There are no rules for plinking!!! No crying either!!!
The whole point to plinking is to plink, and to become more skilled at shooting. Run the gauntlet and shoot at all ranges from mere feet to 100 yards or more! Back in my Navy days as Lemoore Naval Air Station, I used to shoot at running jack rabbits with my Colt S.A. Army, 5 1/2 tube at 100 yards or more!!! I also used to draw and fire hitting pebbles on the ground from just in front of where I stood and beyond. It IS PLINKING, JUST DO IT as a Nike, Madison Ave. exec would say!!!!
I am still kicking my own backside for selling that one!!!!
Lighten up, and just have some good ole American fun with that gun ... SHOOT!