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			Have you been using the same brass for all the loads, with the exception of the once fired brass?  It might be a problem with the brass. Exactly how that could be, I have no idea, but I tend to use the process of elimination when dealing with problems. Maybe try a powder other than IMR 4831.
		 
		
		
		
		
		
		
			
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				The pond, waterfowl, and yellow labs...it don't get any better.
			 
		
		
		
		
		
	
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