I'm happy when I can say "that" miss was me and not the gun. Man when you hit what your aiming at that's the best.
My most accurate air rifles are my Crosman NPSS in .22, which I worked on extensively to shoot 1" groups at 100 yards with 14.3 grain CPHP pellets at 800+ fps; and my RWS 350 Magnum in .22, which shoots less-than-1" groups at 100 yards with a new Vortek PG2 kit and muzzlebrake. My tuned CFXes in .22 are very accurate out to 75 yards as well.