My SXS 16ga. has two chokes....light and tight...(-: IC/Full, Few escape its wrath...Wild Kansas pheasants require good solid hits, with one down and one fleeing fast choke is a wonderfull thing! IC/F is even good for sporting clays too. I have found that proper choke matched to the range of the target is a must for best resalts! Example...Are clubs sporting clays corse has a fair mix of presintations. If I shoot IC/M for all stations my score will be about the same as if shot them all with M/F chokes give or take a couple targets. If I taylor the choke to the presintation my scores go up noticably. Proper choke is very important. Paterns can also be altered by load type. While testing a Fox SXS 16 one load realy filled the circle at 40 yards??? I tor down this load and found a solid wad cup with no verticle slits. This load is a factory Noble sport hunting 16ga load. Don't use this load for early grouse! Thanks all Kenny Graft SXS ohio....(-: