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					Originally Posted by  Dave Purnell
					 
				 
				First, bore is measured in inches.  18 millimeters is .709 inch.  I don't know what that means, except it's probably smaller than a 12ga gun.  Accurate bore and chamber dimensions will have to be taken with a gage that can measure in thousanths of an inch. 
			
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 Thanks, Dave--that's what it's going to take!