To determine the headspace for a specific gun (and the sized cases for that same gun), does my headspace measurement come from measuring the head space of a once fired case in that gun or do i measure the chamber with a tool and then use that measurement to set my die?
What guages/tools do i need to purchase to be able to measure head space? There are so many products and i get them confused as to which one i need and what they do.
My main goal right now is to determine head space and correctly adjust my dies. I use RCBS standard dies-are these good enough to perform good sizing? Please use laymans terms
Forgot to add- im FL sizing
Am looking at the Redding FL bushing die. What size bushing do i need for the 22-250?