yes ~30 miles for 1940 it's good range
in 1992 Sadam H.army used new rail gun (in pic.) designed by Gerald Bull with 500-600 miles range.
that was destroyed by US army after first shot.
i don't know if this particular barrel stronger ,but more easy to make perfect fit with this type of lockup than on regular 1911 platform . accuracy is a function of many factors that need to be fitted together perfectly.