Embarrased to Ask-Newbie in Benelli Posted December 30, 2006 cylinder - cylinder choke - no constriction improved cylinder - I think its about 0.005 constriction - tighter than cylinder Modified - tighter than improved cylinder improved modified - tighter than modified, less than full f= full - tighter than modified, but there are tighter chokes made. for trap you will probably want improved modified or full due to the extended ranges. Skeet you will do better with improved sylinder or cylinder due to the close ranges. when shooting clays/ birds/shot pellets at anything I pretty much leave the modified choke in and not mess with it... Opinions vary on use of chokes. I'd probably change between trap and skeet, but you could shoot a modified for both and probably not hurt yourself much.