Never used to like extended choke tubes but everyone was using them and not needing tools to change them was nice. Always used semi autos and slot ported comp-n-chokes have always worked great and patterned great for me. I recently got into sporting clays and got an over/under. Went to pattern the chokes and two brands of non-ported extended chokes pattern as expected but the bottom barrel is hitting high left when using the slot-ported comp-n-choke. Have not tried the top barrel. Wondering if the porting is causing some upward swing since the top ports on the bottom barrel are obstructed by the bottom of the upper barrel chokes? What do you guys think, is it all in my head?