Never shooting Thunderbolts again!

Lead bullets damaged a steel barrel? I think there may be more to this.
I agree it seems implausible. When I called Ruger and mentioned the barrel looked like it had little golf ball dimples down the rifling, they asked if I was using ThunderTurds. Then they informed me they're seeing a rash of these. Send in the barrel, we'll replace it, and never use Remington unplated bullets again. They stated the problem was with Rem's lube, it left spots of lead/failed lube and the next round ironed them into the rifling, and grabbed a bit more.
 
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