Shotgun chokes?

28" barrel is considered long by many. I always liked the 26" I know many that use the 28" and switch chokes to shoot trap. The choke is to taper the end of the barrel to concentrate the shot to a tighter pattern. I use an improved cylinder choke for skeet and either a modified or full choke for trap. The improved cylinder gives the largest spread short of just cutting the end off the barrel. That would be open cylinder. The modified is a tighter pattern and the full is used when you need to reach out further. For Skeet I like to use #9 shot and for trap 7-1/2 shot. If you are comfortable with a 28" barrel keep with it. Many say I should use a semi-auto or over and under. I perfer the 870. The pump has always been the best for me.