Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .307 | 150gr | Rhino Penetrator bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 and Ramshot Grand.
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>> | 94% | 57,305 psi | 88% | 3038 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 58,030 psi | 89% | 3081 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,072 psi | 86% | 3127 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 82% | 58,146 psi | 89% | 3045 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 55,332 psi | 85% | 3077 fps | 99% |
| ADI AR 2213 | <<locked>> | 94% | 57,159 psi | 88% | 3136 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,532 psi | 79% | 3025 fps | 98% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,151 psi | 71% | 2979 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 58,740 psi | 90% | 3136 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,202 psi | 86% | 3094 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 58,537 psi | 90% | 3120 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 57,261 psi | 88% | 3133 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 58,436 psi | 90% | 3100 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 58,305 psi | 90% | 3163 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 55,303 psi | 85% | 3133 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 56,217 psi | 87% | 3114 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,230 psi | 83% | 3097 fps | 98.6% |
| Bofors RP5 | <<locked>> | 94% | 57,261 psi | 88% | 3133 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 56,376 psi | 87% | 3028 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 56,898 psi | 88% | 3117 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 55,869 psi | 86% | 3077 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 58,320 psi | 90% | 3091 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 56,811 psi | 87% | 3071 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,767 psi | 86% | 3054 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,405 psi | 85% | 3005 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,072 psi | 88% | 3235 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 56,840 psi | 87% | 3107 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,999 psi | 57% | 2008 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 58,262 psi | 90% | 3064 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,769 psi | 89% | 3051 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 58,421 psi | 90% | 3071 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,522 psi | 89% | 3054 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 94% | 54,940 psi | 85% | 3110 fps | 98.3% |
| Lovex S065 | <<locked>> | 86% | 58,407 psi | 90% | 3048 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,681 psi | 87% | 3041 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 58,595 psi | 90% | 3054 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,724 psi | 86% | 3061 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 41,814 psi | 64% | 2900 fps | 97.8% |
| Norma MRP | <<locked>> | 92% | 57,261 psi | 88% | 3153 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 56,188 psi | 86% | 3061 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 55,796 psi | 86% | 3127 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 86% | 55,376 psi | 85% | 3064 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,621 psi | 84% | 3058 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,782 psi | 58% | 2054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 58,305 psi | 90% | 3100 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,710 psi | 87% | 3127 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 58,755 psi | 90% | 3232 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,780 psi | 83% | 3107 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 82% | 57,740 psi | 89% | 3031 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,260 psi | 87% | 3045 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 58,218 psi | 90% | 3114 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 56,376 psi | 87% | 3028 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 58,407 psi | 90% | 3048 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,681 psi | 87% | 3041 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,101 psi | 88% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,928 psi | 89% | 2999 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,783 psi | 89% | 3107 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 57,116 psi | 88% | 3025 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 58,334 psi | 90% | 3028 fps | 98.2% |
| Somchem S365 | <<locked>> | 88% | 57,072 psi | 88% | 3064 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 58,798 psi | 90% | 3081 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 58,711 psi | 90% | 2992 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 58,015 psi | 89% | 3051 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 58,450 psi | 90% | 3054 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 57,392 psi | 88% | 3058 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,768 psi | 87% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 56,942 psi | 88% | 3143 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 98% | 57,203 psi | 88% | 3120 fps | 98.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,476 psi | 84% | 3114 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,972 psi | 89% | 3002 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 56,057 psi | 86% | 3077 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,203 psi | 88% | 3186 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,969 psi | 85% | 3015 fps | 99% |
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% | 35,157 psi | 54% | 2635 fps | 96.6% |
| Accurate 4350 | <<locked>> | 80% | 47,036 psi | 72% | 2907 fps | 99.9% |
| Accurate MAGPRO | 88.8 gr | 88% | 48,559 psi | 75% | 2992 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 54,694 psi | 84% | 2992 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,117 psi | 60% | 2769 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 86% | 43,105 psi | 66% | 2877 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 94% | 41,742 psi | 64% | 2828 fps | 95% |
| ADI AR 2225 | <<locked>> | 92% | 35,201 psi | 54% | 2723 fps | 95.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,759 psi | 69% | 2913 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,243 psi | 80% | 3035 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,175 psi | 60% | 2762 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 84% | 40,437 psi | 62% | 2822 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,750 psi | 52% | 2664 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 31,415 psi | 48% | 2621 fps | 95.8% |
| Alliant Reloder-26 | 81.6 gr | 80% | 37,333 psi | 57% | 2802 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 40,059 psi | 62% | 2808 fps | 95.5% |
| Bofors RP30 | <<locked>> | 92% | 40,814 psi | 63% | 2844 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 40,437 psi | 62% | 2822 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 49,400 psi | 76% | 2913 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 90% | 39,972 psi | 62% | 2795 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 48,675 psi | 75% | 2956 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 51,169 psi | 79% | 2976 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 46,050 psi | 71% | 2884 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 45,223 psi | 70% | 2867 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,409 psi | 65% | 2795 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,666 psi | 58% | 2831 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 48,849 psi | 75% | 2979 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,673 psi | 43% | 1804 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,889 psi | 69% | 2838 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,778 psi | 78% | 2940 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 44,628 psi | 69% | 2851 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,527 psi | 69% | 2825 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 88% | 44,469 psi | 68% | 2913 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 48,414 psi | 75% | 2890 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 46,760 psi | 72% | 2874 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 32,300 psi | 50% | 2562 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 45,150 psi | 69% | 2874 fps | 96.9% |
| Norma 217 | <<locked>> | 96% | 36,230 psi | 56% | 2769 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 36,825 psi | 57% | 2762 fps | 96% |
| Norma URP | <<locked>> | 80% | 46,021 psi | 71% | 2894 fps | 99.8% |
| Ramshot Grand | 84.5 gr | 86% | 41,394 psi | 64% | 2858 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 45,034 psi | 69% | 2884 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 37,014 psi | 57% | 2726 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,282 psi | 44% | 1847 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,268 psi | 73% | 2927 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,426 psi | 70% | 2940 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,592 psi | 53% | 2733 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 45,687 psi | 70% | 2959 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 53,983 psi | 83% | 2979 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,221 psi | 67% | 2808 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 38,595 psi | 59% | 2749 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 49,400 psi | 76% | 2913 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,414 psi | 75% | 2890 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 46,760 psi | 72% | 2874 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,621 psi | 83% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,442 psi | 73% | 2831 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,261 psi | 59% | 2743 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 53,693 psi | 83% | 2976 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 47,485 psi | 73% | 2851 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 43,091 psi | 66% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,247 psi | 60% | 2733 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 80% | 51,416 psi | 79% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,427 psi | 73% | 2887 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 38,870 psi | 60% | 2710 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 47,007 psi | 72% | 2890 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 37,768 psi | 58% | 2746 fps | 99.1% |
| Vihtavuori N560 | <<locked>> | 86% | 46,006 psi | 71% | 2949 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 90% | 43,163 psi | 66% | 2867 fps | 95% |
| Vihtavuori N568 | <<locked>> | 98% | 50,502 psi | 78% | 3045 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,905 psi | 72% | 2841 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,863 psi | 75% | 2959 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,095 psi | 46% | 2667 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,479 psi | 59% | 2710 fps | 95% |
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 .307 | 150gr | Rhino Penetrator. Hodgdon Retumbo delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,235 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 0.307" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Accurate MAGPRO, Alliant Reloder-26, Ramshot Grand rank at the top here: for .300 Rem. Ultra Mag. with the .307 | 150gr | Rhino Penetrator 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.