Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 150gr | Woodleigh PP SN 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 3100 | <<locked>> | 92% | 55,405 psi | 85% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,927 psi | 86% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 58,320 psi | 90% | 3163 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 90% | 57,058 psi | 88% | 3104 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 92% | 55,085 psi | 85% | 3104 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,447 psi | 82% | 3058 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,109 psi | 74% | 3015 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,869 psi | 88% | 3110 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,218 psi | 90% | 3120 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,637 psi | 87% | 3094 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,390 psi | 85% | 3100 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,753 psi | 87% | 3074 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,666 psi | 87% | 3136 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,841 psi | 89% | 3163 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,811 psi | 87% | 3054 fps | 96.2% |
| Bofors RP15 | <<locked>> | 96% | 58,262 psi | 90% | 3143 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,666 psi | 87% | 3133 fps | 99.1% |
| Bofors RP5 | <<locked>> | 92% | 55,390 psi | 85% | 3100 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 57,754 psi | 89% | 3054 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 54,998 psi | 85% | 3087 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 84% | 57,653 psi | 89% | 3107 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,246 psi | 87% | 3061 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 58,740 psi | 90% | 3100 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,537 psi | 89% | 3084 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,116 psi | 88% | 3028 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,405 psi | 85% | 3205 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,592 psi | 84% | 3074 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 57% | 2018 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,115 psi | 86% | 3031 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,535 psi | 85% | 3022 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 56,289 psi | 87% | 3041 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,608 psi | 86% | 3025 fps | 98% |
| IMR 7828 SSC | <<locked>> | 94% | 57,058 psi | 88% | 3143 fps | 98.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,410 psi | 67% | 2910 fps | 96.1% |
| Lovex S065 | <<locked>> | 84% | 56,507 psi | 87% | 3022 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,436 psi | 90% | 3071 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,768 psi | 87% | 3031 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,406 psi | 88% | 3091 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 43,830 psi | 67% | 2940 fps | 98.4% |
| Norma MRP | <<locked>> | 90% | 55,390 psi | 85% | 3120 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 58,102 psi | 89% | 3091 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 58,247 psi | 90% | 3163 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 57,072 psi | 88% | 3091 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,101 psi | 88% | 3094 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,826 psi | 58% | 2064 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,347 psi | 87% | 3071 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,737 psi | 84% | 3097 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,942 psi | 88% | 3199 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,275 psi | 87% | 3146 fps | 98% |
| Rottweil R 904 | <<locked>> | 90% | 58,102 psi | 89% | 3074 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 90% | 56,115 psi | 86% | 3081 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 57,754 psi | 89% | 3054 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,507 psi | 87% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,436 psi | 90% | 3071 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,436 psi | 90% | 2920 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,651 psi | 86% | 2969 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,695 psi | 86% | 3074 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 58,668 psi | 90% | 3048 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,072 psi | 86% | 2999 fps | 98% |
| Somchem S365 | <<locked>> | 86% | 55,085 psi | 85% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,869 psi | 88% | 3051 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 82% | 56,434 psi | 87% | 2966 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,927 psi | 86% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,550 psi | 87% | 3028 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 84% | 55,332 psi | 85% | 3028 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,143 psi | 85% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,027 psi | 85% | 3114 fps | 98% |
| Vihtavuori N565 | <<locked>> | 96% | 55,579 psi | 86% | 3091 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,739 psi | 87% | 3150 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,869 psi | 86% | 2976 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,841 psi | 89% | 3107 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,622 psi | 86% | 3156 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,869 psi | 88% | 3045 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% | 36,463 psi | 56% | 2661 fps | 97.2% |
| Accurate 4350 | <<locked>> | 80% | 48,646 psi | 75% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 46,891 psi | 72% | 2959 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 40,422 psi | 62% | 2799 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 44,614 psi | 69% | 2910 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 94% | 43,352 psi | 67% | 2867 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 90% | 34,229 psi | 53% | 2697 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,398 psi | 71% | 2943 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,244 psi | 83% | 3064 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,480 psi | 62% | 2792 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 82% | 39,160 psi | 60% | 2789 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,969 psi | 54% | 2690 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,414 psi | 47% | 2589 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,088 psi | 60% | 2838 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,229 psi | 82% | 2995 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 38,798 psi | 60% | 2779 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 42,598 psi | 66% | 2877 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 39,160 psi | 60% | 2789 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 50,836 psi | 78% | 2940 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 41,437 psi | 64% | 2828 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 50,314 psi | 77% | 2986 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 52,620 psi | 81% | 3002 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 84% | 44,498 psi | 68% | 2854 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,775 psi | 72% | 2900 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,772 psi | 67% | 2822 fps | 100% |
| Hodgdon Retumbo | 86.4 gr | 88% | 39,088 psi | 60% | 2867 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 80% | 50,546 psi | 78% | 3005 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,702 psi | 43% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,195 psi | 71% | 2864 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,156 psi | 80% | 2966 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,122 psi | 71% | 2877 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,847 psi | 71% | 2854 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 43,033 psi | 66% | 2884 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,480 psi | 62% | 2844 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 49,661 psi | 76% | 2913 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,167 psi | 74% | 2904 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 31,328 psi | 48% | 2536 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 46,644 psi | 72% | 2904 fps | 97.4% |
| Norma 217 | <<locked>> | 94% | 35,360 psi | 54% | 2746 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 38,319 psi | 59% | 2799 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 47,543 psi | 73% | 2923 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 42,960 psi | 66% | 2890 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 46,557 psi | 72% | 2913 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,824 psi | 55% | 2697 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,311 psi | 44% | 1857 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,907 psi | 75% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,050 psi | 72% | 2969 fps | 99.9% |
| ReloadSwiss RS 76 | 90.4 gr | 86% | 36,085 psi | 56% | 2776 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,993 psi | 74% | 3005 fps | 96.1% |
| Rottweil R 904 | <<locked>> | 82% | 44,628 psi | 69% | 2841 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 80% | 39,798 psi | 61% | 2776 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,836 psi | 78% | 2940 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,661 psi | 76% | 2913 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,167 psi | 74% | 2904 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,969 psi | 85% | 2874 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,747 psi | 75% | 2858 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,465 psi | 61% | 2772 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 55,085 psi | 85% | 2995 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,745 psi | 70% | 2822 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 44,686 psi | 69% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,509 psi | 62% | 2759 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 52,910 psi | 81% | 2917 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,892 psi | 75% | 2913 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,608 psi | 58% | 2684 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,385 psi | 74% | 2917 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,247 psi | 60% | 2776 fps | 99.5% |
| Vihtavuori N560 | <<locked>> | 84% | 44,382 psi | 68% | 2917 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 45,049 psi | 69% | 2904 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 96% | 48,907 psi | 75% | 3012 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,486 psi | 75% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,488 psi | 78% | 2989 fps | 99.4% |
| Winchester StaBALL HD | 80.7 gr | 80% | 31,473 psi | 48% | 2707 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,827 psi | 61% | 2740 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 78 powders for .300 Rem. Ultra Mag. loaded with the .308 | 150gr | Woodleigh PP SN. Hodgdon Retumbo delivers the highest muzzle velocity at 3,205 fps; across all powders the maximum-charge window runs from 2,018 fps to 3,205 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 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 | 150gr | Woodleigh PP SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-33, IMR 7977 Enduron 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.