Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .307 | 150gr | Rhino Solid Shank bullet and 71 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 Vihtavuori N560.
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% | 55,985 psi | 86% | 3018 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,405 psi | 87% | 3058 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 54,752 psi | 84% | 3107 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 90% | 57,653 psi | 89% | 3117 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 92% | 55,666 psi | 86% | 3114 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,954 psi | 83% | 3068 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,573 psi | 75% | 3025 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,348 psi | 88% | 3117 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 58,697 psi | 90% | 3127 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,043 psi | 88% | 3100 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,941 psi | 86% | 3107 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,421 psi | 88% | 3084 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,290 psi | 88% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 58,508 psi | 90% | 3173 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,217 psi | 88% | 3064 fps | 96.4% |
| Bofors RP15 | <<locked>> | 94% | 55,129 psi | 85% | 3094 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,232 psi | 88% | 3143 fps | 99.2% |
| Bofors RP5 | <<locked>> | 92% | 55,941 psi | 86% | 3107 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 58,175 psi | 90% | 3061 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 98% | 55,521 psi | 85% | 3097 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 58,102 psi | 89% | 3110 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 56,492 psi | 87% | 3068 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 90% | 55,347 psi | 85% | 3051 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 58,073 psi | 89% | 3091 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,566 psi | 89% | 3035 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,999 psi | 86% | 3215 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 82% | 54,984 psi | 85% | 3081 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,028 psi | 57% | 2021 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,492 psi | 87% | 3041 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,912 psi | 86% | 3028 fps | 99.8% |
| IMR 4831 | <<locked>> | 86% | 56,724 psi | 87% | 3045 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,130 psi | 86% | 3035 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 94% | 57,638 psi | 89% | 3153 fps | 98.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,903 psi | 68% | 2920 fps | 96.3% |
| Lovex S065 | <<locked>> | 84% | 56,753 psi | 87% | 3028 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,085 psi | 85% | 3018 fps | 99.8% |
| Lovex S071 | <<locked>> | 98% | 57,377 psi | 88% | 3038 fps | 100% |
| Norma 204 | <<locked>> | 86% | 58,030 psi | 89% | 3097 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 44,382 psi | 68% | 2949 fps | 98.6% |
| Norma MRP | <<locked>> | 90% | 55,999 psi | 86% | 3130 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 58,537 psi | 90% | 3094 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,592 psi | 84% | 3107 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 86% | 57,653 psi | 89% | 3097 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,725 psi | 89% | 3100 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,956 psi | 58% | 2067 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,797 psi | 87% | 3077 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,172 psi | 85% | 3100 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 57,493 psi | 88% | 3205 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 57,072 psi | 88% | 3159 fps | 98.2% |
| Rottweil R 904 | <<locked>> | 90% | 58,479 psi | 90% | 3081 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 90% | 56,753 psi | 87% | 3091 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 58,175 psi | 90% | 3061 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,753 psi | 87% | 3028 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,085 psi | 85% | 3018 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,043 psi | 86% | 2976 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,318 psi | 87% | 3087 fps | 99.4% |
| Somchem S361 | <<locked>> | 88% | 56,536 psi | 87% | 3009 fps | 98.1% |
| Somchem S365 | <<locked>> | 86% | 55,550 psi | 85% | 3041 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,246 psi | 88% | 3058 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 56,855 psi | 88% | 2969 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,376 psi | 87% | 3028 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,116 psi | 88% | 3038 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 84% | 55,738 psi | 86% | 3035 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,593 psi | 86% | 3061 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,579 psi | 86% | 3123 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 96% | 56,130 psi | 86% | 3104 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,508 psi | 89% | 3159 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,260 psi | 87% | 2979 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 58,320 psi | 90% | 3117 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,362 psi | 87% | 3163 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,450 psi | 88% | 3054 fps | 99.4% |
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% | 36,854 psi | 57% | 2671 fps | 97.4% |
| Accurate 4350 | <<locked>> | 80% | 49,095 psi | 76% | 2946 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 47,282 psi | 73% | 2969 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 40,799 psi | 63% | 2805 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 86% | 44,962 psi | 69% | 2917 fps | 96% |
| ADI AR 2217 | <<locked>> | 92% | 40,828 psi | 63% | 2812 fps | 95% |
| ADI AR 2225 | <<locked>> | 90% | 34,505 psi | 53% | 2703 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,688 psi | 72% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,534 psi | 84% | 3068 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,828 psi | 63% | 2799 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 82% | 39,392 psi | 61% | 2795 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,375 psi | 54% | 2700 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,719 psi | 47% | 2595 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,508 psi | 61% | 2844 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 53,635 psi | 83% | 3002 fps | 95.5% |
| Bofors RP15 | <<locked>> | 84% | 39,175 psi | 60% | 2789 fps | 95.4% |
| Bofors RP30 | <<locked>> | 90% | 40,074 psi | 62% | 2825 fps | 95.1% |
| Bofors RP5 | <<locked>> | 82% | 39,392 psi | 61% | 2795 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 51,082 psi | 79% | 2946 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 41,756 psi | 64% | 2838 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 80% | 50,749 psi | 78% | 2992 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 53,011 psi | 82% | 3012 fps | 99% |
| Hodgdon H4831 | <<locked>> | 84% | 44,846 psi | 69% | 2861 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 84% | 43,932 psi | 68% | 2844 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,063 psi | 68% | 2825 fps | 100% |
| Hodgdon Retumbo | 85.1 gr | 86% | 36,898 psi | 57% | 2808 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 51,111 psi | 79% | 3015 fps | 99.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 43% | 1818 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,615 psi | 72% | 2874 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,533 psi | 81% | 2972 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,528 psi | 72% | 2884 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 46,195 psi | 71% | 2861 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 86% | 43,381 psi | 67% | 2894 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 98% | 40,973 psi | 63% | 2858 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 50,053 psi | 77% | 2920 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,385 psi | 74% | 2907 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 31,560 psi | 49% | 2539 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 47,050 psi | 72% | 2913 fps | 97.6% |
| Norma 217 | <<locked>> | 94% | 35,839 psi | 55% | 2756 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 38,682 psi | 60% | 2805 fps | 96.8% |
| Norma URP | <<locked>> | 80% | 47,805 psi | 74% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 43,337 psi | 67% | 2900 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 46,978 psi | 72% | 2920 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 36,143 psi | 56% | 2703 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,355 psi | 44% | 1860 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,342 psi | 76% | 2963 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,471 psi | 73% | 2976 fps | 99.9% |
| ReloadSwiss RS 76 | 88.9 gr | 84% | 33,794 psi | 52% | 2710 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 44,904 psi | 69% | 2940 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 42,032 psi | 65% | 2785 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 40,190 psi | 62% | 2785 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 51,082 psi | 79% | 2946 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,053 psi | 77% | 2920 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,385 psi | 74% | 2907 fps | 99.2% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,153 psi | 76% | 2864 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,856 psi | 61% | 2779 fps | 95.8% |
| Somchem S361 | <<locked>> | 82% | 46,050 psi | 71% | 2825 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 45,179 psi | 70% | 2884 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,901 psi | 63% | 2769 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 80% | 53,156 psi | 82% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,298 psi | 76% | 2920 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,971 psi | 58% | 2690 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 48,776 psi | 75% | 2923 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,682 psi | 61% | 2785 fps | 99.5% |
| Vihtavuori N560 | 86.2 gr | 84% | 44,802 psi | 69% | 2923 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 88% | 42,322 psi | 65% | 2848 fps | 95% |
| Vihtavuori N568 | <<locked>> | 96% | 49,603 psi | 76% | 3028 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,878 psi | 75% | 2871 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,749 psi | 78% | 2992 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,908 psi | 49% | 2717 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 40,176 psi | 62% | 2746 fps | 95.9% |
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 71 powders for .300 Rem. Ultra Mag. loaded with the .307 | 150gr | Rhino Solid Shank. Hodgdon Retumbo delivers the highest muzzle velocity at 3,215 fps; across all powders the maximum-charge window runs from 2,021 fps to 3,215 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 0.307" calls for a 1:16.5 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, Vihtavuori N560 rank at the top here: for .300 Rem. Ultra Mag. with the .307 | 150gr | Rhino Solid Shank 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.