That feller knows his guns real good, alright.
Both 7.62 by ...
51 - 54, difference of three, whatever - don’t matter.
Well, the Crusaders were a little loose with their tolerances on bore size.
You, and at least one other FReeper on this thread, have no sense of humor. The guy is a comedian, one with a straight faced delivery. You should have figured that out at least by the time he was showing you his “wind gauge” on his hat.
It ABSOLUTELY does matter! Improper Head spacing is a deadly error.
Not only that the Mosin is pure junk. Poorly engineered tooling, sloppy cambering standards, not to mention, sub standard and inconsistent steel used in manufacture.
Countless numbers of these “cheap” excuses for a rifle have blown up in their owners faces.