I have been trying to locate the source for getting a chambering reamer made up so as to allow getting 303 cases necked up for 375 bullets. I've seen the 375 2 1/2 but not the one I'm looking for.
What I would like is to neck up 303 cases and have them accept 375 jacketed and cast bullets. Since I already have a Lyman mold in 375 caliber that takes gas checked bullets I would like to start with the cast bullets first. But the problem is trying to find the reamer with which to chamber the barrel.
Has anyone heard about something like this being dome. I'd have to slug the barrel to get land and groove diameters and go from there. Id appreciate any help you gents can give me. Thanks Frank