I no longer trust my Carlson's choke tubes to provide appropriate constrictions to match their markings. My set for a 20 gauge Beretta measures a full choke constriction tighter than how they are marked. For example both Skeet chokes measure 0.010" constriction, what would be normal for Improved Cylinder. This miss-marking or miss-boring is consistent across the set, right up to Full. OTOH, I'm very happy with my Briley chokes tubeslI'd like to pick up a Light Modified choke for my Beretta A400 Xcel Sporting, but wasn't sure what to try. I've got a Muller Skeet choke that has been great. Never tried Briley or Xtreme.