Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 123gr | Nosler Expansion Tip 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, Alliant Reloder-16 and Norma MRP.
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% | 58,392 psi | 90% | 3196 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 56,347 psi | 87% | 3209 fps | 98.5% |
| Accurate 3100 | <<locked>> | 98% | 56,869 psi | 88% | 3248 fps | 99.6% |
| Accurate 4064 | <<locked>> | 82% | 55,332 psi | 85% | 3202 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,972 psi | 89% | 3310 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 55,637 psi | 86% | 3241 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,390 psi | 85% | 3294 fps | 97.7% |
| ADI AR 2213 | <<locked>> | 98% | 57,377 psi | 88% | 3346 fps | 97.1% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,637 psi | 86% | 3291 fps | 97.8% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 55,637 psi | 86% | 3291 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,579 psi | 87% | 3261 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,608 psi | 87% | 3287 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 58,784 psi | 90% | 3376 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 56,521 psi | 87% | 3340 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,926 psi | 85% | 3278 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,855 psi | 88% | 3340 fps | 98.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,653 psi | 89% | 3323 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 49,879 psi | 77% | 3245 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,418 psi | 84% | 3343 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,782 psi | 86% | 3320 fps | 98% |
| Bofors RP3 | <<locked>> | 84% | 57,928 psi | 89% | 3278 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 56,855 psi | 88% | 3340 fps | 98.3% |
| Bofors RP7 | <<locked>> | 88% | 57,116 psi | 88% | 3261 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 84% | 58,102 psi | 89% | 3294 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 56,086 psi | 86% | 3301 fps | 99% |
| Hodgdon H4350 | <<locked>> | 86% | 55,245 psi | 85% | 3261 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 96% | 57,450 psi | 88% | 3287 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,202 psi | 86% | 3268 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,274 psi | 85% | 3232 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,733 psi | 75% | 3281 fps | 97.4% |
| Hodgdon Superformance | <<locked>> | 88% | 57,537 psi | 89% | 3337 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,216 psi | 56% | 2185 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 58,552 psi | 90% | 3281 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,435 psi | 88% | 3258 fps | 99.1% |
| IMR 4350 | <<locked>> | 90% | 55,129 psi | 85% | 3232 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 58,769 psi | 90% | 3291 fps | 99.2% |
| IMR 4831 | <<locked>> | 92% | 58,305 psi | 90% | 3301 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 58,146 psi | 89% | 3317 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 58,262 psi | 90% | 3274 fps | 96.8% |
| IMR 7828 SSC | <<locked>> | 98% | 54,795 psi | 84% | 3314 fps | 96.6% |
| Lovex S062 | <<locked>> | 82% | 55,085 psi | 85% | 3215 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,434 psi | 85% | 3225 fps | 99.6% |
| Lovex S070 | <<locked>> | 90% | 57,101 psi | 88% | 3271 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,198 psi | 77% | 3140 fps | 98.9% |
| Norma 203B | <<locked>> | 82% | 55,927 psi | 86% | 3271 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,362 psi | 87% | 3284 fps | 97.8% |
| Norma MRP | <<locked>> | 96% | 56,913 psi | 88% | 3369 fps | 99.2% |
| Norma URP | <<locked>> | 90% | 56,318 psi | 87% | 3294 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,551 psi | 89% | 3294 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,637 psi | 86% | 3330 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 90% | 55,550 psi | 85% | 3287 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,331 psi | 84% | 3258 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 57% | 2234 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 58,001 psi | 89% | 3274 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,550 psi | 85% | 3330 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 58,334 psi | 90% | 3327 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 56,942 psi | 88% | 3360 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,966 psi | 77% | 3281 fps | 98.8% |
| Rottweil R 902 | <<locked>> | 82% | 56,811 psi | 87% | 3232 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,972 psi | 89% | 3274 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 56,768 psi | 87% | 3261 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 96% | 57,972 psi | 89% | 3327 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 88% | 57,116 psi | 88% | 3261 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,434 psi | 85% | 3225 fps | 99.6% |
| Shooters World Precision | <<locked>> | 82% | 55,085 psi | 85% | 3215 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 57,101 psi | 88% | 3271 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,130 psi | 86% | 3274 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 58,291 psi | 90% | 3153 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,042 psi | 85% | 3169 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 57,508 psi | 89% | 3320 fps | 98.3% |
| Somchem S355 | <<locked>> | 86% | 57,667 psi | 89% | 3268 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,288 psi | 85% | 3182 fps | 96% |
| Somchem S365 | <<locked>> | 92% | 56,449 psi | 87% | 3294 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,824 psi | 84% | 3235 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 82% | 57,246 psi | 88% | 3189 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,870 psi | 89% | 3202 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,564 psi | 86% | 3186 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 58,523 psi | 90% | 3287 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 58,523 psi | 90% | 3268 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 56,318 psi | 87% | 3189 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 57,638 psi | 89% | 3287 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 55,724 psi | 86% | 3294 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,811 psi | 87% | 3353 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,839 psi | 84% | 3182 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 56,275 psi | 87% | 3307 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,216 psi | 85% | 3396 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,376 psi | 85% | 3228 fps | 97.8% |
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% | 54,520 psi | 84% | 3143 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 52,605 psi | 81% | 3146 fps | 97.8% |
| Accurate 3100 | <<locked>> | 86% | 36,622 psi | 56% | 2861 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 51,692 psi | 80% | 3146 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,045 psi | 62% | 2982 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 48,747 psi | 75% | 3123 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 88% | 44,962 psi | 69% | 3097 fps | 95% |
| ADI AR 2213 | <<locked>> | 94% | 49,647 psi | 76% | 3205 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 45,165 psi | 70% | 3091 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 45,165 psi | 70% | 3091 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,661 psi | 76% | 3153 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,011 psi | 82% | 3225 fps | 100% |
| Alliant Reloder-16 | 75.2 gr | 80% | 38,725 psi | 60% | 3002 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,947 psi | 69% | 3143 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 44,628 psi | 69% | 3081 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 45,905 psi | 71% | 3136 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,297 psi | 44% | 2700 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 90% | 35,172 psi | 54% | 2907 fps | 95.3% |
| Alliant Reloder-26 | 85.1 gr | 82% | 33,504 psi | 52% | 2897 fps | 95.3% |
| Bofors RP15 | <<locked>> | 94% | 45,092 psi | 69% | 3117 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 50,140 psi | 77% | 3156 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 45,905 psi | 71% | 3136 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 43,729 psi | 67% | 3012 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 50,589 psi | 78% | 3173 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 42,221 psi | 65% | 3038 fps | 95.9% |
| Hodgdon H4350 | <<locked>> | 80% | 44,933 psi | 69% | 3068 fps | 95.3% |
| Hodgdon H4831 | <<locked>> | 94% | 53,345 psi | 82% | 3219 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 52,170 psi | 80% | 3199 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,230 psi | 56% | 2877 fps | 98.4% |
| Hodgdon Retumbo | <<locked>> | 96% | 42,409 psi | 65% | 3133 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 41,814 psi | 64% | 3045 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,948 psi | 41% | 1969 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,256 psi | 79% | 3166 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,809 psi | 83% | 3196 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 42,148 psi | 65% | 2982 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,281 psi | 70% | 3048 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 38,377 psi | 59% | 2930 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 54,404 psi | 84% | 3261 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 51,111 psi | 79% | 3150 fps | 95% |
| IMR 7828 SSC | <<locked>> | 96% | 51,039 psi | 79% | 3245 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 51,517 psi | 79% | 3159 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,540 psi | 65% | 2986 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 40,901 psi | 63% | 2959 fps | 95.7% |
| Lovex S071 | <<locked>> | 92% | 38,043 psi | 59% | 2894 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 52,330 psi | 81% | 3212 fps | 100% |
| Norma 204 | <<locked>> | 84% | 45,339 psi | 70% | 3081 fps | 95% |
| Norma MRP | 88.6 gr | 88% | 41,887 psi | 64% | 3081 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 39,769 psi | 61% | 2982 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 53,461 psi | 82% | 3228 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 47,630 psi | 73% | 3182 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 38,798 psi | 60% | 2956 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 94% | 42,714 psi | 66% | 3038 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,398 psi | 42% | 2014 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,560 psi | 78% | 3150 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,761 psi | 74% | 3209 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,277 psi | 62% | 2999 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,928 psi | 60% | 3005 fps | 97.1% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 39,479 psi | 61% | 3035 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 53,171 psi | 82% | 3176 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,166 psi | 73% | 3097 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 49,588 psi | 76% | 3136 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 47,007 psi | 72% | 3130 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 43,729 psi | 67% | 3012 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,540 psi | 65% | 2986 fps | 97.4% |
| Shooters World Precision | <<locked>> | 80% | 51,517 psi | 79% | 3159 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,901 psi | 63% | 2959 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,762 psi | 75% | 3156 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,935 psi | 74% | 3005 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,829 psi | 64% | 2923 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 46,601 psi | 72% | 3123 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 47,166 psi | 73% | 3097 fps | 99.9% |
| Somchem S361 | <<locked>> | 90% | 51,445 psi | 79% | 3117 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,303 psi | 56% | 2927 fps | 99.4% |
| Somchem S385 | <<locked>> | 86% | 41,408 psi | 64% | 2976 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 53,635 psi | 83% | 3136 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,186 psi | 83% | 3150 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,295 psi | 70% | 3018 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,176 psi | 63% | 2982 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 92% | 44,193 psi | 68% | 3018 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 52,620 psi | 81% | 3136 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,799 psi | 63% | 2979 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 31,488 psi | 48% | 2785 fps | 95.3% |
| Vihtavuori N560 | <<locked>> | 94% | 52,808 psi | 81% | 3284 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,799 psi | 63% | 2943 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 42,366 psi | 65% | 3041 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,977 psi | 42% | 2720 fps | 95% |
| Winchester Supreme 780 | <<locked>> | 92% | 47,645 psi | 73% | 3091 fps | 96% |
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 87 powders for .300 Rem. Ultra Mag. loaded with the .308 | 123gr | Nosler Expansion Tip. Winchester StaBALL HD delivers the highest muzzle velocity at 3,396 fps; across all powders the maximum-charge window runs from 2,185 fps to 3,396 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 87 of the 87 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 123.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, Bofors RP15 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, Alliant Reloder-16, Norma MRP rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 123gr | Nosler Expansion Tip 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.