As for barrel life most guys are swapping barrels at 1500rds in any of these variants for serious competition as they are seeing the lands wear done a few thousanths every 100rds through the barrel.
Most barrels have lands of approximately. 004 to .005 tall, I doubt it is the lands being wore down but the throat being eroded. This is why you can set back a barrel 1.5" and rechamber it.
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