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I remember reading in Hornady's Reloading manual (7th edition) that their .223 WSSM barrel showed significant throat erosion after about 300 rounds. Other manuals have talked about short fat cartridges wearing out barrels a bit quicker than their standard counterparts.
Anyway, that's just what I have read from the bullet manufacturers. However, I have no personal experience to speak of with short, fat cartridges like (for example) the WSSM line.
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