% | 2753 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,036 psi | 43% | 1844 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,708 psi | 83% | 3061 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,194 psi | 70% | 2894 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,613 psi | 67% | 2910 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,418 psi | 55% | 2759 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 47,108 psi | 73% | 2992 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 52,011 psi | 80% | 2953 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 44,541 psi | 69% | 2838 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 39,523 psi | 61% | 2772 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 47,761 psi | 74% | 2884 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,717 psi | 72% | 2861 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 45,034 psi | 69% | 2848 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,664 psi | 83% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,069 psi | 80% | 2838 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,818 psi | 71% | 2805 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,175 psi | 60% | 2766 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 51,880 psi | 80% | 2953 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,818 psi | 71% | 2822 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 41,162 psi | 63% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,362 psi | 57% | 2694 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 49,690 psi | 76% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,701 psi | 70% | 2861 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 37,115 psi | 57% | 2674 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 45,092 psi | 69% | 2861 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,766 psi | 55% | 2703 fps | 98.6% |
| Vihtavuori N560 | 86.1 gr | 88% | 47,398 psi | 73% | 2979 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 92% | 44,179 psi | 68% | 2890 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 98% | 48,153 psi | 74% | 3005 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,194 psi | 70% | 2818 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,978 psi | 72% | 2927 fps | 98.7% |
| Winchester StaBALL HD | 77.4 gr | 80% | 28,340 psi | 44% | 2615 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,508 psi | 61% | 2736 fps | 95.3% |
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 82 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Barnes TAC-X. Hodgdon Retumbo delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 2,001 fps to 3,196 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 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 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, Norma MRP, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Barnes TAC-X they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, IMR 8133 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.