I found that afer 2500- 3000 rounds of 204 I saw about the same erosion with it as I do with 4000-4500 rounds with my 223's.
Interesting.I have a .204 but only have about 1600 rounds through the barrel and I was wondering how long it will hold up. I expected to see it starting to cough at about 2500 to 3000 rounds and your info kinda confirms that.I suppose it will puke some time after that.