Load Specifications
Load data in caliber .375 Rem. Ultra Mag. with .375 | 350gr | Woodleigh RN SN bullet and 91 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Norma MRP and Accurate MAGPRO.
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% | 56,420 psi | 88% | 2343 fps | 99.8% |
| Accurate 3100 | <<locked>> | 98% | 55,259 psi | 87% | 2392 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 56,347 psi | 88% | 2316 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,392 psi | 90% | 2425 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 56,608 psi | 89% | 2526 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 98% | 57,537 psi | 90% | 2526 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 84% | 55,941 psi | 88% | 2349 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,476 psi | 85% | 2428 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 98% | 55,637 psi | 87% | 2477 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,468 psi | 68% | 2290 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 2257 fps | 98.6% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,563 psi | 86% | 2425 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,826 psi | 89% | 2365 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 57,072 psi | 89% | 2385 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,505 psi | 85% | 2425 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,666 psi | 87% | 2441 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,363 psi | 90% | 2464 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 55,042 psi | 86% | 2474 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2444 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,167 psi | 75% | 2405 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 56,057 psi | 88% | 2526 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,505 psi | 85% | 2395 fps | 96.2% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,027 psi | 85% | 2461 fps | 99.6% |
| Bofors RP3 | <<locked>> | 82% | 54,331 psi | 85% | 2339 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,092 psi | 69% | 2349 fps | 97.8% |
| Bofors RP5 | <<locked>> | 98% | 55,042 psi | 86% | 2474 fps | 99.7% |
| Bofors RP7 | <<locked>> | 88% | 56,898 psi | 89% | 2382 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,718 psi | 75% | 2359 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 82% | 54,476 psi | 85% | 2359 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,651 psi | 87% | 2428 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 55,027 psi | 86% | 2392 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 96% | 55,738 psi | 87% | 2425 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,679 psi | 86% | 2411 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,824 psi | 86% | 2359 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,253 psi | 74% | 2454 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 88% | 55,709 psi | 87% | 2461 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,724 psi | 58% | 1453 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 55,347 psi | 87% | 2333 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,653 psi | 90% | 2365 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,737 psi | 86% | 2372 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 55,129 psi | 86% | 2359 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 57,667 psi | 90% | 2415 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 57,014 psi | 89% | 2411 fps | 98.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,840 psi | 89% | 2503 fps | 99.3% |
| Lovex S062 | <<locked>> | 82% | 55,738 psi | 87% | 2326 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,448 psi | 87% | 2356 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,753 psi | 89% | 2395 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,284 psi | 77% | 2320 fps | 100% |
| Norma 203B | <<locked>> | 82% | 56,420 psi | 88% | 2375 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,506 psi | 87% | 2418 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 33,968 psi | 53% | 2198 fps | 96.7% |
| Norma MRP | <<locked>> | 96% | 54,708 psi | 86% | 2493 fps | 100% |
| Norma URP | <<locked>> | 90% | 55,796 psi | 87% | 2408 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 57,217 psi | 90% | 2398 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,696 psi | 90% | 2523 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 90% | 54,694 psi | 86% | 2418 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,445 psi | 81% | 2415 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,492 psi | 59% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,331 psi | 85% | 2349 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 55,085 psi | 86% | 2431 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,276 psi | 90% | 2448 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,434 psi | 87% | 2474 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,297 psi | 74% | 2451 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 82% | 57,493 psi | 90% | 2329 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,578 psi | 86% | 2339 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,941 psi | 88% | 2402 fps | 99% |
| Rottweil R 905 | <<locked>> | 96% | 56,884 psi | 89% | 2454 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 88% | 56,898 psi | 89% | 2382 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,448 psi | 87% | 2356 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,738 psi | 87% | 2326 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,753 psi | 89% | 2395 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 56,014 psi | 88% | 2388 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,100 psi | 86% | 2231 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,868 psi | 86% | 2320 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,420 psi | 88% | 2451 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 54,302 psi | 85% | 2333 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,711 psi | 90% | 2398 fps | 98.7% |
| Somchem S365 | <<locked>> | 92% | 55,695 psi | 87% | 2411 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,450 psi | 90% | 2428 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,448 psi | 87% | 2310 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,302 psi | 85% | 2359 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,637 psi | 89% | 2408 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 82% | 56,275 psi | 88% | 2306 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,985 psi | 89% | 2411 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,737 psi | 86% | 2425 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,810 psi | 86% | 2490 fps | 98.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,430 psi | 79% | 2418 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,421 psi | 90% | 2369 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,840 psi | 88% | 2431 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,953 psi | 81% | 2513 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,363 psi | 90% | 2425 fps | 99.7% |
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% | 52,808 psi | 83% | 2297 fps | 99.6% |
| Accurate 3100 | <<locked>> | 80% | 30,298 psi | 47% | 1998 fps | 96.7% |
| Accurate 4064 | <<locked>> | 80% | 52,924 psi | 83% | 2277 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,002 psi | 64% | 2205 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 37,391 psi | 59% | 2224 fps | 95.4% |
| Accurate MAGPRO | 86.4 gr | 90% | 43,439 psi | 68% | 2323 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 49,342 psi | 77% | 2267 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 34,519 psi | 54% | 2100 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 88% | 39,987 psi | 63% | 2231 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 96% | 38,145 psi | 60% | 2192 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 92% | 29,950 psi | 47% | 2064 fps | 95% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 34,737 psi | 54% | 2103 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,285 psi | 79% | 2287 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,606 psi | 84% | 2346 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,537 psi | 62% | 2211 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,078 psi | 71% | 2306 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 34,432 psi | 54% | 2100 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 84% | 34,592 psi | 54% | 2142 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,196 psi | 46% | 2024 fps | 99.3% |
| Alliant Reloder-25 | <<locked>> | 82% | 27,325 psi | 43% | 1991 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 31,314 psi | 49% | 2129 fps | 98.5% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 51,271 psi | 80% | 2349 fps | 95.4% |
| Bofors RP15 | <<locked>> | 86% | 34,301 psi | 54% | 2133 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 50,952 psi | 80% | 2300 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 36,230 psi | 57% | 2208 fps | 95.4% |
| Bofors RP5 | <<locked>> | 84% | 34,592 psi | 54% | 2142 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 44,411 psi | 70% | 2208 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 92% | 36,535 psi | 57% | 2162 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 50,952 psi | 80% | 2313 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,801 psi | 67% | 2244 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 45,585 psi | 71% | 2257 fps | 98.6% |
| Hodgdon H4831 | <<locked>> | 86% | 39,842 psi | 62% | 2185 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 88% | 41,930 psi | 66% | 2224 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,144 psi | 58% | 2116 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 34,258 psi | 54% | 2195 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 41,582 psi | 65% | 2260 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 43% | 1299 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,909 psi | 81% | 2290 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 54,201 psi | 85% | 2323 fps | 99.9% |
| IMR 4350 | <<locked>> | 80% | 40,045 psi | 63% | 2152 fps | 98% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,803 psi | 72% | 2228 fps | 99.3% |
| IMR 4831 | <<locked>> | 80% | 39,175 psi | 61% | 2162 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 39,392 psi | 62% | 2146 fps | 95% |
| IMR 7828 SSC | <<locked>> | 88% | 38,203 psi | 60% | 2208 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 52,373 psi | 82% | 2283 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,410 psi | 68% | 2188 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 41,684 psi | 65% | 2182 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 27,789 psi | 44% | 1939 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 52,968 psi | 83% | 2333 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,523 psi | 62% | 2178 fps | 96.8% |
| Norma 217 | <<locked>> | 98% | 31,850 psi | 50% | 2146 fps | 95.7% |
| Norma MRP | 75.4 gr | 80% | 31,473 psi | 49% | 2100 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 40,509 psi | 63% | 2198 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 80% | 53,563 psi | 84% | 2356 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 37,826 psi | 59% | 2215 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 39,204 psi | 61% | 2192 fps | 99% |
| Ramshot Magnum | <<locked>> | 88% | 33,518 psi | 53% | 2116 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 44% | 1332 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,923 psi | 80% | 2303 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,819 psi | 75% | 2343 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,625 psi | 64% | 2221 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,175 psi | 61% | 2234 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 31,183 psi | 49% | 2126 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 54,215 psi | 85% | 2293 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,964 psi | 75% | 2257 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 38,232 psi | 60% | 2129 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 33,518 psi | 53% | 2083 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 44,411 psi | 70% | 2208 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,410 psi | 68% | 2188 fps | 99.7% |
| Shooters World Precision | <<locked>> | 80% | 52,373 psi | 82% | 2283 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,684 psi | 65% | 2182 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,023 psi | 77% | 2303 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,646 psi | 76% | 2159 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,366 psi | 66% | 2146 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,214 psi | 52% | 2080 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 48,022 psi | 75% | 2254 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 41,452 psi | 65% | 2165 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 37,144 psi | 58% | 2162 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,229 psi | 54% | 2073 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 80% | 45,919 psi | 72% | 2192 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,930 psi | 66% | 2192 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 33,620 psi | 53% | 2057 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 52,765 psi | 83% | 2267 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,191 psi | 65% | 2195 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 32,590 psi | 51% | 2087 fps | 99.3% |
| Vihtavuori N560 | 81.1 gr | 86% | 39,131 psi | 61% | 2241 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 92% | 38,508 psi | 60% | 2224 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,828 psi | 64% | 2162 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,801 psi | 67% | 2244 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,773 psi | 40% | 2028 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 84% | 35,549 psi | 56% | 2100 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 91 powders for .375 Rem. Ultra Mag. loaded with the .375 | 350gr | Woodleigh RN SN. Accurate High Country delivers the highest muzzle velocity at 2,526 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,526 fps. ADI AR 2217 gives the best case fill at 100 %, and 91 of the 91 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 350.0 gr projectile in 0.375" calls for a 1:6.0 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. Vihtavuori N560, Norma MRP, Accurate MAGPRO rank at the top here: for .375 Rem. Ultra Mag. with the .375 | 350gr | Woodleigh RN SN 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.