My daughter shoots a Beretta 391 mobile. She shoots from the 16 yard. She has a Briley Mod. choke that was fitted to her barrel now. We patterned the gun at 32 yards with three different loads and found consistently 2-3 clay sized holes in the center of the pattern. I have heard that different chokes work better in certain guns. I don't want to buy a bunch of chokes to find a good one. I am thinking of switching to a LF or Full. Does anyone have any good experiences with a certain choke in a 391 mobile?