Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 168gr | Barnes TAC-TX BT bullet and 74 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 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% | 57,928 psi | 89% | 2923 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,769 psi | 90% | 2959 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,072 psi | 88% | 3022 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 90% | 56,144 psi | 86% | 2963 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 58,015 psi | 89% | 3025 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,272 psi | 80% | 2920 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,804 psi | 72% | 2881 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,159 psi | 86% | 2966 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,246 psi | 88% | 2972 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,738 psi | 86% | 2953 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,030 psi | 89% | 3018 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,492 psi | 85% | 2930 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,419 psi | 85% | 2992 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,231 psi | 87% | 3015 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,912 psi | 86% | 2923 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 57,174 psi | 88% | 3002 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,100 psi | 85% | 2992 fps | 99.3% |
| Bofors RP5 | <<locked>> | 94% | 58,030 psi | 89% | 3018 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 57,014 psi | 88% | 2910 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,001 psi | 89% | 3012 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 56,739 psi | 87% | 2959 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,477 psi | 85% | 2920 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 57,653 psi | 89% | 2959 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,579 psi | 87% | 2943 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,260 psi | 87% | 2884 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,233 psi | 90% | 3127 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,725 psi | 89% | 2992 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,014 psi | 57% | 1896 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,405 psi | 85% | 2894 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,581 psi | 90% | 2933 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,332 psi | 85% | 2897 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,363 psi | 90% | 2943 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 94% | 55,970 psi | 86% | 3002 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,076 psi | 65% | 2776 fps | 96.6% |
| Lovex S065 | <<locked>> | 84% | 55,506 psi | 85% | 2877 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 57,276 psi | 88% | 2923 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,303 psi | 85% | 2887 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,623 psi | 87% | 2949 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 42,337 psi | 65% | 2802 fps | 98.7% |
| Norma MRP | <<locked>> | 92% | 58,160 psi | 90% | 3038 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,971 psi | 88% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,000 psi | 88% | 3022 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 56,202 psi | 86% | 2946 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,535 psi | 85% | 2949 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,811 psi | 58% | 1942 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,042 psi | 85% | 2923 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,783 psi | 89% | 3009 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,390 psi | 85% | 3058 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,491 psi | 84% | 3005 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 82% | 58,233 psi | 90% | 2904 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,116 psi | 88% | 2933 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 55,056 psi | 85% | 2936 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 57,014 psi | 88% | 2910 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,506 psi | 85% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 57,276 psi | 88% | 2923 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,870 psi | 89% | 2779 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 58,552 psi | 90% | 2884 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 58,494 psi | 90% | 2992 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 57,812 psi | 89% | 2900 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,143 psi | 85% | 2864 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 57,972 psi | 89% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,680 psi | 86% | 2913 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 55,477 psi | 85% | 2822 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,114 psi | 85% | 2881 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,434 psi | 85% | 2890 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 58,073 psi | 89% | 2936 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 57,450 psi | 88% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,812 psi | 89% | 3035 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 98% | 58,059 psi | 89% | 3012 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,317 psi | 85% | 3012 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,853 psi | 84% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,942 psi | 88% | 2963 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,552 psi | 90% | 3068 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,724 psi | 86% | 2907 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% | 35,288 psi | 54% | 2530 fps | 97.6% |
| Accurate 4350 | <<locked>> | 80% | 47,485 psi | 73% | 2792 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 45,788 psi | 70% | 2828 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 39,624 psi | 61% | 2667 fps | 96.4% |
| ADI AR 2213 | <<locked>> | 84% | 40,698 psi | 63% | 2713 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 92% | 39,523 psi | 61% | 2677 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 90% | 33,127 psi | 51% | 2569 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,629 psi | 70% | 2802 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,258 psi | 82% | 2917 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,682 psi | 61% | 2661 fps | 96.4% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,174 psi | 59% | 2657 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,040 psi | 52% | 2562 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,486 psi | 45% | 2464 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,869 psi | 58% | 2700 fps | 99.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,489 psi | 81% | 2867 fps | 95.8% |
| Bofors RP15 | <<locked>> | 84% | 37,840 psi | 58% | 2651 fps | 95.8% |
| Bofors RP30 | <<locked>> | 90% | 38,595 psi | 59% | 2687 fps | 95.4% |
| Bofors RP5 | <<locked>> | 82% | 38,174 psi | 59% | 2657 fps | 96% |
| Bofors RP7 | <<locked>> | 80% | 50,038 psi | 77% | 2802 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 37,594 psi | 58% | 2635 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 49,342 psi | 76% | 2844 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 51,822 psi | 80% | 2861 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 43,555 psi | 67% | 2723 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,728 psi | 66% | 2707 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,859 psi | 66% | 2680 fps | 100% |
| Hodgdon Retumbo | 79 gr | 86% | 35,447 psi | 55% | 2667 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 49,632 psi | 76% | 2871 fps | 99.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 42% | 1703 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,455 psi | 70% | 2730 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,372 psi | 79% | 2825 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 45,107 psi | 69% | 2736 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,105 psi | 65% | 2664 fps | 95.4% |
| IMR 7828 SSC | 78.9 gr | 86% | 41,959 psi | 65% | 2753 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 98% | 39,160 psi | 60% | 2713 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 48,805 psi | 75% | 2772 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 47,166 psi | 73% | 2762 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 30,081 psi | 46% | 2402 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 45,788 psi | 70% | 2769 fps | 97.9% |
| Norma 217 | <<locked>> | 94% | 34,084 psi | 52% | 2615 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 37,333 psi | 57% | 2664 fps | 97.2% |
| Norma URP | <<locked>> | 80% | 46,572 psi | 72% | 2782 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 38,798 psi | 60% | 2690 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 45,614 psi | 70% | 2776 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 34,664 psi | 53% | 2569 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,224 psi | 43% | 1742 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,761 psi | 74% | 2812 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,209 psi | 71% | 2835 fps | 100% |
| ReloadSwiss RS 76 | 82.6 gr | 84% | 32,329 psi | 50% | 2572 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 42,873 psi | 66% | 2799 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 54,491 psi | 84% | 2854 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,959 psi | 63% | 2648 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 39,015 psi | 60% | 2648 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 80% | 50,038 psi | 77% | 2802 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,805 psi | 75% | 2772 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 47,166 psi | 73% | 2762 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,186 psi | 83% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,906 psi | 74% | 2720 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,682 psi | 60% | 2641 fps | 96.2% |
| Somchem S355 | <<locked>> | 80% | 54,157 psi | 83% | 2848 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,814 psi | 64% | 2631 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 43,714 psi | 67% | 2733 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,479 psi | 61% | 2628 fps | 97.4% |
| Vihtavuori N150 | <<locked>> | 80% | 51,953 psi | 80% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,037 psi | 74% | 2776 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,156 psi | 53% | 2497 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 47,456 psi | 73% | 2776 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,174 psi | 59% | 2638 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 43,352 psi | 67% | 2782 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 88% | 40,640 psi | 63% | 2703 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 94% | 44,063 psi | 68% | 2812 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,587 psi | 73% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,530 psi | 76% | 2848 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,356 psi | 47% | 2575 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,187 psi | 56% | 2549 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 74 powders for .300 Rem. Ultra Mag. loaded with the .308 | 168gr | Barnes TAC-TX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,127 fps; across all powders the maximum-charge window runs from 1,896 fps to 3,127 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 1:10.5 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. Hodgdon Retumbo, ReloadSwiss RS 76, IMR 7828 SSC rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 168gr | Barnes TAC-TX 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.