I've heard the old tale that jacketed bullets will wear out a barrel for years. However, after having worn out several guns over the years, it has been my experience that, in a quality gun with deep grooves, the gun itself will wear out long before the riflings will.
In a lower qualtiy gun with poor (shallow) riflings initialy from the factory this may be true. But then those guns are seldom tack drivers to begin with.
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Gunslinger
I was promised a Shortycicle and I want a Shortycicle!