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The rifle is a 308 win and it is a new gun probably 40 rounds fired so far.
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I have a rifle that will close on a No Go gauge.
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Again, I have a rifle that will allow the bolt to close on a field reject length gage with .002" clearance. Not a problem, I use cases that are long from the shoulder to the case head, I also form 308 W cases from 30/06 cases. When forming to fit there is no way I can miss when off setting the length of the chamber with the length of the case. Again, I have two lengths, I have a length from the shoulder to the case head and I have a length from the end of the neck to the case head.
When forming 30/06 to 308 W remember the case body of the 30/06 becomes part of the shoulder and neck of the 308 W case. meaning the neck 'COULD' require neck reaming or neck turning. When forming 308 W cases for special chambers/military type chambers I find the thick neck off sets the generous chamber necks.
F. Guffey