I have cleaned up a number of rifle shotgun chambers and even revolver cylinders by making a wood lap. Turn it cartridge size charge with compound. Which grit depends on now bad it is. Valve grinding compound will clean up the worst quickly. Most times I start with less aggressive compound moving to more course only if needed.
You can turn the lap with a cordless drill, however I prefer my drill press. Put a small tube in the chuck run a plumb bob through the tube to index a wood board on the table with muzzle size plug or if a single barrel shallow hole muzzle size. Replace the tube with the lap put the muzzle on the table plug and clean the chamber nice and true. Back off on the quill to check cartridge fit. It cuts a lot faster than you would expect so check often.
If hardwood they last long enough to do the job, and can be cut down for smaller chambers when worn. If you want can post a photo of one made up.
It can be done on the lathe too, that's how a reamer is run, but the drill press is faster and easier lapping because you can insert and remove quick and true. I an getting ready to do a .25 Krag Chamber on the drill press now that finished rough from a rented reamer, cases stick on extraction.
William
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