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It's the gas blow-by generally associated with non-lead bullets.If bimetal jackets did damage the bore like people think it would, then yes people would stop using it. But its not the bimetal jacket that does the damage, its the powder. And even then, it takes a lot (and I mean A LOT) of shooting before it makes a difference.
You're going to get match-grade accuracy from a 1911 (out of a match barrel) for about 10,000 rounds.. with lead it's more like 50-100,000+.