I probably spend more time switching barrels than I do shooting! ;D

Every barrel gets mounted onto the "test" action and fired to get an idea of how it shoots with a proven action/scope/stock combo. Then it will be moved to a different action depending on caliber and intended use. There's the target action, varmint action, hunting actions, and plinking actions. Once I get a setup that I like, I lock the barrel nut down with a set screw so that I don't need to worry about headspacing the barrel any more. I just use a port entry action wrench and a strap wrench to swap the barrels back and forth after that.

Andrew