I went through the same reasoning with my 16Ga CSM '21' that was choked Skeet and 0.015. These chokes were fine for our clubs 5 Stand and skeet; however, the SC course that we normally shoot at keeps presenting longer targets. My barrels are now at Briley getting thin wall/flush mounted steel/tungston chokes installed. I ordered 0.005, 0.010, .015, 0.020, and 0.025 tubes. I'm not a choke fiddler. When I owned a K80 and K20, I'd screw in the chokes that I needed for the day and left them in place - it worked for me.