Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Woodleigh HS bullet and 73 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 2700 | <<locked>> | 82% | 58,189 psi | 90% | 3005 fps | 99.7% |
| Accurate 3100 | <<locked>> | 92% | 55,317 psi | 85% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,825 psi | 86% | 3048 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,940 psi | 85% | 3097 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 90% | 56,985 psi | 88% | 3104 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 55,027 psi | 85% | 3104 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,214 psi | 82% | 3054 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,892 psi | 74% | 3012 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,797 psi | 87% | 3110 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,914 psi | 89% | 3117 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,405 psi | 87% | 3087 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,288 psi | 85% | 3100 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,507 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,420 psi | 87% | 3133 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,537 psi | 89% | 3159 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,623 psi | 87% | 3054 fps | 96.1% |
| Bofors RP15 | <<locked>> | 96% | 58,233 psi | 90% | 3143 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,405 psi | 87% | 3130 fps | 99% |
| Bofors RP5 | <<locked>> | 92% | 55,288 psi | 85% | 3100 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 57,653 psi | 89% | 3051 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 98% | 54,940 psi | 85% | 3087 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 57,392 psi | 88% | 3100 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 55,985 psi | 86% | 3058 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 58,523 psi | 90% | 3097 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,493 psi | 88% | 3084 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,029 psi | 88% | 3028 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,143 psi | 85% | 3199 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 58,697 psi | 90% | 3136 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,057 psi | 57% | 2018 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,028 psi | 86% | 3031 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,434 psi | 85% | 3018 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 56,217 psi | 87% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,550 psi | 85% | 3025 fps | 98% |
| IMR 7828 SSC | <<locked>> | 94% | 56,768 psi | 87% | 3136 fps | 98.7% |
| Lovex S065 | <<locked>> | 84% | 56,275 psi | 87% | 3018 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,160 psi | 90% | 3064 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,536 psi | 87% | 3028 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,363 psi | 88% | 3087 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 43,613 psi | 67% | 2936 fps | 98.4% |
| Norma MRP | <<locked>> | 90% | 55,100 psi | 85% | 3117 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 57,798 psi | 89% | 3084 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,943 psi | 89% | 3159 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 56,985 psi | 88% | 3087 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,826 psi | 87% | 3091 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,826 psi | 58% | 2060 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,057 psi | 86% | 3068 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,726 psi | 90% | 3153 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,710 psi | 87% | 3199 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,043 psi | 86% | 3143 fps | 98% |
| Rottweil R 904 | <<locked>> | 90% | 57,841 psi | 89% | 3071 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 90% | 56,072 psi | 86% | 3081 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 57,653 psi | 89% | 3051 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,275 psi | 87% | 3018 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,160 psi | 90% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,320 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,593 psi | 86% | 2966 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,651 psi | 86% | 3074 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 58,566 psi | 90% | 3048 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,014 psi | 86% | 2999 fps | 97.9% |
| Somchem S365 | <<locked>> | 86% | 54,969 psi | 85% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,594 psi | 87% | 3048 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 56,347 psi | 87% | 2963 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,825 psi | 86% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,333 psi | 87% | 3025 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,245 psi | 85% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,595 psi | 90% | 3104 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,781 psi | 84% | 3110 fps | 97.9% |
| Vihtavuori N565 | <<locked>> | 96% | 55,317 psi | 85% | 3087 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,492 psi | 87% | 3146 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,651 psi | 86% | 2972 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,580 psi | 89% | 3104 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,288 psi | 85% | 3153 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,652 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 2700 | <<locked>> | 80% | 54,462 psi | 84% | 2949 fps | 99.4% |
| Accurate 3100 | <<locked>> | 80% | 36,390 psi | 56% | 2661 fps | 97.2% |
| Accurate 4350 | <<locked>> | 80% | 48,515 psi | 75% | 2933 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 51,213 psi | 79% | 3031 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 40,321 psi | 62% | 2795 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 44,396 psi | 68% | 2907 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 94% | 43,149 psi | 66% | 2861 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 90% | 34,040 psi | 52% | 2687 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,311 psi | 71% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,954 psi | 83% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,379 psi | 62% | 2789 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,928 psi | 60% | 2785 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,867 psi | 54% | 2690 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,327 psi | 47% | 2585 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,812 psi | 60% | 2831 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,069 psi | 82% | 2992 fps | 95.2% |
| Bofors RP15 | <<locked>> | 84% | 38,725 psi | 60% | 2779 fps | 95.1% |
| Bofors RP30 | <<locked>> | 92% | 42,511 psi | 65% | 2877 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 38,928 psi | 60% | 2785 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 50,749 psi | 78% | 2940 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 41,249 psi | 63% | 2825 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 50,067 psi | 77% | 2982 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 52,330 psi | 81% | 2995 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 84% | 44,266 psi | 68% | 2848 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,528 psi | 72% | 2894 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,671 psi | 67% | 2818 fps | 100% |
| Hodgdon Retumbo | 86.1 gr | 88% | 38,870 psi | 60% | 2861 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 50,430 psi | 78% | 3005 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,659 psi | 43% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,137 psi | 71% | 2864 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,040 psi | 80% | 2966 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,006 psi | 71% | 2874 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,614 psi | 70% | 2848 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 42,801 psi | 66% | 2881 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 49,588 psi | 76% | 2910 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 47,877 psi | 74% | 2897 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 31,227 psi | 48% | 2533 fps | 95% |
| Norma 204 | <<locked>> | 80% | 46,383 psi | 71% | 2897 fps | 97.3% |
| Norma 217 | <<locked>> | 94% | 35,172 psi | 54% | 2740 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 38,203 psi | 59% | 2795 fps | 96.6% |
| Norma URP | <<locked>> | 80% | 47,253 psi | 73% | 2917 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 42,714 psi | 66% | 2887 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 46,296 psi | 71% | 2910 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,607 psi | 55% | 2690 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,413 psi | 44% | 1860 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,617 psi | 75% | 2949 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,949 psi | 72% | 2966 fps | 99.9% |
| ReloadSwiss RS 76 | 90.1 gr | 86% | 35,897 psi | 55% | 2769 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,776 psi | 74% | 2999 fps | 96% |
| Rottweil R 904 | <<locked>> | 82% | 44,396 psi | 68% | 2835 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 39,697 psi | 61% | 2772 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 50,749 psi | 78% | 2940 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,588 psi | 76% | 2910 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 47,877 psi | 74% | 2897 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,882 psi | 84% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,675 psi | 75% | 2858 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,363 psi | 61% | 2769 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 54,955 psi | 85% | 2995 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,542 psi | 70% | 2815 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 44,599 psi | 69% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,292 psi | 62% | 2753 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 80% | 52,634 psi | 81% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,776 psi | 75% | 2913 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,420 psi | 58% | 2677 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 48,298 psi | 74% | 2913 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 39,160 psi | 60% | 2772 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 84% | 44,150 psi | 68% | 2910 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 44,788 psi | 69% | 2900 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 96% | 48,660 psi | 75% | 3009 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,240 psi | 74% | 2864 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,227 psi | 77% | 2986 fps | 99.3% |
| Winchester StaBALL HD | 80.4 gr | 80% | 31,198 psi | 48% | 2700 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,740 psi | 61% | 2736 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 73 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Woodleigh HS. Hodgdon Retumbo delivers the highest muzzle velocity at 3,199 fps; across all powders the maximum-charge window runs from 2,018 fps to 3,199 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. Hodgdon Retumbo, Winchester StaBALL HD, ReloadSwiss RS 76 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 150gr | Woodleigh HS 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.