My match barrels (now using Olympic Arms barrels, sorry...) will go up to 5,000 or so and still be my match berrael, before replacement. This is for 1/4 to 1/2 moa work.
For plinking, they are good for up to 40,000 if a 2" group is acceptable at 100. This is in a non-chrome lined barrel too. If the chrome starts coming out of the barrel sooner, which I have experienced, it becomes a tent stake in a hurry.