Load Specifications
Load data in caliber .375 Fl. Mag. N.E. with .375 | 270gr | Barnes X S bullet and 42 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 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 2495 | <<locked>> | 82% | 41,771 psi | 89% | 2336 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 41,698 psi | 88% | 2369 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 41,582 psi | 88% | 2438 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 86% | 42,525 psi | 90% | 2365 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 42,583 psi | 90% | 2480 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 42,090 psi | 89% | 2392 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 84% | 42,424 psi | 90% | 2398 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 94% | 41,394 psi | 88% | 2434 fps | 96.4% |
| Alliant Reloder-17 | <<locked>> | 90% | 41,394 psi | 88% | 2464 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,621 psi | 76% | 2343 fps | 96% |
| Bofors RP3 | <<locked>> | 86% | 42,076 psi | 89% | 2402 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 40,524 psi | 86% | 2388 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 40,161 psi | 85% | 2392 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,505 psi | 75% | 1539 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 42,119 psi | 89% | 2352 fps | 97.4% |
| IMR 4831 | <<locked>> | 96% | 42,366 psi | 90% | 2434 fps | 96.7% |
| IMR 4895 | <<locked>> | 82% | 40,930 psi | 87% | 2382 fps | 97.6% |
| Lovex S062 | <<locked>> | 84% | 42,177 psi | 89% | 2359 fps | 98.9% |
| Norma 203B | <<locked>> | 84% | 41,756 psi | 89% | 2388 fps | 97.8% |
| Norma URP | <<locked>> | 94% | 41,408 psi | 88% | 2425 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 84% | 41,104 psi | 87% | 2398 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 76% | 1572 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 41,278 psi | 88% | 2438 fps | 97.1% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 41,191 psi | 87% | 2474 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 40,988 psi | 87% | 2444 fps | 95.8% |
| Rottweil R 902 | <<locked>> | 82% | 41,959 psi | 89% | 2333 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 88% | 41,930 psi | 89% | 2392 fps | 98.4% |
| Shooters World Precision | <<locked>> | 84% | 42,177 psi | 89% | 2359 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 42,641 psi | 90% | 2434 fps | 97.8% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 42,583 psi | 90% | 2382 fps | 97.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 42,032 psi | 89% | 2293 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 40,306 psi | 86% | 2349 fps | 97.9% |
| Somchem S365 | <<locked>> | 98% | 42,003 psi | 89% | 2480 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 82% | 40,828 psi | 87% | 2323 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 41,263 psi | 88% | 2323 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 88% | 40,712 psi | 86% | 2336 fps | 99% |
| Vihtavuori N160 | <<locked>> | 92% | 40,857 psi | 87% | 2382 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 84% | 42,409 psi | 90% | 2362 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 94% | 42,583 psi | 90% | 2431 fps | 96.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,029 psi | 81% | 2415 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 41,205 psi | 87% | 2365 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 82% | 41,916 psi | 89% | 2388 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 2495 | <<locked>> | 80% | 39,392 psi | 84% | 2297 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,173 psi | 79% | 2283 fps | 99.7% |
| Accurate 4350 | <<locked>> | 92% | 38,870 psi | 82% | 2385 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 35,665 psi | 76% | 2228 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 37,594 psi | 80% | 2372 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,215 psi | 75% | 2254 fps | 96.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,652 psi | 80% | 2303 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 92% | 39,146 psi | 83% | 2388 fps | 95.6% |
| Alliant Reloder-17 | 63.7 gr | 84% | 34,476 psi | 73% | 2313 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 98% | 33,750 psi | 72% | 2293 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 35,027 psi | 74% | 2260 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 32,285 psi | 68% | 2208 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,739 psi | 80% | 2346 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,556 psi | 56% | 1371 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,318 psi | 79% | 2257 fps | 96% |
| IMR 4831 | <<locked>> | 92% | 37,579 psi | 80% | 2343 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 38,522 psi | 82% | 2333 fps | 97% |
| Lovex S062 | <<locked>> | 80% | 37,637 psi | 80% | 2274 fps | 98% |
| Norma 203B | <<locked>> | 80% | 37,144 psi | 79% | 2297 fps | 96.6% |
| Norma URP | <<locked>> | 92% | 39,088 psi | 83% | 2382 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 36,260 psi | 77% | 2300 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,948 psi | 57% | 1407 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 38,696 psi | 82% | 2388 fps | 96.4% |
| ReloadSwiss RS 60 | 60.7 gr | 80% | 32,401 psi | 69% | 2270 fps | 97.6% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 38,609 psi | 82% | 2398 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 39,653 psi | 84% | 2290 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 80% | 33,025 psi | 70% | 2211 fps | 96% |
| Shooters World Precision | <<locked>> | 80% | 37,637 psi | 80% | 2274 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,518 psi | 71% | 2244 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,074 psi | 85% | 2333 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,317 psi | 75% | 2172 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 33,939 psi | 72% | 2218 fps | 96% |
| Somchem S365 | 61.8 gr | 86% | 29,646 psi | 63% | 2198 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 38,406 psi | 81% | 2280 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,899 psi | 83% | 2280 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 32,097 psi | 68% | 2162 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 90% | 38,566 psi | 82% | 2336 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 37,550 psi | 80% | 2274 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 92% | 40,248 psi | 85% | 2385 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 98% | 35,897 psi | 76% | 2369 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 32,489 psi | 69% | 2178 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,421 psi | 84% | 2339 fps | 97.7% |
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 42 powders for .375 Fl. Mag. N.E. loaded with the .375 | 270gr | Barnes X S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,480 fps; across all powders the maximum-charge window runs from 1,539 fps to 2,480 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 42 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (325 MPa), the top charges use 75–90 %, leaving at least 10 % headroom. The 270.0 gr projectile in 0.375" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Hodgdon TrailBoss, ReloadSwiss RS 14 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 60, Alliant Reloder-17, Somchem S365 rank at the top here: for .375 Fl. Mag. N.E. with the .375 | 270gr | 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.