Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 135gr | CutEdge ER Raptor bullet and 87 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Alliant Reloder-16.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 57,101 psi | 88% | 3117 fps | 98.9% |
| Accurate 3100 | <<locked>> | 98% | 57,551 psi | 89% | 3159 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 56,159 psi | 86% | 3104 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 58,755 psi | 90% | 3219 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,637 psi | 87% | 3248 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 84% | 56,478 psi | 87% | 3146 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,347 psi | 87% | 3209 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 98% | 58,088 psi | 89% | 3264 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,030 psi | 62% | 2940 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 57,551 psi | 89% | 3169 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,566 psi | 89% | 3192 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 55,666 psi | 86% | 3225 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,348 psi | 88% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,666 psi | 86% | 3192 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,667 psi | 89% | 3255 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3235 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,647 psi | 78% | 3163 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,434 psi | 85% | 3264 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,536 psi | 87% | 3235 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 58,726 psi | 90% | 3179 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 57,667 psi | 89% | 3255 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 57,914 psi | 89% | 3169 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,966 psi | 77% | 3100 fps | 97% |
| Hodgdon H380 | <<locked>> | 82% | 55,172 psi | 85% | 3143 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 57,043 psi | 88% | 3215 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 86% | 56,130 psi | 86% | 3176 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 96% | 58,030 psi | 89% | 3202 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,985 psi | 88% | 3186 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,173 psi | 86% | 3140 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,501 psi | 76% | 3209 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 88% | 58,218 psi | 90% | 3248 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 56% | 2090 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,724 psi | 86% | 3130 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 58,160 psi | 90% | 3159 fps | 99.5% |
| IMR 4350 | <<locked>> | 90% | 55,956 psi | 86% | 3146 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,927 psi | 86% | 3143 fps | 99.2% |
| IMR 4831 | <<locked>> | 90% | 55,405 psi | 85% | 3150 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,405 psi | 85% | 3130 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 98% | 55,463 psi | 85% | 3232 fps | 97.4% |
| Lovex S062 | <<locked>> | 82% | 55,825 psi | 86% | 3117 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,188 psi | 86% | 3136 fps | 99.8% |
| Lovex S070 | <<locked>> | 90% | 57,870 psi | 89% | 3179 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,024 psi | 79% | 3061 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 56,869 psi | 88% | 3176 fps | 100% |
| Norma 204 | <<locked>> | 90% | 57,072 psi | 88% | 3196 fps | 98.4% |
| Norma MRP | <<locked>> | 96% | 57,798 psi | 89% | 3284 fps | 99.6% |
| Norma URP | <<locked>> | 90% | 57,174 psi | 88% | 3205 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 58,479 psi | 90% | 3199 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,434 psi | 87% | 3251 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 90% | 56,275 psi | 87% | 3199 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,940 psi | 85% | 3179 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,086 psi | 57% | 2136 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,071 psi | 85% | 3123 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,724 psi | 87% | 3238 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,187 psi | 85% | 3179 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,928 psi | 89% | 3271 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,633 psi | 78% | 3209 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 57,711 psi | 89% | 3133 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 58,755 psi | 90% | 3176 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,595 psi | 89% | 3176 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 94% | 55,042 psi | 85% | 3179 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 57,914 psi | 89% | 3169 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,188 psi | 86% | 3136 fps | 99.8% |
| Shooters World Precision | <<locked>> | 82% | 55,825 psi | 86% | 3117 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,870 psi | 89% | 3179 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,014 psi | 88% | 3182 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,361 psi | 85% | 3009 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,724 psi | 86% | 3081 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 58,450 psi | 90% | 3235 fps | 98.8% |
| Somchem S355 | <<locked>> | 86% | 58,566 psi | 90% | 3173 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,840 psi | 86% | 3097 fps | 96.6% |
| Somchem S365 | <<locked>> | 92% | 57,406 psi | 88% | 3202 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,680 psi | 86% | 3150 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 58,305 psi | 90% | 3087 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 58,697 psi | 90% | 3100 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 56,260 psi | 87% | 3091 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,463 psi | 85% | 3140 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,230 psi | 85% | 3120 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 57,101 psi | 88% | 3094 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 58,465 psi | 90% | 3199 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,608 psi | 87% | 3205 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,696 psi | 89% | 3274 fps | 97.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,243 psi | 82% | 3169 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,622 psi | 86% | 3094 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,246 psi | 88% | 3219 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,173 psi | 86% | 3310 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,028 psi | 86% | 3143 fps | 98.4% |
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 2700 | <<locked>> | 80% | 53,359 psi | 82% | 3058 fps | 98.4% |
| Accurate 3100 | <<locked>> | 84% | 34,751 psi | 53% | 2730 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 52,591 psi | 81% | 3051 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,814 psi | 63% | 2907 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 94% | 52,475 psi | 81% | 3176 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 49,632 psi | 76% | 3035 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 45,600 psi | 70% | 3015 fps | 96% |
| ADI AR 2213 | <<locked>> | 94% | 50,444 psi | 78% | 3130 fps | 96% |
| ADI AR 2225 | <<locked>> | 98% | 37,304 psi | 57% | 2871 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,343 psi | 77% | 3058 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,751 psi | 83% | 3133 fps | 100% |
| Alliant Reloder-16 | 72.3 gr | 80% | 39,465 psi | 61% | 2923 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,803 psi | 70% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,366 psi | 65% | 2943 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 90% | 43,323 psi | 67% | 2995 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,892 psi | 44% | 2638 fps | 96.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 33,359 psi | 51% | 2776 fps | 95.3% |
| Alliant Reloder-26 | 79.8 gr | 80% | 31,546 psi | 49% | 2756 fps | 95.1% |
| Bofors RP15 | <<locked>> | 92% | 42,888 psi | 66% | 2982 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 51,169 psi | 79% | 3071 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 43,323 psi | 67% | 2995 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 44,454 psi | 68% | 2933 fps | 96.7% |
| Hodgdon H1000 | <<locked>> | 98% | 46,427 psi | 71% | 3031 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 51,474 psi | 79% | 3084 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 43,047 psi | 66% | 2963 fps | 96.9% |
| Hodgdon H4350 | <<locked>> | 80% | 45,832 psi | 71% | 2989 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 92% | 50,430 psi | 78% | 3071 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,313 psi | 76% | 3051 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,956 psi | 57% | 2802 fps | 99.1% |
| Hodgdon Retumbo | <<locked>> | 96% | 43,047 psi | 66% | 3068 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 42,554 psi | 65% | 2969 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,079 psi | 42% | 1880 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,185 psi | 80% | 3071 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,549 psi | 84% | 3104 fps | 99.1% |
| IMR 4350 | <<locked>> | 80% | 40,001 psi | 62% | 2844 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,050 psi | 71% | 2966 fps | 97.5% |
| IMR 4831 | <<locked>> | 80% | 39,189 psi | 60% | 2858 fps | 98.3% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,544 psi | 75% | 3009 fps | 95% |
| IMR 7828 SSC | <<locked>> | 94% | 48,138 psi | 74% | 3097 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 52,330 psi | 81% | 3064 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,250 psi | 67% | 2907 fps | 98.1% |
| Lovex S070 | <<locked>> | 80% | 41,510 psi | 64% | 2881 fps | 96.6% |
| Lovex S071 | <<locked>> | 90% | 36,172 psi | 56% | 2766 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 53,098 psi | 82% | 3117 fps | 100% |
| Norma 204 | <<locked>> | 84% | 46,122 psi | 71% | 3005 fps | 96% |
| Norma MRP | 83.3 gr | 86% | 39,624 psi | 61% | 2943 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 40,451 psi | 62% | 2904 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 80% | 54,418 psi | 84% | 3136 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 48,443 psi | 75% | 3110 fps | 96% |
| Ramshot Hunter | <<locked>> | 80% | 39,595 psi | 61% | 2887 fps | 96.8% |
| Ramshot Magnum | <<locked>> | 92% | 40,030 psi | 62% | 2897 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,572 psi | 42% | 1923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,285 psi | 79% | 3061 fps | 99% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,704 psi | 75% | 3120 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,046 psi | 63% | 2923 fps | 98.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,740 psi | 61% | 2936 fps | 98% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,202 psi | 57% | 2897 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 54,085 psi | 83% | 3081 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,848 psi | 74% | 3009 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 47,065 psi | 72% | 2992 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 88% | 44,454 psi | 68% | 2989 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 44,454 psi | 68% | 2933 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,250 psi | 67% | 2907 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 52,330 psi | 81% | 3064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,510 psi | 64% | 2881 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,661 psi | 76% | 3068 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,675 psi | 75% | 2913 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,453 psi | 65% | 2844 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 44,063 psi | 68% | 2979 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 47,964 psi | 74% | 3009 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 52,228 psi | 80% | 3041 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 37,057 psi | 57% | 2851 fps | 99.8% |
| Somchem S385 | <<locked>> | 84% | 39,291 psi | 60% | 2841 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 54,549 psi | 84% | 3038 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,853 psi | 84% | 3051 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,948 psi | 71% | 2930 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,901 psi | 64% | 2904 fps | 98.7% |
| Vihtavuori N165 | <<locked>> | 90% | 41,814 psi | 64% | 2877 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 53,403 psi | 82% | 3041 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,553 psi | 64% | 2900 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 80% | 32,242 psi | 50% | 2723 fps | 96.5% |
| Vihtavuori N560 | <<locked>> | 92% | 49,763 psi | 77% | 3136 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 98% | 49,487 psi | 76% | 3104 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,452 psi | 64% | 2864 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 43,207 psi | 66% | 2966 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,657 psi | 39% | 2598 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 90% | 44,918 psi | 69% | 2949 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 93 powders for .300 Rem. Ultra Mag. loaded with the .308 | 135gr | CutEdge ER Raptor. Winchester StaBALL HD delivers the highest muzzle velocity at 3,310 fps; across all powders the maximum-charge window runs from 2,090 fps to 3,310 fps. ADI AR 2217 gives the best case fill at 100 %, and 93 of the 93 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 135.0 gr projectile in 0.308" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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. Alliant Reloder-26, Norma MRP, Alliant Reloder-16 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 135gr | CutEdge ER Raptor they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Norma 217 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.