Well, this dosen't look safe!

[benmychree]

Quite agreed, Bob; It would be entirely better to regrind a machine reamer to the desired size than a drill; they are ground with a slight back taper and NO relief on the flutes, all cutting being done on the chamfer at the end. a relief may be added on the flutes, leaving a circular land on each flute; this is just done to reduce drag (friction) I have done this to probably a hundred or so reamers over the years, including a whole set of shell reamers that looked like they had been tumbled in a cement mixer; I ground each one size under, ground the part where the size was stamped and re etched the new diameter on each; they were then reground on the chamfer at the end, which does all the cutting and relieved on the diameter to reduce friction, leaving a narrow circular land.
All this could be done on a lathe with a tool post grinder, taking care to cover all the way surfaces if one does not have a tool & cutter grinder.