The Ruger SBH that I just recently purchased received it's first pre season cleaning and inspection today. From the S/N it was built in the early to mid 80's. While I have only fired a few trial rounds thru it prior to purchase, and with my handloads it does shoot straight. I want to ring the most out of it at 200 meters! After giving the cylinder a thourough cleaning I used pin guages and checked the throats ( that look like they were punched with a drill press) 3 throats ( side by each ) measure .431" and the other 3 measure .432" What would be the sugestion to help this situation along the path to true accuracy? Have the throats all reamed .433" or just open the .431" to the .432" and polish them all up! I do not think that polishing the .432" will remove the tool marks , but may make the Boolits exit a little smoother. Any sugestions or thoughts are appreciated