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I never had a problem with the accuracy with the three 264's I had just the velocity, after 500rds it would drop 100fps, I'd up the load, it would drop again by the time a good zero was gotten and so on. You could see the throat erosion without a borescope.
They were all chrome moly barrels though, last one I had was a Remington Classic the year it came out 1986. I used a heavy load of IMR 7828 with 120 nosler bt's to get 3450fps, that was a real barrel burner but an incredible long range load. Maximum point blank range was 420yds with that load/bullet.
Not that remarkable today with cartridges like the 6.5x300 weatherby and 26 nosler using really high bc bullets but in it's day....
With the barrel steels available today they should last longer, it would be interesting to see a definitive test.
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