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Standard spec is .199". This allows using a 140 hybrid at 0.025" off the lands and just fits in (less than 0.010" clearance) in an AICS mag. If I was set on running jammed, I would have the freebore at .175-.180" as Grimstod suggested.
Edit- the above statement assumes you are mag loading. If dedicated as a single shot set-up, the standard reamer spec (.199") will still give plenty of bearing surface in the neck.[/QUOT