so a couple of weeks ago I was looking at a 10 mm /16 twist barrel blank and thought that it would be a different small Martini project .
Run some 41 rem mag brass through a set of 40sw/10mm and they sized down quite easily and made up a couple of dummies
It just fits into the because I can category as the brass being 41 mag and be easier to load for with out sizing ,but a rimmed 40 on a martini seems intriguing during this quiet time