I know that some of you on this board is very knowledgable of a match chambering. If I were to have my 6.5-06 rehambered to a 6.5 Gibbs or something else with the same case head deminsions, how much would the barrel have to be set back to have a match grade chamber? Any recommendations on a case that would max out velocities with my capabilities shooting a 140gr. bullet. Or would it be worth the trouble? Thanks.