Quoted:
Before I pull it apart i would like to prep the new barrel.
View Quote
Don't!!!!!!
Spin the old barrel off, check and blue print the receiver first, then you can slightly over-size the new barrel threads to mate up with the threads you just cleaned up in the receiver to true them with the action.
Hence TC, like Rem, mass produces the receivers, so not only may the receiver threads in the receiver not be true with the bore line of the receiver, but the front end of the receiver not true with the bore line of the receiver as well.
Hence the Thompson Center Dimension is the receiver that has a barrel socket type receiver for quick change barrel, but the compass is just as standard type thread in barrel type receiver, and it pays huge dividends to true the action before you install a new barrel instead.