Headspace question

[gun papa]

Do NM grade guns have tighter Chambers? I have a gun with a 1963 NM barrel. I have 1963 match rounds. When I disassemble the bolt and put a live match round in the chamber, the bolt lug will close all of the way with mild/ moderate thumb pressure. I have some standard 1942 ball where the bolt will almost close all of the way with moderate thumb pressure..

I just got some Clymer headspace gauges. Will they read okay with my tight chamber?
I really would like to shoot this thing. It's a beautiful gun. Just trying not to wreck it or me.

See imgur albums
Headspace/ bolt lug http://imgur.com/xxWV4m6

The gun. http://imgur.com/a/7Iy41DI

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