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				It depends
			 
			 
			
		
		
		
			
			A decent bore should clean up and shine like a new dime.  If the barrel is rusted, pitted or corroded (from shooting corrosive ammo and not properly cleaned), then it can be a real challenge.  Some bores may never clean up.  So, it depends.  All the best... 
Gil
		 
		
		
		
		
		
		
		
		
	
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