I have (4) 6BRs and my brass will fit every gun . I headspace semi tight on a piece of brand new brass . I take fired brass and bump shoulder .002 , and it will fit every gun . I only use Shilen and Criterion pre fits from Northland Shooters Supply . Works for me !Nevertheless...I have to stick with Mike on this one. Undoubtedly, shooters/competitors may get sterling performance out of "pre-fit barrels"...at least a lot of you make that claim, and I will not dispute it.
But, for me, I don't want to worry about my brass not fitting chamber-to-chamber on follow-on barrels? I will yield to all of you "pre-fitters" that have not experienced that dour problem with your brass, chamber-to-chamber on pre-fit barrels.Yet, your success in that area will not have convinced to try pre-fit barrels.
I would be keenly interested in knowing "who" (or just the number of competitors will do) within the top 50 F-Open shooters in the US that use pre-fit barrels. (Calling up Kelbly's and telling them that it's time for a new barrel will not count as a pre-fit barrel, when they are holding your unique reamer.)
Dan