Part of it is probably that they are used for long rang compititions, and as soon as you start to lose your edge you dump the barrel. I've talked to people changing them in 900-1300 rounds. Plus if your using it for something like F-Open, a 22 shot string in 100 degree weather hard on a barrel.
Back in the spring I got a 308 for F-TR, and that barrel gets HOT after 3x22 shot matches. I've put 1k rounds down the tube already, so if I went with a 6.5x284 I'd probably be shopping for barrels now.
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