Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 300gr | Barnes Solid 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-16, Somchem S365 and Alliant Reloder-17.
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 2495 | <<locked>> | 82% | 40,712 psi | 86% | 2221 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 40,915 psi | 87% | 2257 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 41,829 psi | 89% | 2343 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 84% | 40,393 psi | 86% | 2231 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 40,335 psi | 86% | 2339 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 42,366 psi | 90% | 2293 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 40,161 psi | 85% | 2257 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 94% | 41,901 psi | 89% | 2352 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 90% | 41,742 psi | 89% | 2375 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,636 psi | 76% | 2260 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,247 psi | 83% | 2385 fps | 96.5% |
| Bofors RP3 | <<locked>> | 86% | 41,916 psi | 89% | 2300 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 40,306 psi | 86% | 2257 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 40,828 psi | 87% | 2297 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 40,611 psi | 86% | 2300 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,186 psi | 75% | 1457 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 42,467 psi | 90% | 2260 fps | 98.5% |
| IMR 4831 | <<locked>> | 94% | 40,263 psi | 85% | 2300 fps | 97.5% |
| IMR 4895 | <<locked>> | 82% | 41,147 psi | 87% | 2287 fps | 98.7% |
| Lovex S062 | <<locked>> | 84% | 42,177 psi | 89% | 2260 fps | 99.6% |
| Lovex S065 | <<locked>> | 90% | 41,365 psi | 88% | 2251 fps | 96.2% |
| Norma 203B | <<locked>> | 84% | 42,047 psi | 89% | 2297 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 42,018 psi | 89% | 2339 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 84% | 41,640 psi | 88% | 2310 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,679 psi | 76% | 1493 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 41,872 psi | 89% | 2349 fps | 98.4% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 41,684 psi | 88% | 2382 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 41,597 psi | 88% | 2362 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 42,192 psi | 90% | 2372 fps | 96.8% |
| Rottweil R 902 | <<locked>> | 82% | 41,684 psi | 88% | 2234 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 88% | 42,032 psi | 89% | 2293 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 41,365 psi | 88% | 2251 fps | 96.2% |
| Shooters World Precision | <<locked>> | 84% | 42,177 psi | 89% | 2260 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 40,582 psi | 86% | 2297 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 42,395 psi | 90% | 2198 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 40,277 psi | 85% | 2254 fps | 98.9% |
| Somchem S365 | <<locked>> | 96% | 39,943 psi | 85% | 2346 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 40,930 psi | 87% | 2218 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 41,495 psi | 88% | 2224 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 40,959 psi | 87% | 2241 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 92% | 41,379 psi | 88% | 2293 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 42,540 psi | 90% | 2260 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 40,495 psi | 86% | 2297 fps | 97.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,334 psi | 81% | 2326 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 41,713 psi | 88% | 2280 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,734 psi | 67% | 2241 fps | 96.8% |
| Winchester StaBALL Match | <<locked>> | 82% | 42,351 psi | 90% | 2293 fps | 99.2% |
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 2495 | <<locked>> | 80% | 38,159 psi | 81% | 2178 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 36,085 psi | 77% | 2172 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 34,098 psi | 72% | 2198 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 35,592 psi | 76% | 2139 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,768 psi | 80% | 2287 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,012 psi | 74% | 2159 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,594 psi | 80% | 2211 fps | 97.4% |
| Alliant Reloder-16 | 61.9 gr | 88% | 35,027 psi | 74% | 2211 fps | 95.8% |
| Alliant Reloder-17 | 60.6 gr | 80% | 30,211 psi | 64% | 2126 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,863 psi | 63% | 2123 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,593 psi | 78% | 2326 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 34,505 psi | 73% | 2162 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 80% | 35,462 psi | 75% | 2162 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,979 psi | 64% | 2073 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,985 psi | 81% | 2254 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 56% | 1302 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,347 psi | 79% | 2169 fps | 97.4% |
| IMR 4831 | <<locked>> | 88% | 33,228 psi | 70% | 2162 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 38,493 psi | 82% | 2238 fps | 98.2% |
| Lovex S062 | <<locked>> | 80% | 37,289 psi | 79% | 2175 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 38,986 psi | 83% | 2208 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 36,985 psi | 78% | 2201 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 34,737 psi | 74% | 2201 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 36,405 psi | 77% | 2211 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,455 psi | 56% | 1332 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,088 psi | 83% | 2297 fps | 97.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,169 psi | 68% | 2185 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,127 psi | 72% | 2215 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 39,378 psi | 84% | 2320 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 39,146 psi | 83% | 2188 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 32,416 psi | 69% | 2113 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 38,986 psi | 83% | 2208 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 37,289 psi | 79% | 2175 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,373 psi | 71% | 2156 fps | 96.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,215 psi | 75% | 2077 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 33,475 psi | 71% | 2119 fps | 97.3% |
| Somchem S365 | 58.9 gr | 82% | 25,788 psi | 55% | 2018 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 38,348 psi | 81% | 2175 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,972 psi | 83% | 2182 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,720 psi | 67% | 2067 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 34,200 psi | 73% | 2159 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 37,521 psi | 80% | 2175 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 35,679 psi | 76% | 2205 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 31,647 psi | 67% | 2185 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,153 psi | 64% | 2047 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,805 psi | 63% | 2185 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,668 psi | 84% | 2247 fps | 98.8% |
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 | 300gr | Barnes Solid. Alliant Reloder-26 delivers the highest muzzle velocity at 2,385 fps; across all powders the maximum-charge window runs from 1,457 fps to 2,385 fps. Alliant Reloder-23 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 67–90 %, 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. Alliant Reloder-16, Somchem S365, Alliant Reloder-17 rank at the top here: for .375 Fl. Mag. N.E. with the .375 | 300gr | Barnes Solid 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.