OK, I do not have the proof mark answer.

Here is what I would try. Will the bolt
close on a 30-06 round?


If No, will the bolt close on an 8mm mauser round?
If Yes, is the bolt face opened up to a Brenneke diameter?

https://en.wikipedia.org/wiki/9.3%C3%9764mm_Brenneke

Of course, the chamber cast in a few weeks is the good answer.


Last edited by skeettx; 02/11/20 07:47 AM.
USAF RET 1971-95 [Linked Image from jpgbox.com]