The first thing I do when I buy any gun is clean the barrel then start testing pellets, the bench mark for springers is RWS super domes, for pcp, AA field, with pistols I start with RWS geco, it's just a process of getting hold of as many brands as you can and shooting them after I have put a 100 or so pellets through it to lead the barrel. Then i only clean the barrel if the grouping of the chosen pellets start to open up (could take years)