If you are talking a switch barrel setup, given the 70 barrels have an extractor cut... your. Barrels will need witness marks so you know they are turned back to exactly the same spot. (Talking about ONE line on the action that will line up with marks on each barrel so you know you are there.
In general you will probably require a good action vise & wrench setup, and should get go/ no-go gauges to double check the work.
WHATEVER you do - make sure the Smith laps the bolt lugs BEFORE the first. Barrel change... and doesn’t screw with the lug surfaces to help headspacing for the other barrels.....
Last edited by Spotshooter; 01/29/20.
