Load Specifications
Load data in caliber .300 Rem. Ultra Mag. with .308 | 125gr | Remington PSP bullet and 78 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% | 56,608 psi | 87% | 3225 fps | 99.7% |
| Accurate 4064 | <<locked>> | 82% | 58,668 psi | 90% | 3225 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,377 psi | 88% | 3281 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 58,059 psi | 89% | 3255 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 58,552 psi | 90% | 3323 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 96% | 56,536 psi | 87% | 3314 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,235 psi | 65% | 3058 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,811 psi | 86% | 3228 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 58,030 psi | 89% | 3343 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,550 psi | 85% | 3301 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 58,015 psi | 89% | 3310 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,362 psi | 87% | 3310 fps | 98.4% |
| Alliant Reloder-23 | <<locked>> | 98% | 57,290 psi | 88% | 3294 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,287 psi | 82% | 3284 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 58,523 psi | 90% | 3383 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,332 psi | 85% | 3291 fps | 98.1% |
| Bofors RP3 | <<locked>> | 82% | 57,116 psi | 88% | 3241 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,255 psi | 76% | 3192 fps | 96.2% |
| Bofors RP5 | <<locked>> | 96% | 56,362 psi | 87% | 3310 fps | 98.4% |
| Bofors RP7 | <<locked>> | 86% | 56,173 psi | 86% | 3225 fps | 98.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,475 psi | 81% | 3222 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 82% | 57,058 psi | 88% | 3258 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,245 psi | 85% | 3268 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 86% | 57,914 psi | 89% | 3287 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 94% | 56,376 psi | 87% | 3251 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,216 psi | 85% | 3232 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 58,450 psi | 90% | 3258 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,025 psi | 80% | 3333 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 86% | 56,318 psi | 87% | 3297 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,637 psi | 56% | 2182 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,348 psi | 88% | 3241 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,914 psi | 89% | 3255 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,580 psi | 89% | 3251 fps | 99.2% |
| IMR 4831 | <<locked>> | 90% | 57,740 psi | 89% | 3268 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,377 psi | 88% | 3241 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 98% | 58,233 psi | 90% | 3356 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 57,827 psi | 89% | 3232 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 58,204 psi | 90% | 3251 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 56,449 psi | 87% | 3241 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,809 psi | 83% | 3179 fps | 99.5% |
| Norma 204 | <<locked>> | 88% | 55,303 psi | 85% | 3248 fps | 97.8% |
| Norma MRP | <<locked>> | 94% | 56,289 psi | 87% | 3333 fps | 99.3% |
| Norma URP | <<locked>> | 88% | 55,709 psi | 86% | 3261 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,969 psi | 85% | 3301 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 90% | 58,798 psi | 90% | 3317 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 58,247 psi | 90% | 3301 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,289 psi | 57% | 2228 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,855 psi | 88% | 3238 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,723 psi | 84% | 3294 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,609 psi | 89% | 3294 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,014 psi | 86% | 3323 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,534 psi | 82% | 3333 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 57,319 psi | 88% | 3241 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,999 psi | 86% | 3232 fps | 97.1% |
| Rottweil R 905 | <<locked>> | 94% | 57,377 psi | 88% | 3297 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 86% | 56,173 psi | 86% | 3225 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 58,204 psi | 90% | 3251 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 57,827 psi | 89% | 3232 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,449 psi | 87% | 3241 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,158 psi | 85% | 3241 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,159 psi | 88% | 3117 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,943 psi | 89% | 3196 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,927 psi | 88% | 3291 fps | 98.4% |
| Somchem S355 | <<locked>> | 84% | 56,927 psi | 88% | 3238 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 58,117 psi | 89% | 3212 fps | 96.9% |
| Somchem S365 | <<locked>> | 90% | 56,028 psi | 86% | 3264 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 58,146 psi | 89% | 3264 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 86% | 58,392 psi | 90% | 3202 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,595 psi | 89% | 3255 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,769 psi | 89% | 3235 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 88% | 57,000 psi | 88% | 3258 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,666 psi | 86% | 3271 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,115 psi | 86% | 3323 fps | 96.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,333 psi | 87% | 3291 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,856 psi | 89% | 3202 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,492 psi | 85% | 3271 fps | 99.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 55,259 psi | 85% | 3369 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 58,566 psi | 90% | 3258 fps | 98.5% |
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>> | 84% | 36,970 psi | 57% | 2848 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 55,027 psi | 85% | 3173 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 43,047 psi | 66% | 3025 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 51,126 psi | 79% | 3146 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 86% | 44,411 psi | 68% | 3064 fps | 95.1% |
| ADI AR 2213 | 91.5 gr | 92% | 49,008 psi | 75% | 3176 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 39,552 psi | 61% | 2989 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,185 psi | 80% | 3169 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,191 psi | 63% | 3038 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,892 psi | 74% | 3176 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 44,251 psi | 68% | 3054 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 90% | 45,542 psi | 70% | 3110 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,589 psi | 47% | 2753 fps | 96.7% |
| Alliant Reloder-25 | <<locked>> | 88% | 35,186 psi | 54% | 2887 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,576 psi | 52% | 2877 fps | 95.6% |
| Bofors RP15 | <<locked>> | 92% | 44,904 psi | 69% | 3094 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 53,301 psi | 82% | 3186 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 45,759 psi | 70% | 3123 fps | 95.1% |
| Bofors RP5 | <<locked>> | 90% | 45,542 psi | 70% | 3110 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 46,166 psi | 71% | 3045 fps | 96.8% |
| Hodgdon H1000 | <<locked>> | 96% | 45,368 psi | 70% | 3081 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 53,316 psi | 82% | 3199 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 44,933 psi | 69% | 3074 fps | 97% |
| Hodgdon H4350 | <<locked>> | 80% | 47,500 psi | 73% | 3100 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 92% | 52,533 psi | 81% | 3186 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 51,445 psi | 79% | 3166 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,798 psi | 60% | 2913 fps | 99.2% |
| Hodgdon Retumbo | <<locked>> | 94% | 42,235 psi | 65% | 3110 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 44,701 psi | 69% | 3084 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 42% | 1965 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,780 psi | 83% | 3182 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,655 psi | 64% | 2956 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,543 psi | 73% | 3074 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 41,017 psi | 63% | 2969 fps | 98.4% |
| IMR 4955 Enduron | <<locked>> | 90% | 50,372 psi | 78% | 3120 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 94% | 50,401 psi | 78% | 3212 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 54,259 psi | 84% | 3179 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 45,034 psi | 69% | 3018 fps | 98.2% |
| Lovex S070 | <<locked>> | 80% | 43,453 psi | 67% | 2999 fps | 96.8% |
| Lovex S071 | <<locked>> | 88% | 35,882 psi | 55% | 2822 fps | 95.2% |
| Norma 204 | <<locked>> | 82% | 44,715 psi | 69% | 3048 fps | 95.1% |
| Norma MRP | 88.3 gr | 86% | 41,771 psi | 64% | 3058 fps | 96.1% |
| Norma URP | <<locked>> | 80% | 42,380 psi | 65% | 3018 fps | 98.6% |
| Ramshot Grand | <<locked>> | 92% | 47,152 psi | 73% | 3153 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 41,408 psi | 64% | 2999 fps | 96.9% |
| Ramshot Magnum | <<locked>> | 92% | 42,467 psi | 65% | 3015 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 43% | 2008 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,214 psi | 82% | 3176 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,836 psi | 78% | 3235 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,192 psi | 66% | 3041 fps | 98.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,640 psi | 64% | 3051 fps | 98.2% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 39,378 psi | 61% | 3018 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 50,082 psi | 77% | 3127 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 48,979 psi | 75% | 3104 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 86% | 43,497 psi | 67% | 3038 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 46,166 psi | 71% | 3045 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,034 psi | 69% | 3018 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 54,259 psi | 84% | 3179 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,453 psi | 67% | 2999 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,561 psi | 79% | 3179 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,183 psi | 77% | 3018 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,222 psi | 68% | 2956 fps | 97% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 46,151 psi | 71% | 3097 fps | 96% |
| Somchem S355 | <<locked>> | 80% | 49,879 psi | 77% | 3123 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 50,633 psi | 78% | 3087 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 39,117 psi | 60% | 2969 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 41,321 psi | 64% | 2956 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 47,892 psi | 74% | 3045 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,758 psi | 67% | 3015 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 90% | 43,947 psi | 68% | 2995 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 43,323 psi | 67% | 3012 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 34,258 psi | 53% | 2844 fps | 96.8% |
| Vihtavuori N560 | 94.5 gr | 92% | 52,243 psi | 80% | 3255 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 96% | 48,675 psi | 75% | 3153 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,250 psi | 67% | 2972 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 45,092 psi | 69% | 3077 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,311 psi | 42% | 2720 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 88% | 43,903 psi | 68% | 3002 fps | 95.2% |
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 84 powders for .300 Rem. Ultra Mag. loaded with the .308 | 125gr | Remington PSP. Alliant Reloder-26 delivers the highest muzzle velocity at 3,383 fps; across all powders the maximum-charge window runs from 2,182 fps to 3,383 fps. ADI AR 2217 gives the best case fill at 100 %, and 84 of the 84 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 125.0 gr projectile in 0.308" calls for a 1:15.0 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. Norma MRP, Vihtavuori N560, ADI AR 2213 rank at the top here: for .300 Rem. Ultra Mag. with the .308 | 125gr | Remington PSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, Norma 217, ReloadSwiss RS 80 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.