Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 300gr | Barnes X S bullet and 40 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, 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% | 41,495 psi | 88% | 2228 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 41,379 psi | 88% | 2300 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 84% | 41,959 psi | 89% | 2224 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 41,945 psi | 89% | 2336 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 41,640 psi | 88% | 2247 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,090 psi | 89% | 2257 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 92% | 41,046 psi | 87% | 2300 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 40,973 psi | 87% | 2326 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,507 psi | 80% | 2264 fps | 97.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,017 psi | 87% | 2382 fps | 96.6% |
| Bofors RP3 | <<locked>> | 84% | 41,655 psi | 88% | 2257 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 84% | 42,380 psi | 90% | 2257 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 42,467 psi | 90% | 2290 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 42,293 psi | 90% | 2297 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,795 psi | 76% | 1447 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 41,495 psi | 88% | 2208 fps | 98.1% |
| IMR 4831 | <<locked>> | 94% | 42,221 psi | 90% | 2300 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 41,684 psi | 88% | 2218 fps | 99.4% |
| Lovex S065 | <<locked>> | 88% | 41,060 psi | 87% | 2211 fps | 95.7% |
| Norma 203B | <<locked>> | 82% | 41,510 psi | 88% | 2251 fps | 98.5% |
| Norma URP | <<locked>> | 92% | 41,118 psi | 87% | 2290 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 82% | 40,596 psi | 86% | 2257 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 77% | 1480 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 40,741 psi | 86% | 2333 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 40,814 psi | 87% | 2313 fps | 96.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,031 psi | 87% | 2316 fps | 96% |
| Rottweil R 903 | <<locked>> | 86% | 41,742 psi | 89% | 2254 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,060 psi | 87% | 2211 fps | 95.7% |
| Shooters World Precision | <<locked>> | 82% | 41,684 psi | 88% | 2218 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,177 psi | 89% | 2293 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 41,539 psi | 88% | 2152 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 42,482 psi | 90% | 2254 fps | 99% |
| Somchem S365 | <<locked>> | 96% | 41,872 psi | 89% | 2343 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 86% | 40,379 psi | 86% | 2198 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 90% | 40,480 psi | 86% | 2244 fps | 96.9% |
| Vihtavuori N540 | <<locked>> | 82% | 41,785 psi | 89% | 2215 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 42,351 psi | 90% | 2293 fps | 97.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,234 psi | 85% | 2326 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 40,567 psi | 86% | 2228 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,852 psi | 72% | 2254 fps | 97.3% |
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% | 39,262 psi | 83% | 2188 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,403 psi | 73% | 2165 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 37,405 psi | 79% | 2139 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,407 psi | 84% | 2283 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,101 psi | 79% | 2165 fps | 98.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,697 psi | 84% | 2215 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 34,621 psi | 73% | 2165 fps | 95.2% |
| Alliant Reloder-17 | 58.4 gr | 80% | 32,082 psi | 68% | 2133 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,807 psi | 67% | 2133 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,537 psi | 82% | 2333 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 36,912 psi | 78% | 2172 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 80% | 37,579 psi | 80% | 2169 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,284 psi | 64% | 2044 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,827 psi | 84% | 2251 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 57% | 1289 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,262 psi | 83% | 2169 fps | 97.6% |
| IMR 4831 | <<locked>> | 86% | 33,359 psi | 71% | 2129 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 39,465 psi | 84% | 2178 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 38,856 psi | 82% | 2169 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 39,102 psi | 83% | 2205 fps | 98.1% |
| Norma URP | <<locked>> | 86% | 34,563 psi | 73% | 2159 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 38,130 psi | 81% | 2211 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,108 psi | 58% | 1319 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,953 psi | 72% | 2188 fps | 99.1% |
| ReloadSwiss RS 62 | 64.2 gr | 88% | 36,129 psi | 77% | 2221 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,551 psi | 82% | 2264 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 34,940 psi | 74% | 2126 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,856 psi | 82% | 2169 fps | 95.1% |
| Shooters World Precision | <<locked>> | 80% | 39,465 psi | 84% | 2178 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,273 psi | 75% | 2159 fps | 96.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,072 psi | 79% | 2077 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,723 psi | 76% | 2129 fps | 97.6% |
| Somchem S365 | 55.4 gr | 80% | 26,426 psi | 56% | 1991 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 33,808 psi | 72% | 2073 fps | 98.3% |
| Vihtavuori N160 | <<locked>> | 86% | 36,071 psi | 77% | 2159 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 39,392 psi | 84% | 2175 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 35,491 psi | 75% | 2165 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 92% | 32,068 psi | 68% | 2159 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,110 psi | 64% | 2008 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,197 psi | 64% | 2152 fps | 95% |
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 | Barnes X S. Alliant Reloder-26 delivers the highest muzzle velocity at 2,382 fps; across all powders the maximum-charge window runs from 1,447 fps to 2,382 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 72–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.375" calls for a 1:16.5 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. Somchem S365, Alliant Reloder-17, ReloadSwiss RS 62 rank at the top here: for .375 Fl. Mag. N.E. with the .375 | 300gr | Barnes X S 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.