Guess it depends on how you see a 16, light 12 or a heavy 20.   For targets 3/4 is easier on the stock and plenty of shot in a tight choked gun to break clay clay targets at moderate distances .  Birds another thing You need to kill clean.  
 
Other day patterned my Berretta O/U with Lt Mod tubes that usually runs 1 oz Factory 1200 fps with 7/8 oz 1150 fps 12 G reloads intended for Parkers. Looking at the paper can't see any reason to use 1 oz over 7/8 to 35 yards. Longer 1 oz and Modfied choke tubes better for sure.   
 
The DR 16 is perfect for 7/8 in 2 3/4 hulls.   Bit long for 7/8 in 2 1/2 
 
William.
		 
		
		
		
		
		
		
		
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