Quote:
	
	
		
			
				
					Originally Posted by  Jack Hamner
					 
				 
				Thanks, Dave for this valuable information.  So the figures Mr. J. arrived at are within the tolerances for a 12b identification on the gun? 
 
(.765-.770 Parker Story) 
(.770-.761 Measured readings) 
			
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 I would think 12b.  There is no other chamber size close.