I would assume it's possible. wouldn't obviously be as precise as a dialed in barrel on a lathe. but if you were patient and cut it slowly as in very little force exerted on the reamer you could end up with a nice chamber. but don't be surprised if it takes you a few hours of reaming/ pulling out wiping chips, re-oiling ect.. turn the reamer as close to the shank as possible. the further you turn on the t-handle the more likely you'll be cutting a out of round chamber due to how the force is exerted.
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