Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 165gr | Barnes TTSX BT bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Alliant Reloder-26 and Hodgdon Retumbo.
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% | 58,450 psi | 90% | 2949 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,201 psi | 85% | 2933 fps | 100% |
| Accurate High Country | <<locked>> | 90% | 56,318 psi | 87% | 3045 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 92% | 57,508 psi | 89% | 3048 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 56,521 psi | 87% | 2992 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 58,508 psi | 90% | 3051 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,620 psi | 81% | 2946 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,123 psi | 73% | 2904 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 56,608 psi | 87% | 2986 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,333 psi | 87% | 2989 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,551 psi | 89% | 2999 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,941 psi | 86% | 2979 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,581 psi | 90% | 3048 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,086 psi | 86% | 2959 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,898 psi | 86% | 3018 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,768 psi | 87% | 3045 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,188 psi | 86% | 2949 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 57,450 psi | 88% | 3028 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,506 psi | 85% | 3015 fps | 99.3% |
| Bofors RP5 | <<locked>> | 94% | 58,581 psi | 90% | 3048 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 57,130 psi | 88% | 2936 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,349 psi | 90% | 3038 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 57,000 psi | 88% | 2986 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,637 psi | 86% | 2943 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 58,131 psi | 89% | 2989 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,869 psi | 88% | 2972 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,565 psi | 87% | 2910 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,653 psi | 90% | 3153 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 58,044 psi | 89% | 3018 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,985 psi | 57% | 1919 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,651 psi | 86% | 2920 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,697 psi | 90% | 2959 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,651 psi | 86% | 2923 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,668 psi | 90% | 2969 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 94% | 56,289 psi | 87% | 3028 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,453 psi | 65% | 2802 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 55,854 psi | 86% | 2904 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,566 psi | 89% | 2949 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,637 psi | 86% | 2910 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,826 psi | 87% | 2976 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 42,728 psi | 66% | 2828 fps | 98.7% |
| Norma MRP | <<locked>> | 92% | 58,668 psi | 90% | 3068 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,290 psi | 88% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,450 psi | 88% | 3048 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 56,434 psi | 87% | 2972 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,159 psi | 86% | 2979 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 58% | 1962 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,492 psi | 85% | 2949 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,175 psi | 90% | 3035 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,898 psi | 86% | 3087 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,143 psi | 85% | 3035 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 82% | 58,653 psi | 90% | 2933 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,537 psi | 89% | 2959 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 55,492 psi | 85% | 2966 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 57,130 psi | 88% | 2936 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,854 psi | 86% | 2904 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,566 psi | 89% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,146 psi | 89% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 54,940 psi | 85% | 2851 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,071 psi | 85% | 2963 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 58,001 psi | 89% | 2923 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,434 psi | 85% | 2890 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 58,218 psi | 90% | 2966 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,840 psi | 86% | 2933 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 55,883 psi | 86% | 2848 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,448 psi | 85% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,898 psi | 86% | 2917 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 58,523 psi | 90% | 2966 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,856 psi | 89% | 2986 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,305 psi | 90% | 3064 fps | 99% |
| Vihtavuori N565 | <<locked>> | 98% | 58,436 psi | 90% | 3038 fps | 99.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,825 psi | 86% | 3038 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,216 psi | 85% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,203 psi | 88% | 2989 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,650 psi | 84% | 3035 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,014 psi | 86% | 2930 fps | 99.5% |
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% | 35,476 psi | 55% | 2552 fps | 97.6% |
| Accurate 4350 | <<locked>> | 80% | 47,732 psi | 73% | 2818 fps | 100% |
| Accurate High Country | 79.5 gr | 82% | 41,959 psi | 65% | 2785 fps | 95.9% |
| Accurate MAGPRO | <<locked>> | 86% | 46,122 psi | 71% | 2854 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 39,813 psi | 61% | 2690 fps | 96.3% |
| ADI AR 2213 | <<locked>> | 84% | 40,944 psi | 63% | 2740 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 92% | 39,784 psi | 61% | 2700 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 90% | 33,373 psi | 51% | 2592 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 40,205 psi | 62% | 2690 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,905 psi | 71% | 2828 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,577 psi | 82% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,842 psi | 61% | 2684 fps | 96.4% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,334 psi | 59% | 2680 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,272 psi | 53% | 2585 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,646 psi | 46% | 2484 fps | 95.9% |
| Alliant Reloder-26 | 79.9 gr | 80% | 38,174 psi | 59% | 2726 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,634 psi | 81% | 2887 fps | 95.8% |
| Bofors RP15 | <<locked>> | 84% | 38,130 psi | 59% | 2674 fps | 95.7% |
| Bofors RP30 | <<locked>> | 90% | 38,783 psi | 60% | 2710 fps | 95.4% |
| Bofors RP5 | <<locked>> | 82% | 38,334 psi | 59% | 2680 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 50,256 psi | 77% | 2825 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 88% | 37,884 psi | 58% | 2661 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 49,676 psi | 76% | 2871 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 52,170 psi | 80% | 2890 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 43,787 psi | 67% | 2746 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,989 psi | 66% | 2730 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,120 psi | 66% | 2707 fps | 100% |
| Hodgdon Retumbo | 80.4 gr | 86% | 35,795 psi | 55% | 2697 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 49,850 psi | 77% | 2894 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 43% | 1726 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,643 psi | 70% | 2753 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,793 psi | 80% | 2854 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,455 psi | 70% | 2766 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,395 psi | 65% | 2690 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 86% | 42,366 psi | 65% | 2779 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,566 psi | 61% | 2740 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 49,008 psi | 75% | 2799 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,369 psi | 73% | 2785 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 30,327 psi | 47% | 2425 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 46,079 psi | 71% | 2795 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 34,389 psi | 53% | 2638 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 37,623 psi | 58% | 2690 fps | 97.2% |
| Norma URP | <<locked>> | 80% | 46,804 psi | 72% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,218 psi | 60% | 2720 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 45,948 psi | 71% | 2802 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 34,969 psi | 54% | 2592 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 43% | 1762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,051 psi | 74% | 2838 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,499 psi | 72% | 2858 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 32,605 psi | 50% | 2595 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 43,352 psi | 67% | 2825 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 54,723 psi | 84% | 2881 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 41,147 psi | 63% | 2671 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 39,204 psi | 60% | 2671 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 80% | 50,256 psi | 77% | 2825 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,008 psi | 75% | 2799 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,369 psi | 73% | 2785 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,505 psi | 84% | 2759 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,095 psi | 74% | 2746 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,870 psi | 60% | 2664 fps | 96.2% |
| Somchem S355 | <<locked>> | 80% | 54,404 psi | 84% | 2874 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 42,032 psi | 65% | 2654 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 43,932 psi | 68% | 2759 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,784 psi | 61% | 2651 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 80% | 52,185 psi | 80% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,269 psi | 74% | 2799 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,330 psi | 53% | 2520 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 47,790 psi | 74% | 2805 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,406 psi | 59% | 2661 fps | 99.6% |
| Vihtavuori N560 | <<locked>> | 84% | 43,758 psi | 67% | 2812 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 88% | 40,973 psi | 63% | 2730 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 94% | 44,440 psi | 68% | 2838 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,848 psi | 74% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,864 psi | 77% | 2874 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,719 psi | 47% | 2602 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,318 psi | 56% | 2572 fps | 95.2% |
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 76 powders for .300 Rem. Ultra Mag. loaded with the .308 | 165gr | Barnes TTSX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,153 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 165.0 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, 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. Accurate High Country, Alliant Reloder-26, Hodgdon Retumbo rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 165gr | Barnes TTSX BT 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.