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			The .300 Whisper is a .221 case necked up to .30 cal. so they are the same thing. I have a .25 cal. on the .221 case but never messed with sub-soinc loads with it. You do realize you need a class 3 license for the rifle your talking about building.
		 
		
		
		
		
		
		
			
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				Catfish
			 
		
		
		
		
		
	
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