Got my Beretta 686 Onyx and did a 16yd pattern test. The O/U has the mobile chokes - Improved Cylinder top and Full on the bottom. I used Winchester AA trap loads of #8 shot @ 1200 fps. First shot with the IC gave me a spread of 16" with thinly sparsed flyers out to 23". The full choke had a high density area of 10" fading out to 13". I'm not happy with the IC results and am seriously considering changing it to either Improved modified or modified. 20 years ago when I last shot trap, my 870 and 1100 both had full chokes. Should I go to Full? I may shoot doubles and handicap (never done that before). I've read that a lot of you claim the more open a choke is the sloppier you get. I don’t want that to happen. I also don’t want to buy every possible choke. The chokes I have now are flush with the muzzle - what about the extended tubes. Is there an advantage other than being able to change them without a tool and looking pretty?