I mounted a scope that I had laying around onto a Ruger 10/22. Found it at a garage sale for a couple bucks, Nothing good, an old Simmons 3-9 or something cheap.
Anyway, went out to the picnic table , just leaning on the table, and set a box out at 50 yards. 1st 3 shots were about an inch left. Adjusted and shot again and had all three right where I wanted them.
Couldn't have been easier. Shot a couple ten shot groups at various ranges out to 75 yards, wiped it down and put it back away . Guess this garage sale scope was meant to find it's way to me.
-Jake