Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 350gr | Woodleigh RN SN bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Somchem S365 and Vihtavuori N555.
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 3100 | <<locked>> | 98% | 40,321 psi | 86% | 2143 fps | 97.7% |
| Accurate 4350 | <<locked>> | 88% | 40,132 psi | 85% | 2139 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 82% | 42,656 psi | 90% | 2109 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 42,598 psi | 90% | 2130 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 42,192 psi | 90% | 2200 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 41,974 psi | 89% | 2217 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,843 psi | 89% | 2212 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,202 psi | 79% | 2136 fps | 97% |
| Alliant Reloder-26 | <<locked>> | 96% | 39,943 psi | 85% | 2254 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 42,438 psi | 90% | 2137 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 40,350 psi | 86% | 2072 fps | 96% |
| Hodgdon H414 | <<locked>> | 84% | 40,640 psi | 86% | 2155 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 41,684 psi | 88% | 2148 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 42,018 psi | 89% | 2205 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,883 psi | 78% | 1360 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 41,771 psi | 89% | 2080 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 41,452 psi | 88% | 2064 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 40,524 psi | 86% | 2093 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,887 psi | 89% | 2090 fps | 96.7% |
| IMR 4831 | <<locked>> | 94% | 42,032 psi | 89% | 2164 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 41,684 psi | 88% | 2102 fps | 98.2% |
| Lovex S070 | <<locked>> | 88% | 41,945 psi | 89% | 2126 fps | 97.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,753 psi | 78% | 2071 fps | 96.5% |
| Norma MRP | <<locked>> | 96% | 40,176 psi | 85% | 2220 fps | 96.5% |
| Norma URP | <<locked>> | 88% | 40,030 psi | 85% | 2142 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 90% | 41,626 psi | 88% | 2181 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,622 psi | 78% | 1391 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 41,843 psi | 89% | 2216 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 42,583 psi | 90% | 2211 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 42,134 psi | 89% | 2224 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 84% | 42,540 psi | 90% | 2133 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 40,350 psi | 86% | 2072 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 86% | 41,684 psi | 88% | 2102 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 88% | 41,945 psi | 89% | 2119 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 40,770 psi | 86% | 2135 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 42,148 psi | 89% | 2025 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,901 psi | 87% | 2056 fps | 96.7% |
| Somchem S355 | <<locked>> | 82% | 40,480 psi | 86% | 2092 fps | 99.8% |
| Somchem S365 | <<locked>> | 92% | 41,031 psi | 87% | 2194 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 40,640 psi | 86% | 2139 fps | 96.1% |
| Unknown powder | <<locked>> | 86% | 40,843 psi | 87% | 2146 fps | 98.6% |
| Vihtavuori N150 | <<locked>> | 88% | 41,800 psi | 89% | 2090 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 41,031 psi | 87% | 2125 fps | 99% |
| Vihtavuori N550 | <<locked>> | 86% | 41,336 psi | 88% | 2161 fps | 99% |
| Vihtavuori N555 | <<locked>> | 96% | 39,827 psi | 84% | 2186 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 41,539 psi | 88% | 2125 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 40,640 psi | 86% | 2155 fps | 96.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,449 psi | 79% | 2236 fps | 100% |
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>> | 92% | 32,996 psi | 70% | 2014 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 30,647 psi | 65% | 1962 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 80% | 40,132 psi | 85% | 2069 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,856 psi | 85% | 2086 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,082 psi | 66% | 1981 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,461 psi | 73% | 2080 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 25,324 psi | 54% | 1870 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 96% | 32,140 psi | 68% | 2044 fps | 95.2% |
| Alliant Reloder-26 | 68.1 gr | 88% | 30,472 psi | 65% | 2053 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 39,639 psi | 84% | 2093 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 37,942 psi | 80% | 2030 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 35,607 psi | 76% | 2063 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,514 psi | 60% | 1900 fps | 97.5% |
| Hodgdon Superformance | <<locked>> | 86% | 39,204 psi | 83% | 2155 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,760 psi | 57% | 1211 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,436 psi | 84% | 2041 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 39,030 psi | 83% | 2022 fps | 96.2% |
| IMR 4350 | <<locked>> | 86% | 38,174 psi | 81% | 2051 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,159 psi | 79% | 2008 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 27,079 psi | 57% | 1875 fps | 95% |
| Lovex S065 | <<locked>> | 80% | 34,606 psi | 73% | 1976 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 34,969 psi | 74% | 2001 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 31,633 psi | 67% | 1987 fps | 95% |
| Norma MRP | <<locked>> | 94% | 37,608 psi | 80% | 2171 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 31,096 psi | 66% | 1972 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 84% | 34,301 psi | 73% | 2046 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,209 psi | 58% | 1242 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,651 psi | 78% | 2127 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,298 psi | 64% | 1983 fps | 96% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 32,430 psi | 69% | 2033 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 37,449 psi | 79% | 2052 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 82% | 37,942 psi | 80% | 2030 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,606 psi | 73% | 1976 fps | 96.3% |
| Shooters World SW4350 | <<locked>> | 82% | 34,969 psi | 74% | 1991 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,334 psi | 81% | 2094 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,552 psi | 84% | 1988 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 35,926 psi | 76% | 1972 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 38,087 psi | 81% | 2052 fps | 99.6% |
| Somchem S365 | 57.3 gr | 80% | 27,847 psi | 59% | 1937 fps | 98.6% |
| Somchem S385 | <<locked>> | 92% | 38,058 psi | 81% | 2095 fps | 95.3% |
| Unknown powder | <<locked>> | 80% | 33,678 psi | 71% | 2015 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 32,590 psi | 69% | 1935 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 33,678 psi | 71% | 1995 fps | 97.3% |
| Vihtavuori N550 | <<locked>> | 80% | 34,069 psi | 72% | 2030 fps | 97.4% |
| Vihtavuori N555 | 59.3 gr | 84% | 27,166 psi | 58% | 1932 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,995 psi | 68% | 1954 fps | 98.7% |
| Winchester 760 | <<locked>> | 80% | 35,607 psi | 76% | 2063 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,208 psi | 53% | 1934 fps | 96.1% |
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 48 powders for .375 Fl. Mag. N.E. loaded with the .375 | 350gr | Woodleigh RN SN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,254 fps; across all powders the maximum-charge window runs from 1,360 fps to 2,254 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 48 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 78–90 %, 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. Alliant Reloder-23, Alliant Reloder-25, Hodgdon TrailBoss 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, Somchem S365, Vihtavuori N555 rank at the top here: for .375 Fl. Mag. N.E. 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.