As some of you have probably seen in my other thread, I am new to shotgun sports and currently in the market for a quality O/U. In my search I am looking at used guns as an option. My question is how many rounds can be expected to go through a gun? What is a low round count? A high count? I'm sure this has been discussed in the past, so I apologize if I am bringing up old discussion. As always, thanks for your input.