Take a new brass, put one layer of cellophane tape on head and place in action, close bolt.
Screw new barrel down to contact, tighten nut down. This is go gage.
If you place another piece of tape on brass, bolt shoulder not quite close. This is no-go gage.
As shown to me by long time gunsmith.
Alternative, use new loaded round. Only do this outdoors for obvious reason.
Larry
Tinkerer
Don't shoot me, I'm only the messenger.
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