Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 300gr | Woodleigh PP SN bullet and 40 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 62.
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 4064 | <<locked>> | 82% | 40,466 psi | 86% | 2264 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 41,698 psi | 88% | 2356 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 84% | 42,032 psi | 89% | 2277 fps | 98.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 42,337 psi | 90% | 2398 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 41,771 psi | 89% | 2300 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,134 psi | 89% | 2313 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 92% | 41,263 psi | 88% | 2362 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 88% | 41,205 psi | 87% | 2385 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,652 psi | 80% | 2323 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,611 psi | 88% | 2454 fps | 97.7% |
| Bofors RP3 | <<locked>> | 84% | 41,495 psi | 88% | 2306 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 42,409 psi | 90% | 2313 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 40,611 psi | 86% | 2313 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,418 psi | 75% | 1480 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 41,655 psi | 88% | 2264 fps | 98.6% |
| IMR 4831 | <<locked>> | 92% | 39,987 psi | 85% | 2310 fps | 97.8% |
| Lovex S062 | <<locked>> | 82% | 41,452 psi | 88% | 2267 fps | 99.6% |
| Lovex S065 | <<locked>> | 88% | 40,901 psi | 87% | 2264 fps | 96.4% |
| Norma 203B | <<locked>> | 82% | 41,452 psi | 88% | 2303 fps | 99% |
| Norma URP | <<locked>> | 92% | 41,626 psi | 88% | 2349 fps | 98% |
| Ramshot Big Game | <<locked>> | 82% | 40,901 psi | 87% | 2313 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 92% | 40,669 psi | 86% | 2339 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,897 psi | 76% | 1516 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,104 psi | 87% | 2392 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,220 psi | 87% | 2372 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,466 psi | 88% | 2382 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 86% | 41,553 psi | 88% | 2303 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 40,901 psi | 87% | 2264 fps | 96.4% |
| Shooters World Precision | <<locked>> | 82% | 41,452 psi | 88% | 2267 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,656 psi | 90% | 2349 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 41,756 psi | 89% | 2201 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,351 psi | 90% | 2306 fps | 99.4% |
| Somchem S365 | <<locked>> | 96% | 42,351 psi | 90% | 2402 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 40,393 psi | 86% | 2247 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 90% | 40,988 psi | 87% | 2303 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 82% | 41,785 psi | 89% | 2264 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 40,118 psi | 85% | 2306 fps | 97.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,770 psi | 86% | 2385 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 40,857 psi | 87% | 2287 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,576 psi | 71% | 2316 fps | 98.3% |
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 4064 | <<locked>> | 80% | 38,116 psi | 81% | 2224 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 31,676 psi | 67% | 2159 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 37,260 psi | 79% | 2188 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,537 psi | 84% | 2346 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,796 psi | 78% | 2211 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,566 psi | 84% | 2264 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,343 psi | 69% | 2169 fps | 95.1% |
| Alliant Reloder-17 | 63.5 gr | 80% | 31,604 psi | 67% | 2178 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 29,631 psi | 63% | 2136 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 36,216 psi | 77% | 2343 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 36,260 psi | 77% | 2211 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 80% | 37,217 psi | 79% | 2215 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,920 psi | 59% | 2037 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 56% | 1319 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,117 psi | 83% | 2218 fps | 98.1% |
| IMR 4831 | <<locked>> | 86% | 32,953 psi | 70% | 2169 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 38,957 psi | 83% | 2221 fps | 99.4% |
| Lovex S065 | <<locked>> | 86% | 38,450 psi | 82% | 2218 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 38,928 psi | 83% | 2254 fps | 98.5% |
| Norma URP | <<locked>> | 84% | 32,227 psi | 68% | 2159 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 38,218 psi | 81% | 2264 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 38,276 psi | 81% | 2290 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,731 psi | 57% | 1352 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,649 psi | 71% | 2238 fps | 99.5% |
| ReloadSwiss RS 62 | 68.2 gr | 86% | 33,678 psi | 71% | 2221 fps | 95.3% |
| ReloadSwiss RS 70 | 71 gr | 88% | 36,361 psi | 77% | 2277 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 34,156 psi | 72% | 2162 fps | 98% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,450 psi | 82% | 2218 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 38,957 psi | 83% | 2221 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,186 psi | 75% | 2208 fps | 97.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,825 psi | 78% | 2123 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,172 psi | 75% | 2172 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 25,512 psi | 54% | 2024 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 33,315 psi | 71% | 2116 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 33,692 psi | 71% | 2162 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 39,305 psi | 83% | 2221 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,098 psi | 70% | 2165 fps | 95% |
| Vihtavuori N555 | <<locked>> | 92% | 31,589 psi | 67% | 2198 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,588 psi | 63% | 2051 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,631 psi | 63% | 2201 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 40 powders for .375 Fl. Mag. N.E. loaded with the .375 | 300gr | Woodleigh PP SN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,454 fps; across all powders the maximum-charge window runs from 1,480 fps to 2,454 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 40 of the 40 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 300.0 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-26, 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. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 62 rank at the top here: for .375 Fl. Mag. N.E. with the .375 | 300gr | 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.