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Top competitive shooters rebarreled their .308 Win. bolt action rifles after about 3000 rounds. They started out with a barrel that would shoot sub 1/4th MOA at 100 yards and under 1/3 MOA at 100 and 1/2 MOA at 600 (1/3 MOA at 100 and 2/3 MOA at 600 for semiauto M1 & M14 service rifles). Their belted magnums lasted only 800 to 1100 rounds.
When these competitive folks started using the .243 Win. in competition, their barrels lasted only 1500 rounds.
A factory rifle will seem to have twice this accuracy life because they're not that accurate to start with. And service rifles used for combat use will have three times those numbers for barrel life.
And rapid fire doesn't cause as much bore erosion as maximum loads do.
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