I'd estimate I have about 5,000 rounds through my .204, which is a Ruger compact stainless with a 20 inch barrel. The accuracy is great and is used primarily for prairie rats. I have not noticed any degradation of accuracy, which surprises me because the barrel gets HOT. I started with 200 rounds of new ammo for cases, and they started to split pretty quickly. I bought 400 once-fired and have been going through those pretty quickly. The only cases I have tried are Hornady, and I can't wait to try some Win or Rem cases. I hope they last longer...