I don't think it's the long throat that is the issue- but the relationship between the throat and bullet. If the bullet has a long way to travel before it seals up the barrel then it is going to let more hot gas around it and that will cause more erosion. I have some barrels with very long throats- but they shoot heavy for caliber bullets- and they don't seem to wear fast.
Also- boat tail bullets cause more erosion than flat base because of how they funnel the gas to the sides.... as well as bullet construction and how easily they bump up and seal the bore..... so it has a lot more variables than just round count.
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