I think Manson or Clymer will make a reamer that not only cuts rim recesses, but forcing cones and also has a replaceable pilot. A friend has one that has been used to cut out the undersized rim recesses on 28 gauge Parkers, at the same time cutting the chambers a little longer than the factory cut 2 3/8". This can't be an inexpensive tool, but it has been used several times, will last forever if cared for, and is easily worked by hand. I used it on two 28 gauges, taking less than fifteen minutes to do both, outdoors on a picnic table. I have cut rim recesses on a Parker 28 gauge with a right angle attachment on a Bridgeport, but would never have attempted that if I knew such a hand reamer were available. At the time I used the Bridgeport for this job, almost fifty years ago, I would guess that such a reamer probably was not available.
