This is true story. A friend of mine that hunts every now and then with me was useing a full choke in his benneli shot gun, we had talked about the different kinds of chokes before but never talked about useing a full choke in a shot gun for waterfowl, we use 3 1/2 bb for geese. When we got to the spot we were going to hunt we had everything set up,waited for a while and in come the geese, I called them in close to us and yelled out take them, we both started to shoot and then I heard a strange noise from his gun, we looked at it in side and out but never looked at the end of the gun. We sat down in the blind and upon putting our guns in the rack I noticed that the end of his berrel looked different,we took a closer look at it and found that with useing 3 1/2 bb with a full choke it pulled the choke out of his gun. ruend the berrel of his gun, I then ask him what were you useing in there, he said a full choke. Well I then went to a gun smith in the naborhood and ask him why, he then said the full pattern of the choke and using 31/2 bb was just to much for the choke. We now know by a very expesive misstake that you should not use a full choke tube with steel shot at all.It would have been different with led but I have used them for years and nothing like this ever happened to me. Well we found out the hard way. The morral of this is do not use full choke on steel bigger than number 2 like bb,bbb,t and f. We just can't see how it pulled the choke out of the gun, the gun smith was puzled a little with it and said its a big shot for a little hole. A fellow on a different site said that it can bulge the berrel to. So you might want to check with a gun smith and ask questions.