Estimate chamber pressure and muzzle velocity for the 256 Winchester Magnum 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) | 3,500 BAR |
|---|---|
| Nominal case capacity | 21.5 gr H₂O |
| Groove / bullet diameter | 0.256 in (6.50 mm) |
Muzzle velocity
Peak chamber pressure (interval, ±10% burn-rate)
nominal is 68% of the 50,763 psi maximum average pressure
Illustrative example — every figure here is an estimate and can be wrong. Always consult a current published loading manual, and never trust these numbers on their own.
Open the 256 Winchester Magnum in the MyLoads calculator →