Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 134gr | CutEdge ESP 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 Norma MRP, Vihtavuori N560 and ReloadSwiss RS 70.
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 2495 | <<locked>> | 82% | 58,117 psi | 89% | 3087 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 55,811 psi | 86% | 3104 fps | 98.6% |
| Accurate 3100 | <<locked>> | 98% | 56,014 psi | 86% | 3143 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 55,013 psi | 85% | 3094 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,232 psi | 88% | 3205 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 55,332 psi | 85% | 3133 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 58,769 psi | 90% | 3255 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 56,695 psi | 87% | 3245 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,318 psi | 87% | 3156 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,333 psi | 87% | 3179 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 58,073 psi | 89% | 3268 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,825 psi | 86% | 3232 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 58,160 psi | 90% | 3238 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,144 psi | 86% | 3238 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 56,724 psi | 87% | 3219 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,081 psi | 76% | 3143 fps | 99.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 57,870 psi | 89% | 3307 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,810 psi | 84% | 3215 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 57,435 psi | 88% | 3173 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 56,144 psi | 86% | 3238 fps | 98.4% |
| Bofors RP7 | <<locked>> | 88% | 56,608 psi | 87% | 3156 fps | 98.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,573 psi | 75% | 3077 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 84% | 57,725 psi | 89% | 3189 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,666 psi | 86% | 3202 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 88% | 58,523 psi | 90% | 3219 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 96% | 56,623 psi | 87% | 3182 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 55,347 psi | 85% | 3163 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 58,436 psi | 90% | 3179 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,993 psi | 74% | 3182 fps | 97.7% |
| Hodgdon Superformance | <<locked>> | 88% | 56,681 psi | 87% | 3232 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,230 psi | 56% | 2087 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,233 psi | 90% | 3173 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,043 psi | 88% | 3150 fps | 99.2% |
| IMR 4350 | <<locked>> | 92% | 58,392 psi | 90% | 3186 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,320 psi | 90% | 3186 fps | 99.4% |
| IMR 4831 | <<locked>> | 92% | 57,798 psi | 89% | 3196 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,841 psi | 89% | 3212 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,754 psi | 89% | 3173 fps | 97% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 57,986 psi | 89% | 3278 fps | 97.7% |
| Lovex S062 | <<locked>> | 84% | 58,305 psi | 90% | 3159 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 58,595 psi | 90% | 3176 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 56,594 psi | 87% | 3166 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,545 psi | 76% | 3041 fps | 99% |
| Norma 203B | <<locked>> | 82% | 55,651 psi | 86% | 3163 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,782 psi | 86% | 3182 fps | 98% |
| Norma MRP | <<locked>> | 96% | 55,985 psi | 86% | 3264 fps | 99.3% |
| Norma URP | <<locked>> | 90% | 55,738 psi | 86% | 3189 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,072 psi | 88% | 3186 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,723 psi | 84% | 3225 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 90% | 54,955 psi | 85% | 3186 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,272 psi | 82% | 3159 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,883 psi | 57% | 2133 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,580 psi | 89% | 3169 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,100 psi | 85% | 3225 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,580 psi | 89% | 3222 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,101 psi | 86% | 3251 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,008 psi | 75% | 3179 fps | 98.9% |
| Rottweil R 902 | <<locked>> | 82% | 56,449 psi | 87% | 3123 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,493 psi | 88% | 3166 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,159 psi | 86% | 3159 fps | 97.2% |
| Rottweil R 905 | <<locked>> | 96% | 57,348 psi | 88% | 3222 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 88% | 56,608 psi | 87% | 3156 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 58,595 psi | 90% | 3176 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 58,305 psi | 90% | 3159 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,594 psi | 87% | 3166 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,622 psi | 86% | 3169 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,957 psi | 89% | 3048 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 58,479 psi | 90% | 3127 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,869 psi | 88% | 3215 fps | 98.5% |
| Somchem S355 | <<locked>> | 86% | 57,116 psi | 88% | 3159 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 58,465 psi | 90% | 3143 fps | 97% |
| Somchem S365 | <<locked>> | 92% | 55,883 psi | 86% | 3192 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 58,015 psi | 89% | 3192 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 56,956 psi | 88% | 3077 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,493 psi | 88% | 3091 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,129 psi | 85% | 3081 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,885 psi | 89% | 3182 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 57,682 psi | 89% | 3163 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 55,767 psi | 86% | 3081 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,188 psi | 88% | 3186 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,158 psi | 85% | 3192 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 55,970 psi | 86% | 3251 fps | 96.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,590 psi | 79% | 3146 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 58,189 psi | 90% | 3133 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,666 psi | 86% | 3202 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,954 psi | 83% | 3291 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 58,624 psi | 90% | 3186 fps | 98.6% |
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 2495 | <<locked>> | 80% | 54,230 psi | 83% | 3038 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,083 psi | 80% | 3041 fps | 98% |
| Accurate 3100 | <<locked>> | 86% | 36,158 psi | 56% | 2772 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 51,445 psi | 79% | 3041 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,784 psi | 61% | 2894 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 80% | 48,501 psi | 75% | 3022 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 44,411 psi | 68% | 2995 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 94% | 49,124 psi | 76% | 3110 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,313 psi | 76% | 3045 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,721 psi | 81% | 3120 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,537 psi | 59% | 2907 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,411 psi | 68% | 3041 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 44,295 psi | 68% | 2989 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 92% | 45,179 psi | 70% | 3038 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,123 psi | 43% | 2618 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 90% | 34,679 psi | 53% | 2818 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 82% | 33,054 psi | 51% | 2808 fps | 95.7% |
| Bofors RP15 | <<locked>> | 94% | 44,541 psi | 69% | 3025 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 49,922 psi | 77% | 3054 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 45,179 psi | 70% | 3038 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 43,424 psi | 67% | 2913 fps | 96.2% |
| Hodgdon H1000 | <<locked>> | 98% | 45,237 psi | 70% | 3009 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 50,299 psi | 77% | 3071 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 41,945 psi | 65% | 2946 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 44,759 psi | 69% | 2972 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 94% | 52,620 psi | 81% | 3117 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 51,619 psi | 79% | 3097 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,984 psi | 55% | 2789 fps | 98.7% |
| Hodgdon Retumbo | <<locked>> | 96% | 41,698 psi | 64% | 3038 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 41,336 psi | 64% | 2949 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 42% | 1880 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,966 psi | 78% | 3061 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,505 psi | 82% | 3091 fps | 98.8% |
| IMR 4350 | <<locked>> | 82% | 41,901 psi | 64% | 2890 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,005 psi | 69% | 2949 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 38,101 psi | 59% | 2838 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 54,128 psi | 83% | 3153 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 50,676 psi | 78% | 3054 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 96% | 50,183 psi | 77% | 3140 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 51,285 psi | 79% | 3054 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,337 psi | 65% | 2894 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 40,640 psi | 63% | 2867 fps | 96.2% |
| Lovex S071 | <<locked>> | 90% | 34,998 psi | 54% | 2743 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 52,098 psi | 80% | 3107 fps | 100% |
| Norma 204 | <<locked>> | 84% | 44,904 psi | 69% | 2986 fps | 95.3% |
| Norma MRP | 81.9 gr | 86% | 38,435 psi | 59% | 2920 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 39,465 psi | 61% | 2887 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 80% | 53,026 psi | 82% | 3123 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 46,891 psi | 72% | 3081 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 38,421 psi | 59% | 2864 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 94% | 41,974 psi | 65% | 2946 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,528 psi | 42% | 1923 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,198 psi | 77% | 3048 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,195 psi | 73% | 3104 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,943 psi | 61% | 2907 fps | 98% |
| ReloadSwiss RS 70 | 77.7 gr | 80% | 38,595 psi | 59% | 2913 fps | 97.5% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 38,914 psi | 60% | 2949 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 53,055 psi | 82% | 3071 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,833 psi | 72% | 2999 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 49,124 psi | 76% | 3038 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 88% | 43,366 psi | 67% | 2969 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 43,424 psi | 67% | 2913 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,337 psi | 65% | 2894 fps | 97.7% |
| Shooters World Precision | <<locked>> | 80% | 51,285 psi | 79% | 3054 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,640 psi | 63% | 2867 fps | 96.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,327 psi | 74% | 3051 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,718 psi | 73% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,466 psi | 64% | 2828 fps | 96.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 42,989 psi | 66% | 2963 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 46,963 psi | 72% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 50,807 psi | 78% | 3018 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 36,013 psi | 55% | 2838 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 41,002 psi | 63% | 2884 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 53,388 psi | 82% | 3028 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,853 psi | 83% | 3041 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,976 psi | 69% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,944 psi | 63% | 2887 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 90% | 40,698 psi | 63% | 2861 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 52,286 psi | 80% | 3031 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,509 psi | 62% | 2887 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 31,183 psi | 48% | 2703 fps | 95.8% |
| Vihtavuori N560 | 89.5 gr | 94% | 52,025 psi | 80% | 3182 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 98% | 47,906 psi | 74% | 3077 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,350 psi | 62% | 2851 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 42,119 psi | 65% | 2949 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,687 psi | 41% | 2644 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 90% | 43,801 psi | 67% | 2933 fps | 95.3% |
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 95 powders for .300 Rem. Ultra Mag. loaded with the .308 | 134gr | CutEdge ESP Raptor. Alliant Reloder-26 delivers the highest muzzle velocity at 3,307 fps; across all powders the maximum-charge window runs from 2,087 fps to 3,307 fps. ADI AR 2217 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 134.0 gr projectile in 0.308" calls for a 1:9.5 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. Norma MRP, Vihtavuori N560, ReloadSwiss RS 70 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 134gr | CutEdge ESP 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.