Call Pacific Tool & Gauge and talk with Dave Kiff. IMHO, you will need the removable Pilots for your reamer; I buy mine in .0002" increments. You'll need about five of them, the nominal size, and two up and two down in .0002" increments. You'll also need a range rod to indicate the barrel in with. Order your Reamer with the nominal pilot and the range rod with one of the other five pilots. Dave is GTG and is a big help.