Aside from routine cleaning and making sure the screws remain snug, I haven't done a thing with my new RWS 34 .22 besides shoot it almost everyday. It just keeps getting better and better! I don't weigh or mic my pellets, and do get an occasional flyer, but it's shooting on average, 15shot, 1/2" groups at 25yds. (scope on 5X). It's very satisfying looking down range at the trap and seeing these 1/2" ragged holes with the naked eye. RWS Super Domes shoot 1/2" groups with a bit more consistency than the Crosman HP's, but cost twice as much, so I'm doing most of my shooting with the Crosman HP's I get at wally world.
I realized I was wasting good lead by shooting into a backstop, so I welded a trap together, it'll take a .38 Spl. easily so .22 pellets are no problem. The shooting opening is 10X12" with four nails welded to the face to press a piece of card board over the opening then targets get fixed on the cardboard. I'll see if I can get pictures of the trap posted later. (made of scrap steel I found lying around)