Trapshooting is longrange shooting with a shotgun. Even singles or doubles at 16 yds., the average shooter is trying to break birds at 30-35 yds. from the traphouse. When you move back on the handicap shoots, the distance becomes even greater. MOST of the guys I have shot with use Full choke. That is what I use too. It's important to know what your trap gun likes to shoot best, also. Like your rifle. Check your gun for patterning at 30 yds. You definitely don't want a shot pattern with a big hole in it. Shot size can play a big role here too. Some guns will shoot 7 1/2 good, some like #8's better. I just advised a shooter on another forum to keep their head down tight to the stock. Too many people want to raise their head off the stock at the shot to see the bird break. Nearly always results in a miss. By far, however the most important thing is practice, practice, practice....