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My point is that I do not believe a bolt action rifle can be fired fast enough for a long enough time to damage the barrel do to overheating.
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I know of at least two instances when a new barrel was fit to a 30 caliber magnum 1000-yard match rifle and the owners thought they ought to be "broken in" with several shots. Both had several dozen shots fired 5 to 6 seconds apart.
Sighting them in at the range with scopes installed, neither shot under 2 MOA at 300 yards. Normal for such barrels and ammo was about 1/3 MOA. Bore erosion gauge inserted in their throats showed the same amount of wear as a .30-06 after about 6000 rounds. They were now not fit for competition.