Estimate chamber pressure and muzzle velocity for the 375 Winchester with the free, in-browser MyLoads internal-ballistics simulator. The figures below are illustrative estimates from a physics model — not a recommended recipe. Always cross-check a current published loading manual.
| Maximum average pressure (MAP) | 52,000 CUP |
|---|---|
| Nominal case capacity | 48.0 gr H₂O |
| Groove / bullet diameter | 0.375 in (9.52 mm) |
Muzzle velocity
Peak chamber pressure (interval, ±10% burn-rate)
maximum average pressure for this cartridge is specified as 52,000 CUP (CUP is not directly comparable to this psi estimate)
Illustrative example — every figure is an estimate; always confirm your load against a current published manual before loading.
Use MyLoads as a 375 Winchester velocity and pressure calculator: it estimates muzzle velocity, muzzle energy and the full chamber-pressure curve for your own powder, charge and barrel length, compared against the reference facts above.
Open the 375 Winchester in the MyLoads calculator →