Thread: Rechambering question for you experienced machinists

Re-reaming can lengthen freebore with the appropriate reamer but it would have to be done by hand to avoid increasing the headspace. Such jobs require 'feel' which only comes from experience. Setting the barrel back 1 turn and completely re-doing it would be a better option. Normally custom leed length is done with a specialist throating reamer which cannot alter headspace. Chamber design is already well laid down in the SAAMI specifications and based on over 100 years of 'best practice'. Anything other than a round wheel is going to give problems!