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				Barrel Length
			 
			
			
			Does anyone know of a good program that plugging in the caliber, bullet length,bullet weight,  twist, and powder that will provide the optimum barrel length. 
		
		
		
		
		
		
		
		
	
	For the that matter, the correct twist. I desire to build a 243ACK built for 85-87 grain bullets. Thanks  | 
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