« Reply #4 on: February 07, 2014, 04:13:10 AM »
I had the same problem as Jason F with pierced primers on a 20ga TDC barrel that was factory fit to an SB2. I put the barrel on an SB1 and the problem went away. I was shooting factory shotshells, not +P slugs. Factory 20ga slugs are supposed to be loaded to the same pressure specifications as shotshells so to me there is no issues with a 20ga USH barrel on a SB1 frame.
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