When I taught rifle and shotgun at 7Ranges we did not mess with adjusting sights on the rifles. An average week had 50 to 60 scouts in the rifle class plus a few hundred using the range during open program with maybe 2 dozen reliable rifles. During staff week I shot 5 shot groups with them all to make sure they were on paper at 50 feet (pretty easy to do) and then called it a day.
The rifles were mostly Marlin 925s so the sights are not very easily adjustable anyways. Sadly the schmuck who took over after the year I worked there caved into requests from the camp director to "up" the rifle passing rate so they put 4x scopes on the rifles.
I'm sorry but if you can't put 5 shots into a quarter sized group with a .22 off the bench at 50 FEET you do not deserve a badge of "merit" for rifle shooting.
Shotgun was pretty simple as well. Clays tossed from the shooters right at a 45' angle with a cheap mechanical thrower. Guns were H&R 20s and a couple 870s also in 20 GA.
I always stressed to the scouts I wanted them to shoot safely, correctly and accurately, in that order. I hope that rile and shotgun merit badge are still around 25 years from now when I retire from the FD because I would love to go back and teach again.
FFMedic
PS, Grayrider, don't feel too bad. The camp I worked at for 4 years averaged 500 scouts a week for 8 weeks. Swimming and lifesaving merit badges and our camps swimming requierment for the camp honers award made many a scout stumble and hopefully resolve to do better next year if not sooner. For me at least the 10 mile compass course was a breeze compared to the swimming rescue drills