One of his auctions has a list of chamberings offered, and the bottom says COMING SOON, 300 Winchester Magnum Target. Maybe that's the same thing as the tactical match?
A match chamber is typically on the smaller size of SAAMI specs, and/or has a tight neck, possibly requiring neck turning. You'll have to get up with Jim to see what the specs on his reamer are to determine these things though (assuming that is a version of 300WM chambering). Shoot him a PM on here, he usually replies in a timely manner.
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