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			Catfish, 
Are you saying that the same powder charges are operating at the same pressure between the two different cases?  I would think the pressure is lower in the larger case, hence the decrease in velocity of the projectile.  Or am I wrong thinking that there is a direct relationship between pressure and velocity? 
 
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Steve
		 
		
		
		
		
		
		
			
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				sandman
			 
		
		
		
		
		
	
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