Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 350gr | North Fork Semi Spitz bullet and 47 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 Somchem S365.
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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Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100ᴾ | <<locked>> | 100% | 39,508 psi | 84% | 2100 fps | 96.9% |
| Accurate 4064 | <<locked>> | 82% | 41,278 psi | 88% | 2060 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,337 psi | 90% | 2152 fps | 99% |
| ADI AR 2208 | <<locked>> | 82% | 40,234 psi | 85% | 2037 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,366 psi | 90% | 2096 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 41,916 psi | 89% | 2162 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 41,800 psi | 89% | 2182 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,072 psi | 81% | 2126 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,090 psi | 89% | 2254 fps | 98.8% |
| Bofors RP3 | <<locked>> | 84% | 42,047 psi | 89% | 2103 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 82% | 40,364 psi | 86% | 2067 fps | 98.2% |
| Hodgdon H414 | <<locked>> | 90% | 42,221 psi | 90% | 2149 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 41,147 psi | 87% | 2110 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,636 psi | 76% | 1325 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,308 psi | 90% | 2064 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 42,076 psi | 89% | 2067 fps | 96.3% |
| IMR 4831 | <<locked>> | 92% | 40,640 psi | 86% | 2113 fps | 98.8% |
| Lovex S062 | <<locked>> | 82% | 42,163 psi | 89% | 2064 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 41,423 psi | 88% | 2064 fps | 97.6% |
| Lovex S070 | <<locked>> | 90% | 41,829 psi | 89% | 2090 fps | 96.6% |
| Norma 203B | <<locked>> | 82% | 42,134 psi | 89% | 2100 fps | 99.6% |
| Norma MRPᴾ | <<locked>> | 100% | 42,366 psi | 90% | 2221 fps | 96.4% |
| Norma URP | <<locked>> | 92% | 42,206 psi | 90% | 2146 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 82% | 41,626 psi | 88% | 2116 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 92% | 41,249 psi | 88% | 2142 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,027 psi | 76% | 1358 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 40,727 psi | 86% | 2054 fps | 96.7% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,698 psi | 88% | 2182 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,959 psi | 89% | 2172 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,090 psi | 89% | 2185 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 86% | 42,148 psi | 89% | 2100 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,423 psi | 88% | 2064 fps | 97.6% |
| Shooters World Precision | <<locked>> | 82% | 42,163 psi | 89% | 2064 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 41,829 psi | 89% | 2090 fps | 96.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 40,698 psi | 86% | 2103 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,366 psi | 90% | 2001 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 40,756 psi | 86% | 2021 fps | 96.1% |
| Somchem S355 | <<locked>> | 84% | 40,422 psi | 86% | 2060 fps | 99.6% |
| Somchem S365 | <<locked>> | 94% | 40,292 psi | 85% | 2152 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 40,959 psi | 87% | 2047 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 41,611 psi | 88% | 2106 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 82% | 42,496 psi | 90% | 2060 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 40,828 psi | 87% | 2110 fps | 98.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,553 psi | 88% | 2185 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 41,437 psi | 88% | 2090 fps | 99.8% |
| Winchester 760 | <<locked>> | 90% | 42,438 psi | 90% | 2152 fps | 96.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,026 psi | 72% | 2136 fps | 99.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 34,563 psi | 73% | 2014 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 38,783 psi | 82% | 2024 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,182 psi | 64% | 1936 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 37,884 psi | 80% | 1998 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,478 psi | 80% | 2018 fps | 99.5% |
| Alliant Reloder-16 | 52.4 gr | 80% | 29,095 psi | 62% | 1900 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,198 psi | 68% | 2001 fps | 98.2% |
| Alliant Reloder-23 | <<locked>> | 88% | 26,643 psi | 57% | 1877 fps | 95.6% |
| Alliant Reloder-26 | 66.6 gr | 92% | 32,271 psi | 68% | 2060 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 36,927 psi | 78% | 2021 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 80% | 37,797 psi | 80% | 2024 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 37,217 psi | 79% | 2060 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,687 psi | 57% | 1827 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,440 psi | 56% | 1181 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,769 psi | 84% | 2024 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 84% | 39,653 psi | 84% | 2028 fps | 95.6% |
| IMR 4831 | <<locked>> | 82% | 29,443 psi | 62% | 1903 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 39,653 psi | 84% | 2024 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 34,606 psi | 73% | 1946 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 36,941 psi | 78% | 2008 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 39,436 psi | 84% | 2057 fps | 99.3% |
| Norma MRP | <<locked>> | 98% | 39,711 psi | 84% | 2172 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 30,821 psi | 65% | 1939 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 38,827 psi | 82% | 2070 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 36,463 psi | 77% | 2057 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,890 psi | 57% | 1211 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,203 psi | 81% | 2011 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,272 psi | 73% | 2051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 30,008 psi | 64% | 1949 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 32,314 psi | 69% | 1995 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 34,896 psi | 74% | 1978 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 82% | 34,606 psi | 73% | 1946 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 39,653 psi | 84% | 2024 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 36,941 psi | 78% | 2008 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,694 psi | 76% | 2018 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,376 psi | 79% | 1929 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 38,319 psi | 81% | 1982 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 35,752 psi | 76% | 1982 fps | 99% |
| Somchem S365 | 53.5 gr | 80% | 25,846 psi | 55% | 1857 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 80% | 33,982 psi | 72% | 1932 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 30,124 psi | 64% | 1896 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 39,842 psi | 85% | 2021 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 31,560 psi | 67% | 1939 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 88% | 28,442 psi | 60% | 1936 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,950 psi | 64% | 1877 fps | 97.5% |
| Winchester 760 | <<locked>> | 86% | 37,217 psi | 79% | 2060 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 92% | 26,498 psi | 56% | 1936 fps | 95.9% |
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 47 powders for .375 Fl. Mag. N.E. loaded with the .375 | 350gr | North Fork Semi Spitz. Alliant Reloder-26 delivers the highest muzzle velocity at 2,254 fps; across all powders the maximum-charge window runs from 1,325 fps to 2,254 fps. Accurate 3100 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 350.0 gr projectile in 0.375" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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, Somchem S365 rank at the top here: for .375 Fl. Mag. N.E. with the .375 | 350gr | North Fork Semi Spitz 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.