Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 165gr | Frontier BTSP 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, Winchester StaBALL HD and ReloadSwiss RS 76.
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>> | 92% | 55,259 psi | 85% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,854 psi | 86% | 2940 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,972 psi | 89% | 3054 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 56,913 psi | 88% | 2995 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 54,882 psi | 84% | 2995 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,214 psi | 82% | 2956 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,834 psi | 74% | 2917 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,782 psi | 87% | 2995 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,131 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,565 psi | 87% | 2982 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,158 psi | 85% | 2992 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,652 psi | 87% | 2966 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,217 psi | 87% | 3025 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,479 psi | 88% | 3054 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,449 psi | 87% | 2949 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 58,015 psi | 89% | 3035 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,275 psi | 87% | 3028 fps | 99.4% |
| Bofors RP5 | <<locked>> | 92% | 55,158 psi | 85% | 2992 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 57,711 psi | 89% | 2940 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 54,723 psi | 84% | 2982 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 57,609 psi | 89% | 2992 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,086 psi | 86% | 2949 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 58,595 psi | 90% | 2992 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,334 psi | 88% | 2976 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,159 psi | 88% | 2913 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,129 psi | 85% | 3097 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 58,537 psi | 90% | 3025 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,159 psi | 57% | 1916 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,159 psi | 86% | 2927 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,521 psi | 85% | 2910 fps | 99.9% |
| IMR 4831 | <<locked>> | 86% | 56,333 psi | 87% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,477 psi | 85% | 2920 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 94% | 56,753 psi | 87% | 3035 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,236 psi | 67% | 2818 fps | 96.8% |
| Lovex S065 | <<locked>> | 84% | 56,463 psi | 87% | 2910 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,262 psi | 90% | 2956 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,478 psi | 87% | 2920 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,421 psi | 88% | 2979 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 43,555 psi | 67% | 2844 fps | 98.9% |
| Norma MRP | <<locked>> | 90% | 55,201 psi | 85% | 3015 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,899 psi | 89% | 2972 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,783 psi | 89% | 3054 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 57,043 psi | 88% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,652 psi | 87% | 2986 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,000 psi | 58% | 1962 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,072 psi | 86% | 2956 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,624 psi | 90% | 3041 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,434 psi | 87% | 3091 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,869 psi | 86% | 3045 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 90% | 57,885 psi | 89% | 2963 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 55,956 psi | 86% | 2972 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 57,711 psi | 89% | 2940 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,463 psi | 87% | 2910 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,262 psi | 90% | 2956 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,494 psi | 90% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,579 psi | 86% | 2858 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,521 psi | 85% | 2966 fps | 99.5% |
| Somchem S361 | <<locked>> | 88% | 55,941 psi | 86% | 2894 fps | 98.4% |
| Somchem S365 | <<locked>> | 86% | 55,129 psi | 85% | 2923 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,666 psi | 87% | 2943 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 56,449 psi | 87% | 2851 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,854 psi | 86% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,260 psi | 87% | 2920 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 84% | 55,216 psi | 85% | 2917 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,552 psi | 90% | 2992 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,882 psi | 84% | 3009 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 96% | 55,230 psi | 85% | 2989 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,434 psi | 87% | 3048 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,622 psi | 86% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,609 psi | 89% | 2992 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,288 psi | 85% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,565 psi | 87% | 2936 fps | 99.6% |
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% | 36,564 psi | 56% | 2572 fps | 97.9% |
| Accurate 4350 | <<locked>> | 80% | 48,747 psi | 75% | 2831 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 43,395 psi | 67% | 2799 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 40,480 psi | 62% | 2703 fps | 96.5% |
| ADI AR 2213 | <<locked>> | 84% | 41,568 psi | 64% | 2749 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 92% | 40,364 psi | 62% | 2710 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 88% | 31,923 psi | 49% | 2546 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,325 psi | 71% | 2835 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,143 psi | 83% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,582 psi | 62% | 2697 fps | 96.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,448 psi | 56% | 2635 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,070 psi | 54% | 2602 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,458 psi | 47% | 2507 fps | 96.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,015 psi | 60% | 2743 fps | 99.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,069 psi | 82% | 2894 fps | 95.8% |
| Bofors RP15 | <<locked>> | 82% | 36,274 psi | 56% | 2628 fps | 95% |
| Bofors RP30 | <<locked>> | 90% | 39,653 psi | 61% | 2726 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 36,448 psi | 56% | 2635 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 50,792 psi | 78% | 2831 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 88% | 38,450 psi | 59% | 2674 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 50,270 psi | 77% | 2877 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 80% | 52,620 psi | 81% | 2894 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 84% | 44,411 psi | 68% | 2756 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,569 psi | 67% | 2740 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,859 psi | 68% | 2717 fps | 100% |
| Hodgdon Retumbo | 79.5 gr | 86% | 36,390 psi | 56% | 2710 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 50,488 psi | 78% | 2900 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,804 psi | 43% | 1722 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,296 psi | 71% | 2762 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,185 psi | 80% | 2854 fps | 99.7% |
| IMR 4831 | <<locked>> | 80% | 46,166 psi | 71% | 2772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 42,931 psi | 66% | 2697 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 84% | 40,045 psi | 62% | 2726 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,350 psi | 62% | 2756 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 49,792 psi | 77% | 2805 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 48,167 psi | 74% | 2799 fps | 99.5% |
| Lovex S071 | <<locked>> | 80% | 31,386 psi | 48% | 2448 fps | 96% |
| Norma 204 | <<locked>> | 80% | 46,644 psi | 72% | 2802 fps | 98% |
| Norma 217 | <<locked>> | 92% | 32,837 psi | 51% | 2595 fps | 95% |
| Norma MRP | <<locked>> | 80% | 38,363 psi | 59% | 2703 fps | 97.4% |
| Norma URP | <<locked>> | 80% | 47,558 psi | 73% | 2815 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 39,769 psi | 61% | 2730 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 46,557 psi | 72% | 2812 fps | 99.6% |
| Ramshot Magnum | <<locked>> | 84% | 35,679 psi | 55% | 2608 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 44% | 1762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,805 psi | 75% | 2848 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,079 psi | 72% | 2867 fps | 100% |
| ReloadSwiss RS 76 | 83.1 gr | 84% | 33,330 psi | 51% | 2618 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,048 psi | 68% | 2838 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 41,669 psi | 64% | 2680 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 39,842 psi | 61% | 2680 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 80% | 50,792 psi | 78% | 2831 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,792 psi | 77% | 2805 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 48,167 psi | 74% | 2799 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,056 psi | 85% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,675 psi | 75% | 2749 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,508 psi | 61% | 2677 fps | 96.4% |
| Somchem S361 | <<locked>> | 80% | 42,685 psi | 66% | 2667 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 44,759 psi | 69% | 2772 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,538 psi | 62% | 2667 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 80% | 52,939 psi | 81% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,023 psi | 75% | 2808 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,143 psi | 54% | 2536 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 48,428 psi | 75% | 2812 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,262 psi | 60% | 2677 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 44,280 psi | 68% | 2818 fps | 96% |
| Vihtavuori N565 | <<locked>> | 88% | 41,742 psi | 64% | 2746 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 94% | 45,179 psi | 70% | 2854 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,414 psi | 75% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,459 psi | 78% | 2881 fps | 99.6% |
| Winchester StaBALL HD | 76 gr | 80% | 31,459 psi | 48% | 2621 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,985 psi | 57% | 2585 fps | 95.4% |
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 77 powders for .300 Rem. Ultra Mag. loaded with the .308 | 165gr | Frontier BTSP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,097 fps; across all powders the maximum-charge window runs from 1,916 fps to 3,097 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 1:10.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 165gr | Frontier BTSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, IMR 7977 Enduron, Vihtavuori N170 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.