The manufacturing process that Kevin saw, I believe, was a lapping process used to produce a micro-finish bore. Lead is used for the lap as it can be easily CHARGED with the lapping compound. Using mandrels in various sizes can be tedious but will produce good results. I'm sure any of the restorers mentioned on this sight will have a dent-raiser which is much more efficient. Screw-in-chokes are a possibility if you have sufficient wall thickness Mono-blocking may be a good investment if it brings you an improvement to your shooting life, however, if you expect to recover many of the dollars you invested at a later date I predict you will be disappointed.
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