As some may have noticed, I've posted comments on a custom Mauser chambered to the 7x57 that gives pressure problems right quick like. Day before yesterday I did a trial at the range trying seating depth to see if I could find a sweet spot with the Nosler ABLR and when I got home did a little bit of measuring comparing the neck on a loaded round and on new brass against the necks on the fired brass. The average difference on five measured cased came out to .0034" Assuming, yeah I know what that means, that allowing for brass spring back probably the neck portion of the chamber is at or close to .0040". Based on that assumption, that means there is only .0020" clearance for the circumference of the neck to expand to let the bullet fly free. I guess my question os that small amount enough or should the neck portion of the chamber be slightly larger. I guess I should add that the chamber itself it also very tight. Any ideas? I really want to hunt this rifle this year but not until I get this problem sorted out.
Paul B.
