If you are shooting Skeet for fun you can shoot what ever you like. If you are trying to become an All-American you will use a O/U with tubes. And yes there are a very few people who could shoot a zip gun and break birds. I am not one of them much to my regret. So I grab what ever gun screams the loudest in the gun room and take the correct shells for her. It is a date not a marriage so it is not cheating on the others.