Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Sierra Pro-Hunter bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Hodgdon Retumbo 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% | 55,216 psi | 85% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,738 psi | 86% | 3048 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,986 psi | 89% | 3156 fps | 98% |
| ADI AR 2209 | <<locked>> | 90% | 56,869 psi | 88% | 3100 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 54,911 psi | 85% | 3100 fps | 98.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,171 psi | 82% | 3054 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,790 psi | 74% | 3012 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,666 psi | 87% | 3107 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,030 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,478 psi | 87% | 3091 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,201 psi | 85% | 3100 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,579 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,304 psi | 87% | 3130 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,406 psi | 88% | 3159 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,550 psi | 87% | 3051 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 58,117 psi | 89% | 3140 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,289 psi | 87% | 3127 fps | 99% |
| Bofors RP5 | <<locked>> | 92% | 55,201 psi | 85% | 3100 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 57,580 psi | 89% | 3048 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 54,839 psi | 84% | 3084 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 84% | 57,305 psi | 88% | 3097 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,883 psi | 86% | 3058 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 58,610 psi | 90% | 3097 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,377 psi | 88% | 3081 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,927 psi | 88% | 3025 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,274 psi | 85% | 3202 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 58,566 psi | 90% | 3133 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,101 psi | 57% | 2018 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,912 psi | 86% | 3028 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,317 psi | 85% | 3018 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 56,101 psi | 86% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,448 psi | 85% | 3022 fps | 98% |
| IMR 7828 SSC | <<locked>> | 94% | 56,652 psi | 87% | 3136 fps | 98.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,250 psi | 67% | 2904 fps | 96% |
| Lovex S065 | <<locked>> | 84% | 56,144 psi | 86% | 3018 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,233 psi | 90% | 3068 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,623 psi | 87% | 3028 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,246 psi | 88% | 3087 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 43,511 psi | 67% | 2930 fps | 98.3% |
| Norma MRP | <<locked>> | 90% | 55,172 psi | 85% | 3120 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 57,870 psi | 89% | 3087 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,812 psi | 89% | 3159 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 56,913 psi | 88% | 3087 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,710 psi | 87% | 3087 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,869 psi | 58% | 2064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,999 psi | 86% | 3064 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,595 psi | 90% | 3150 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,594 psi | 87% | 3196 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,941 psi | 86% | 3140 fps | 98% |
| Rottweil R 904 | <<locked>> | 90% | 57,725 psi | 89% | 3068 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 90% | 55,941 psi | 86% | 3077 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 57,580 psi | 89% | 3048 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,144 psi | 86% | 3018 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,233 psi | 90% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,218 psi | 90% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,463 psi | 85% | 2966 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,521 psi | 85% | 3071 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 58,465 psi | 90% | 3045 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,941 psi | 86% | 2995 fps | 97.9% |
| Somchem S365 | <<locked>> | 88% | 58,697 psi | 90% | 3084 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,507 psi | 87% | 3048 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 56,246 psi | 87% | 2963 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,709 psi | 86% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,231 psi | 87% | 3022 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,129 psi | 85% | 3025 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,465 psi | 90% | 3100 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,853 psi | 84% | 3110 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 96% | 55,201 psi | 85% | 3087 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,391 psi | 87% | 3143 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,535 psi | 85% | 2969 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,493 psi | 88% | 3104 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,187 psi | 85% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,536 psi | 87% | 3041 fps | 99.3% |
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% | 36,303 psi | 56% | 2657 fps | 97.1% |
| Accurate 4350 | <<locked>> | 80% | 48,428 psi | 75% | 2933 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,557 psi | 72% | 2953 fps | 95.2% |
| ADI AR 2209 | <<locked>> | 80% | 40,263 psi | 62% | 2792 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 44,454 psi | 68% | 2907 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 94% | 43,062 psi | 66% | 2861 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 90% | 33,968 psi | 52% | 2687 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,180 psi | 71% | 2940 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,853 psi | 83% | 3058 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,306 psi | 62% | 2789 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,841 psi | 60% | 2782 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,780 psi | 54% | 2687 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,269 psi | 47% | 2582 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,870 psi | 60% | 2831 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,127 psi | 82% | 2992 fps | 95.2% |
| Bofors RP15 | <<locked>> | 84% | 38,638 psi | 59% | 2776 fps | 95.1% |
| Bofors RP30 | <<locked>> | 92% | 42,424 psi | 65% | 2874 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 38,841 psi | 60% | 2782 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 50,647 psi | 78% | 2936 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 41,176 psi | 63% | 2825 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 50,125 psi | 77% | 2982 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 52,388 psi | 81% | 2999 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 47,427 psi | 73% | 2910 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,586 psi | 72% | 2894 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,569 psi | 67% | 2815 fps | 100% |
| Hodgdon Retumbo | 86.1 gr | 88% | 38,928 psi | 60% | 2864 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 50,372 psi | 78% | 3002 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,702 psi | 43% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,035 psi | 71% | 2861 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,982 psi | 80% | 2963 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 45,919 psi | 71% | 2874 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,658 psi | 70% | 2851 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 42,728 psi | 66% | 2881 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,335 psi | 62% | 2841 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 49,472 psi | 76% | 2910 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 47,979 psi | 74% | 2897 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 31,154 psi | 48% | 2530 fps | 95% |
| Norma 204 | <<locked>> | 80% | 46,485 psi | 72% | 2900 fps | 97.4% |
| Norma 217 | <<locked>> | 94% | 35,244 psi | 54% | 2743 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 38,116 psi | 59% | 2792 fps | 96.6% |
| Norma URP | <<locked>> | 80% | 47,311 psi | 73% | 2917 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 42,772 psi | 66% | 2887 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 46,383 psi | 71% | 2910 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,549 psi | 55% | 2690 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 44% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,544 psi | 75% | 2949 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,876 psi | 72% | 2966 fps | 99.9% |
| ReloadSwiss RS 76 | 90 gr | 86% | 35,824 psi | 55% | 2766 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,674 psi | 73% | 2999 fps | 96% |
| Rottweil R 904 | <<locked>> | 82% | 44,309 psi | 68% | 2831 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 39,624 psi | 61% | 2772 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 50,647 psi | 78% | 2936 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,472 psi | 76% | 2910 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 47,979 psi | 74% | 2897 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,752 psi | 84% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,573 psi | 75% | 2854 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,291 psi | 60% | 2766 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 54,868 psi | 84% | 2992 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,600 psi | 70% | 2818 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 44,469 psi | 68% | 2871 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,350 psi | 62% | 2756 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 80% | 52,707 psi | 81% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,704 psi | 75% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,463 psi | 58% | 2680 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 48,182 psi | 74% | 2913 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 39,059 psi | 60% | 2769 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 84% | 44,208 psi | 68% | 2913 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 44,701 psi | 69% | 2897 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 48,747 psi | 75% | 3012 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,167 psi | 74% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,125 psi | 77% | 2982 fps | 99.3% |
| Winchester StaBALL HD | 80.4 gr | 80% | 31,227 psi | 48% | 2703 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,682 psi | 61% | 2733 fps | 95.6% |
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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Sierra Pro-Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,202 fps; across all powders the maximum-charge window runs from 2,018 fps to 3,202 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 1:15.5 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. Winchester StaBALL HD, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Sierra Pro-Hunter 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.