Texken: Pardon my slow reply to your question on barrel life in my 204's!
I just now reread this thread and saw your inquiry to me.
My answer is "I don't know" - I spread my 204 shooting out among so many different 204 Rifles of mine I have NOT noticed any loss of accuracy at all to date.
I did see where our fellow CampFirer "Boatammo" shot out one of his 204's in 3,500 rounds and another poster here shot out a 204 barrel in 2,000 rounds!
I will review those posts and make sure my answer is based on what they actually wrote.
If "I" only got 2,000 rounds of accuracy out of any of my 204's before barrel replacement was needed I would be GREATLY surprised and GREATLY disappointed.
My first 204 Rifle has maybe 700 rounds through it and again shoots as well today as originally.
Again pardon my slow reply to your pertinent question.
Hold into the wind
VarmintGuy