I have also shot cylinder bore guns in 12 and 20 gauges, and thought that they were adequate for skeet, but they won't give you that confidence building smoke puff that tighter constrictions will, and confidence is at least 5% of the final score.
Amen, brother. Sometimes a lot more than 5%. I'm not a skeet shooter, having only shot maybe ten rounds in my life, but the same statement holds true for sporting clays. There's nothing much prettier in shooting than a falling chandelle that literally "goes away" from a dense centered pattern.
Stan