I've been measuring revolver barrels for some time now and have found that many are under what is advertised by as much as 3/16". Usually it's 1/8" to 1/16". This is true of pre-war revolvers as well. Sometimes they're at size or even a 1/16" over, but not often. The actual intended barrel length of my RM will only be decided by a S&W factory letter and nothing else I guess. I thank all for trying to help.
Do not forget to come back here when your letter arrives.
