Think I have solved my barrel reaming problem, got a 12mm hand reamer, ground it down to 11.32mm/.446" Dia and the stub end to fit in a holder with oil grove. Have ground back relief on the six flutes . Normally takes me three days to ream and hone a barrel from .443" to .450", now one day and its done, comes out at .449.4" , just a bit of a polish and ready for rifling.
, New reamer on long oil tube rod.
, My tool post grinder attachment.
, Drill in for drive, works a treat.
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