It's good advise. Though I ran into an interesting situation while trapshooting. I shot one weekend at Leadville, CO. I was at 27 yards at that time but in Leadville I was lucky to hit a target or two. After the shoot driving down the road I realized the problem: I had the choke in the gun that I usually use at 2500 feet altitude in AZ. Leadville club is at 10,000 ft.! So it's fair to say I was not right on with my K-80 "rifle" that weekend.