Thread: Old 30 cal.
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Unread 08-25-2011, 05:27 PM   #20
sheepherder
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Quote:
Originally Posted by glock30 View Post
It is a mark to indicate the gun was pressure tested with a cartridge at least 30 percent over it's normal pressure.
I don't know about Germany, but IIRC in the front of a Speer Reloading manual it said that US proof loads were 20% over...
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