Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 168gr | Barnes TAC-X bullet and 72 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 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 2700 | <<locked>> | 82% | 58,465 psi | 90% | 2884 fps | 99.9% |
| Accurate 3100 | <<locked>> | 92% | 55,274 psi | 85% | 2887 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,072 psi | 86% | 2923 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,259 psi | 85% | 2986 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 90% | 57,392 psi | 88% | 2982 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 55,521 psi | 85% | 2989 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,679 psi | 83% | 2946 fps | 99.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,124 psi | 74% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,203 psi | 88% | 2982 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,450 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,956 psi | 88% | 2972 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,666 psi | 86% | 2982 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,014 psi | 88% | 2949 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,884 psi | 88% | 3012 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,073 psi | 89% | 3038 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,043 psi | 88% | 2946 fps | 97.1% |
| Bofors RP15 | <<locked>> | 96% | 58,581 psi | 90% | 3025 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,695 psi | 87% | 3015 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 55,666 psi | 86% | 2982 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 57,899 psi | 89% | 2927 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 55,230 psi | 85% | 2972 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 57,812 psi | 89% | 2979 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,391 psi | 87% | 2936 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 54,998 psi | 85% | 2923 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,899 psi | 89% | 2966 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,406 psi | 88% | 2900 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,724 psi | 86% | 3087 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,752 psi | 84% | 2953 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 57% | 1906 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,405 psi | 87% | 2910 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,825 psi | 86% | 2897 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,463 psi | 87% | 2913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,825 psi | 86% | 2910 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 94% | 57,450 psi | 88% | 3028 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,453 psi | 67% | 2802 fps | 97.1% |
| Lovex S065 | <<locked>> | 84% | 56,579 psi | 87% | 2894 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,523 psi | 90% | 2943 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,768 psi | 87% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,827 psi | 89% | 2969 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 43,830 psi | 67% | 2831 fps | 99.1% |
| Norma MRP | <<locked>> | 90% | 55,564 psi | 86% | 2999 fps | 100% |
| Norma URP | <<locked>> | 86% | 58,320 psi | 90% | 2959 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,508 psi | 90% | 3045 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 86% | 57,464 psi | 88% | 2966 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,145 psi | 88% | 2972 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,869 psi | 58% | 1949 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,391 psi | 87% | 2943 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,085 psi | 85% | 2972 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,174 psi | 88% | 3081 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,434 psi | 87% | 3035 fps | 98.7% |
| Rottweil R 904 | <<locked>> | 90% | 58,305 psi | 90% | 2953 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 56,333 psi | 87% | 2959 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 57,899 psi | 89% | 2927 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,579 psi | 87% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,523 psi | 90% | 2943 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,637 psi | 86% | 2844 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,912 psi | 86% | 2956 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 56,347 psi | 87% | 2887 fps | 98.6% |
| Somchem S365 | <<locked>> | 86% | 55,317 psi | 85% | 2907 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,884 psi | 88% | 2930 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 56,623 psi | 87% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,246 psi | 87% | 2897 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,710 psi | 87% | 2910 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 55,506 psi | 85% | 2904 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,056 psi | 85% | 2927 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,230 psi | 85% | 2995 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 96% | 55,593 psi | 86% | 2976 fps | 98.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,855 psi | 88% | 3035 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,985 psi | 86% | 2848 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,073 psi | 89% | 2982 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,811 psi | 86% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,072 psi | 88% | 2927 fps | 99.7% |
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 2700 | <<locked>> | 80% | 54,723 psi | 84% | 2831 fps | 99.8% |
| Accurate 3100 | <<locked>> | 80% | 36,129 psi | 56% | 2549 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 48,530 psi | 75% | 2808 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 47,819 psi | 74% | 2858 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 40,466 psi | 62% | 2684 fps | 96.7% |
| ADI AR 2213 | <<locked>> | 84% | 41,640 psi | 64% | 2736 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 92% | 40,437 psi | 62% | 2697 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 88% | 31,676 psi | 49% | 2530 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,688 psi | 72% | 2822 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,491 psi | 84% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,495 psi | 62% | 2680 fps | 96.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,434 psi | 56% | 2618 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,954 psi | 54% | 2582 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,182 psi | 46% | 2484 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,986 psi | 60% | 2723 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 50,067 psi | 77% | 2828 fps | 95.3% |
| Bofors RP15 | <<locked>> | 82% | 36,245 psi | 56% | 2612 fps | 95.2% |
| Bofors RP30 | <<locked>> | 90% | 39,711 psi | 61% | 2710 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 36,434 psi | 56% | 2618 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,937 psi | 78% | 2818 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 38,537 psi | 59% | 2661 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 50,430 psi | 78% | 2864 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 52,895 psi | 81% | 2884 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 41,408 psi | 64% | 2680 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,656 psi | 67% | 2723 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,845 psi | 67% | 2700 fps | 100% |
| Hodgdon Retumbo | 80.6 gr | 86% | 36,463 psi | 56% | 2697 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 80% | 50,865 psi | 78% | 2890 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1709 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,282 psi | 71% | 2746 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,460 psi | 81% | 2844 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 46,224 psi | 71% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 43,004 psi | 66% | 2684 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 84% | 40,074 psi | 62% | 2710 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 96% | 37,623 psi | 58% | 2677 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 49,676 psi | 76% | 2789 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,051 psi | 74% | 2779 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 30,922 psi | 48% | 2425 fps | 96% |
| Norma 204 | <<locked>> | 80% | 46,775 psi | 72% | 2789 fps | 98.2% |
| Norma 217 | <<locked>> | 92% | 32,692 psi | 50% | 2575 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 38,348 psi | 59% | 2687 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 47,543 psi | 73% | 2799 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,914 psi | 61% | 2717 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 46,673 psi | 72% | 2795 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 32,938 psi | 51% | 2523 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 44% | 1752 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,892 psi | 75% | 2831 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,297 psi | 73% | 2851 fps | 100% |
| ReloadSwiss RS 76 | 84.2 gr | 84% | 33,228 psi | 51% | 2598 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,222 psi | 68% | 2825 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 41,771 psi | 64% | 2667 fps | 96% |
| Rottweil R 905 | <<locked>> | 80% | 39,885 psi | 61% | 2667 fps | 96.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,937 psi | 78% | 2818 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,676 psi | 76% | 2789 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,051 psi | 74% | 2779 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,718 psi | 75% | 2740 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,552 psi | 61% | 2661 fps | 96.6% |
| Somchem S361 | <<locked>> | 80% | 42,670 psi | 66% | 2651 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 44,730 psi | 69% | 2753 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,451 psi | 62% | 2648 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 80% | 52,910 psi | 81% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,994 psi | 75% | 2792 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,925 psi | 54% | 2516 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,501 psi | 75% | 2795 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,131 psi | 60% | 2657 fps | 99.8% |
| Vihtavuori N560 | 79.7 gr | 82% | 41,307 psi | 64% | 2740 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 88% | 41,727 psi | 64% | 2726 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 94% | 45,455 psi | 70% | 2841 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,544 psi | 75% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,618 psi | 78% | 2867 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,531 psi | 49% | 2598 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,956 psi | 57% | 2569 fps | 95.7% |
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 72 powders for .300 Rem. Ultra Mag. loaded with the .308 | 168gr | Barnes TAC-X. Hodgdon Retumbo delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,087 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 168.0 gr projectile in 0.308" calls for a 1:12.0 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 168gr | Barnes TAC-X 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.