How can you tell wether or not your bolt gun is running straight from one end of the pipe to the other. True'n or bkueprinting an action is something I've never heard of until recently. When I was taught to build guns it never was discussed but custom high end barrels were bought and fitted i.e. tailored the new receiver. That being said....

How can you tell if an action is true or not I'm on a store bought factory rifle?