Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 136gr | Geco ZERO bullet and 82 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 ADI AR 2213.
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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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 3100 | <<locked>> | 96% | 55,927 psi | 86% | 3127 fps | 99.8% |
| Accurate 4064 | <<locked>> | 82% | 58,204 psi | 90% | 3120 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,913 psi | 88% | 3182 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 55,071 psi | 85% | 3215 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 58,001 psi | 89% | 3159 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 58,407 psi | 90% | 3235 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 56,289 psi | 87% | 3228 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,916 psi | 65% | 2979 fps | 97.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 58,595 psi | 90% | 3228 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,579 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 58,030 psi | 89% | 3248 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,434 psi | 85% | 3205 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,827 psi | 89% | 3219 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,072 psi | 86% | 3222 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 98% | 57,130 psi | 88% | 3202 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,924 psi | 81% | 3192 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 58,189 psi | 90% | 3287 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,013 psi | 85% | 3202 fps | 98.5% |
| Bofors RP3 | <<locked>> | 82% | 56,608 psi | 87% | 3143 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,776 psi | 75% | 3104 fps | 96.7% |
| Bofors RP5 | <<locked>> | 96% | 56,072 psi | 86% | 3222 fps | 98.7% |
| Bofors RP7 | <<locked>> | 86% | 55,912 psi | 86% | 3130 fps | 99.1% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,170 psi | 80% | 3136 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 82% | 56,942 psi | 88% | 3163 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,100 psi | 85% | 3176 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 86% | 57,986 psi | 89% | 3199 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 56,304 psi | 87% | 3166 fps | 97% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,056 psi | 85% | 3146 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 58,392 psi | 90% | 3163 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,895 psi | 80% | 3248 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 86% | 56,202 psi | 86% | 3209 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 56% | 2090 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,348 psi | 88% | 3143 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,696 psi | 89% | 3166 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,508 psi | 89% | 3159 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 57,334 psi | 88% | 3169 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,159 psi | 88% | 3153 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 98% | 57,870 psi | 89% | 3261 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 57,682 psi | 89% | 3133 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 58,001 psi | 89% | 3156 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,101 psi | 86% | 3146 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,258 psi | 82% | 3084 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 58,726 psi | 90% | 3192 fps | 100% |
| Norma 204 | <<locked>> | 88% | 55,129 psi | 85% | 3156 fps | 98.2% |
| Norma MRP | <<locked>> | 94% | 56,043 psi | 86% | 3245 fps | 99.5% |
| Norma URP | <<locked>> | 88% | 55,448 psi | 85% | 3166 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,665 psi | 84% | 3215 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 90% | 58,494 psi | 90% | 3222 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,769 psi | 89% | 3209 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 57% | 2136 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,681 psi | 87% | 3143 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,766 psi | 84% | 3199 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,334 psi | 88% | 3202 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,014 psi | 86% | 3232 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,084 psi | 82% | 3245 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 84% | 56,855 psi | 88% | 3140 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,825 psi | 86% | 3143 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 94% | 57,116 psi | 88% | 3205 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 86% | 55,912 psi | 86% | 3130 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 58,001 psi | 89% | 3156 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,682 psi | 89% | 3133 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,101 psi | 86% | 3146 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,998 psi | 85% | 3143 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,913 psi | 88% | 3018 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,638 psi | 89% | 3104 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,666 psi | 87% | 3199 fps | 98.7% |
| Somchem S355 | <<locked>> | 84% | 56,507 psi | 87% | 3136 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,885 psi | 89% | 3123 fps | 97.3% |
| Somchem S365 | <<locked>> | 90% | 55,695 psi | 86% | 3166 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,827 psi | 89% | 3176 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 86% | 58,204 psi | 90% | 3104 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,421 psi | 88% | 3159 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,508 psi | 89% | 3146 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 58,769 psi | 90% | 3107 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 56,637 psi | 87% | 3163 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,317 psi | 85% | 3176 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,869 psi | 86% | 3232 fps | 97.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,753 psi | 86% | 3199 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,711 psi | 89% | 3110 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,288 psi | 85% | 3179 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,984 psi | 85% | 3274 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 58,291 psi | 90% | 3169 fps | 98.9% |
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>> | 82% | 33,721 psi | 52% | 2697 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 54,375 psi | 84% | 3068 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 42,627 psi | 66% | 2936 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 92% | 50,923 psi | 78% | 3143 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 50,995 psi | 78% | 3051 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 44,092 psi | 68% | 2976 fps | 95.7% |
| ADI AR 2213 | 88.7 gr | 92% | 48,878 psi | 75% | 3094 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 96% | 36,390 psi | 56% | 2838 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 44,527 psi | 69% | 2979 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,996 psi | 80% | 3074 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,002 psi | 63% | 2949 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,718 psi | 73% | 3081 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 44,048 psi | 68% | 2969 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 42,148 psi | 65% | 2959 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,139 psi | 46% | 2664 fps | 97.2% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,401 psi | 50% | 2740 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,127 psi | 51% | 2792 fps | 96.2% |
| Bofors RP15 | <<locked>> | 90% | 41,684 psi | 64% | 2946 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 52,866 psi | 81% | 3084 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 45,353 psi | 70% | 3038 fps | 95.7% |
| Bofors RP5 | <<locked>> | 88% | 42,148 psi | 65% | 2959 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 45,876 psi | 71% | 2953 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 96% | 45,005 psi | 69% | 2995 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 53,040 psi | 82% | 3104 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 44,715 psi | 69% | 2989 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 80% | 47,311 psi | 73% | 3012 fps | 97% |
| Hodgdon H4831 | <<locked>> | 90% | 48,733 psi | 75% | 3035 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 51,314 psi | 79% | 3081 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,508 psi | 59% | 2825 fps | 99.4% |
| Hodgdon Retumbo | <<locked>> | 94% | 41,872 psi | 64% | 3031 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 44,469 psi | 68% | 2999 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 42% | 1883 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,606 psi | 83% | 3087 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,495 psi | 64% | 2871 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,442 psi | 73% | 2989 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 40,712 psi | 63% | 2881 fps | 98.8% |
| IMR 4955 Enduron | <<locked>> | 90% | 50,096 psi | 77% | 3031 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 46,717 psi | 72% | 3061 fps | 95.3% |
| Lovex S062 | <<locked>> | 80% | 53,983 psi | 83% | 3081 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,672 psi | 69% | 2927 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 42,931 psi | 66% | 2904 fps | 97.3% |
| Lovex S071 | <<locked>> | 88% | 35,172 psi | 54% | 2733 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 54,984 psi | 85% | 3136 fps | 100% |
| Norma 204 | <<locked>> | 82% | 44,454 psi | 68% | 2963 fps | 95.7% |
| Norma MRP | 83.6 gr | 84% | 38,464 psi | 59% | 2904 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 41,989 psi | 65% | 2927 fps | 98.9% |
| Ramshot Grand | <<locked>> | 92% | 46,934 psi | 72% | 3071 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 41,176 psi | 63% | 2910 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 90% | 38,856 psi | 60% | 2861 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,717 psi | 43% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,910 psi | 81% | 3084 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,705 psi | 78% | 3136 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,772 psi | 66% | 2949 fps | 98.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,249 psi | 63% | 2959 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 38,928 psi | 60% | 2936 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 49,530 psi | 76% | 3028 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 48,733 psi | 75% | 3018 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 86% | 43,250 psi | 67% | 2953 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 45,876 psi | 71% | 2953 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,672 psi | 69% | 2927 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 53,983 psi | 83% | 3081 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,931 psi | 66% | 2904 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,416 psi | 79% | 3087 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,067 psi | 77% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,787 psi | 67% | 2864 fps | 97.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 42,873 psi | 66% | 2946 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 49,574 psi | 76% | 3028 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 50,430 psi | 78% | 3002 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 38,856 psi | 60% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 40,901 psi | 63% | 2867 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 80% | 47,471 psi | 73% | 2946 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,569 psi | 67% | 2927 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 40,611 psi | 63% | 2848 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 54,897 psi | 84% | 3051 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,975 psi | 66% | 2923 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 33,750 psi | 52% | 2753 fps | 97.3% |
| Vihtavuori N560 | 89.5 gr | 90% | 48,225 psi | 74% | 3097 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 96% | 48,225 psi | 74% | 3068 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,076 psi | 66% | 2884 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,715 psi | 69% | 2989 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,774 psi | 41% | 2638 fps | 96.4% |
| Winchester Supreme 780 | <<locked>> | 88% | 43,482 psi | 67% | 2913 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 82 powders for .300 Rem. Ultra Mag. loaded with the .308 | 136gr | Geco ZERO. Alliant Reloder-26 delivers the highest muzzle velocity at 3,287 fps; across all powders the maximum-charge window runs from 2,090 fps to 3,287 fps. ADI AR 2225 gives the best case fill at 100 %, and 82 of the 82 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 136.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, 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. Norma MRP, Vihtavuori N560, ADI AR 2213 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 136gr | Geco ZERO 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.