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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 again, Dave.  I was just using centimeters because they're easier to read on a ruler than trying to figure out hundredths or thousandths of an inch on the ruler.  Obviously, the ruler is not an accurate enough measurement.  I was just using what I had for a rough guesstimate until I can find something else.  Thanks for all your help!  Jack.