Load Specifications
Load data in caliber .375 Rem. Ultra Mag. with .375 | 350gr | Woodleigh PP SN bullet and 92 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% | 55,912 psi | 88% | 2333 fps | 99.8% |
| Accurate 3100 | <<locked>> | 98% | 54,839 psi | 86% | 2385 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,724 psi | 87% | 2306 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,826 psi | 89% | 2415 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 55,985 psi | 88% | 2516 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 98% | 56,927 psi | 89% | 2516 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 84% | 55,390 psi | 87% | 2339 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,522 psi | 90% | 2464 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 98% | 55,013 psi | 86% | 2464 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,004 psi | 67% | 2277 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,058 psi | 60% | 2251 fps | 98.5% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 57,725 psi | 90% | 2461 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,463 psi | 88% | 2359 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,536 psi | 89% | 2379 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,421 psi | 90% | 2457 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,114 psi | 86% | 2434 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,927 psi | 89% | 2454 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,404 psi | 85% | 2464 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,158 psi | 86% | 2434 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,805 psi | 75% | 2398 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,347 psi | 87% | 2516 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 57,508 psi | 90% | 2434 fps | 96.7% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 2448 fps | 99.5% |
| Bofors RP3 | <<locked>> | 84% | 57,551 psi | 90% | 2375 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,743 psi | 69% | 2339 fps | 97.6% |
| Bofors RP5 | <<locked>> | 98% | 54,404 psi | 85% | 2464 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 56,608 psi | 89% | 2375 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,195 psi | 74% | 2349 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 84% | 57,725 psi | 90% | 2395 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 55,143 psi | 86% | 2418 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 54,752 psi | 86% | 2385 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 96% | 55,303 psi | 87% | 2418 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,056 psi | 85% | 2402 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,740 psi | 90% | 2388 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,862 psi | 73% | 2444 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 88% | 55,259 psi | 87% | 2454 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1453 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,940 psi | 86% | 2323 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,319 psi | 90% | 2359 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,273 psi | 85% | 2362 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,650 psi | 86% | 2349 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 57,174 psi | 90% | 2408 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,652 psi | 89% | 2402 fps | 98.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,434 psi | 88% | 2493 fps | 99.2% |
| Lovex S062 | <<locked>> | 82% | 55,172 psi | 86% | 2316 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,955 psi | 86% | 2349 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,275 psi | 88% | 2385 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,791 psi | 76% | 2310 fps | 99.9% |
| Norma 203B | <<locked>> | 82% | 55,825 psi | 87% | 2365 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,810 psi | 86% | 2408 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 33,518 psi | 53% | 2185 fps | 96.4% |
| Norma MRP | <<locked>> | 96% | 54,027 psi | 85% | 2484 fps | 100% |
| Norma URP | <<locked>> | 90% | 55,274 psi | 87% | 2402 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,666 psi | 89% | 2388 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,058 psi | 89% | 2510 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 92% | 57,740 psi | 90% | 2454 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,908 psi | 80% | 2405 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,565 psi | 59% | 1486 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,464 psi | 90% | 2382 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,505 psi | 85% | 2421 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,739 psi | 89% | 2438 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,998 psi | 86% | 2464 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,847 psi | 73% | 2441 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 82% | 57,130 psi | 90% | 2323 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,609 psi | 90% | 2369 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,506 psi | 87% | 2392 fps | 98.9% |
| Rottweil R 905 | <<locked>> | 96% | 56,246 psi | 88% | 2441 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 88% | 56,608 psi | 89% | 2375 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,955 psi | 86% | 2349 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,172 psi | 86% | 2316 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,275 psi | 88% | 2385 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,477 psi | 87% | 2382 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,578 psi | 86% | 2224 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,418 psi | 85% | 2310 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,782 psi | 87% | 2438 fps | 99.7% |
| Somchem S355 | <<locked>> | 86% | 57,421 psi | 90% | 2365 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,145 psi | 90% | 2388 fps | 98.5% |
| Somchem S365 | <<locked>> | 92% | 55,158 psi | 86% | 2402 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,840 psi | 89% | 2418 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 82% | 57,638 psi | 90% | 2297 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,114 psi | 86% | 2303 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,363 psi | 90% | 2392 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,202 psi | 88% | 2402 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 82% | 55,767 psi | 87% | 2300 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,521 psi | 89% | 2402 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,215 psi | 85% | 2418 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,172 psi | 85% | 2477 fps | 98.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,835 psi | 78% | 2408 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,782 psi | 89% | 2362 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,332 psi | 87% | 2421 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,184 psi | 80% | 2503 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,000 psi | 89% | 2418 fps | 99.6% |
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 2700 | <<locked>> | 80% | 52,518 psi | 82% | 2290 fps | 99.6% |
| Accurate 3100 | <<locked>> | 80% | 30,008 psi | 47% | 1988 fps | 96.5% |
| Accurate 4064 | <<locked>> | 80% | 52,518 psi | 82% | 2270 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,640 psi | 64% | 2198 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 36,956 psi | 58% | 2215 fps | 95.2% |
| Accurate MAGPRO | 85.7 gr | 90% | 43,018 psi | 67% | 2313 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 48,994 psi | 77% | 2257 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 34,258 psi | 54% | 2090 fps | 95% |
| ADI AR 2213 | <<locked>> | 88% | 39,653 psi | 62% | 2221 fps | 95.5% |
| ADI AR 2217 | <<locked>> | 98% | 40,277 psi | 63% | 2228 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 94% | 31,473 psi | 49% | 2100 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 34,476 psi | 54% | 2096 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,922 psi | 78% | 2280 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,258 psi | 83% | 2339 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,189 psi | 61% | 2205 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,701 psi | 70% | 2300 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 34,156 psi | 54% | 2090 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 84% | 34,301 psi | 54% | 2133 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,921 psi | 45% | 2014 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 27,006 psi | 42% | 1978 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 30,922 psi | 48% | 2119 fps | 98.3% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 50,981 psi | 80% | 2343 fps | 95.2% |
| Bofors RP15 | <<locked>> | 86% | 34,011 psi | 53% | 2126 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 50,401 psi | 79% | 2290 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 35,897 psi | 56% | 2198 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 34,301 psi | 54% | 2133 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 44,048 psi | 69% | 2198 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 36,245 psi | 57% | 2152 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 50,633 psi | 79% | 2306 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,337 psi | 66% | 2234 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 45,121 psi | 71% | 2247 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 88% | 42,308 psi | 66% | 2228 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 41,524 psi | 65% | 2215 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,782 psi | 58% | 2110 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 33,939 psi | 53% | 2185 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 41,147 psi | 64% | 2251 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,441 psi | 43% | 1296 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,561 psi | 81% | 2283 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,853 psi | 84% | 2316 fps | 99.9% |
| IMR 4350 | <<locked>> | 80% | 39,755 psi | 62% | 2146 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,498 psi | 71% | 2221 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 38,856 psi | 61% | 2156 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 86% | 41,553 psi | 65% | 2178 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 88% | 37,956 psi | 59% | 2201 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 51,996 psi | 81% | 2277 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,047 psi | 67% | 2182 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 41,379 psi | 65% | 2172 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 27,630 psi | 43% | 1936 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 52,605 psi | 82% | 2326 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,233 psi | 61% | 2172 fps | 96.7% |
| Norma 217 | <<locked>> | 98% | 31,415 psi | 49% | 2133 fps | 95.4% |
| Norma MRP | 74.8 gr | 80% | 31,227 psi | 49% | 2093 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 40,132 psi | 63% | 2188 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 80% | 53,040 psi | 83% | 2346 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 37,405 psi | 59% | 2205 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 38,899 psi | 61% | 2185 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 88% | 33,214 psi | 52% | 2106 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,050 psi | 44% | 1329 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,415 psi | 79% | 2293 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,456 psi | 74% | 2336 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,306 psi | 63% | 2215 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,769 psi | 61% | 2224 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 30,879 psi | 48% | 2113 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 53,824 psi | 84% | 2283 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,601 psi | 75% | 2251 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 37,942 psi | 59% | 2123 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 33,185 psi | 52% | 2073 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 44,048 psi | 69% | 2198 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,047 psi | 67% | 2182 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 51,996 psi | 81% | 2277 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,379 psi | 65% | 2172 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,704 psi | 76% | 2297 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,443 psi | 76% | 2152 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,090 psi | 66% | 2136 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 35,215 psi | 55% | 2119 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 47,659 psi | 75% | 2247 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 41,075 psi | 64% | 2159 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 36,738 psi | 58% | 2156 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,808 psi | 53% | 2064 fps | 96.2% |
| Vihtavuori N140 | <<locked>> | 80% | 54,317 psi | 85% | 2260 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,585 psi | 71% | 2185 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,582 psi | 65% | 2185 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 33,257 psi | 52% | 2047 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 52,431 psi | 82% | 2260 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,886 psi | 64% | 2188 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 32,140 psi | 50% | 2073 fps | 99.1% |
| Vihtavuori N560 | 82.2 gr | 88% | 41,321 psi | 65% | 2280 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 92% | 37,971 psi | 60% | 2215 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,408 psi | 63% | 2152 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,453 psi | 67% | 2238 fps | 99% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,570 psi | 40% | 2018 fps | 99.2% |
| Winchester Supreme 780 | <<locked>> | 84% | 35,288 psi | 55% | 2093 fps | 95.6% |
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 92 powders for .375 Rem. Ultra Mag. loaded with the .375 | 350gr | Woodleigh PP SN. Accurate High Country delivers the highest muzzle velocity at 2,516 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,516 fps. ADI AR 2217 gives the best case fill at 100 %, and 92 of the 92 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 PP 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.