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When it comes to barrel life heat is your enemy,you loose accuracy when the throat starts to erode and heat accelerated that erosion. Shooting any high velocity small caliber varmint style cartridge in rapid succession over many rds. without letting the barrel cool does more damage that the type bullet you use.
As far as J bullets being better for your bore than lead bullet,you will find it hard to ever wear out a good barrel shooting cast lead bullet through it,if you find that you getting leading in your rifles bore than you either have a rough bore or you have a bullet/lube problem. My cleaning procedure after shooting cast lead in my rifles come down to pushing a wet patch down the bore followed by a couple dry patches,wiping the lube ring of the muzzle and running a patch lightly coated with Ed's Red down the bore and I go home.
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