Depends on the gun. 22LR's are very ammo sensitive, try a bunch of different stuff. Good place to start is Eley Tenex, Federal Match(the super premium stuff, UM1 IIRC), Lapua Match and perhaps some of the RWS Match ammo if you can find it. That's if you're shooting BR50 or some other super accurate type of thing, I just normally use Federal 911 Match ammo, it's fairly cheap and works very well in my Win 52D's and my Kimber. Semper Fidelis..Ken M