You also have to ask what type of motor it was.

If it was a race motor where your stuffing 30+ psi down it, or a 3 stage nitrous set up puttin out a 600 shot, or a huge ci motor then yes ring gap comes into play in those situations. You have to accomodate of stuff like ring flutter, the rings butting up against the ends, ect.

But you a 306 with a 100 shot you will be know where close to having these types of problems.