What size pilot bushing does the reamer have? Floating or fixed?

Reaming a 'charge hole' is easier than a cyl chamber because it's already a consistent diameter all the way thru the cylinder. The 22 LR is about the only remaining cartridge with a heeled bullet and therefore uses a charge hole which makes an excellent pilot hole for a proper sized reamer bushing.

You can Google reaming and get more information than you ever wanted. But basically you want precise positioning and clamping of the cyl, slow speed in a vertical mill or stout drill press, and lubrication, lubrication, lubrication. Align your pilot on the reamer in the charge hole to position the cyl then clamp squarely in your worktable vise. Follow the original S&W chamber alignment. The less times you make a pass thru the chamber, the less chance you have of messing up the alignment.

To go from .22 to .32 doesn't require a great deal of material removal. So you can ream in one step with a finishing reamer. Therefore a relatively easy one pass ream job.

Have fun,

__________________
Jim
S&WCA #819