Quote:
Originally Posted by 260 Rem
All barrels are chambered with reamers that result in the “marks” that pick up copper from the jacket until they get “ironed” out. Given that most “factory” barrels are not lapped, it would be reasonable to assume they would pick up even more copper than a lapped aftermarket barrel. I would do a BI on a virgin factory barrel.
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x2 If you leave the copper build up in the throat as it gets ironed out it can be bitch to remove sometimes,sometimes not so bad. I do a BI on a virgin barrel for all the time it takes if you own the gun for a lifetime.