Case head separation

[Steve Donlon]

1. Never use rhe same brass in 2 different rifles.

Very true.


2. The first firing may stretch the brass .010" or more. The 2nd rifle may strerch brass again.

A crush fit, when closing the bolt, is rhe only way to know that the brass has fully expanded to the chamber.

A starting load may make the head to datum measurement shorter. More stretching as the powder charge is increased.

I missed that part about shooting the brass in 2 different rifles! That most likely could be a big problem if the chambers were not the same.

 

[Tim Singleton]

The chamber is the ultimate 'case gauge'. You should be setting the shoulder bump by using brass fired in your chamber.

This very well is the problem!
If he is setting his shoulder from rhat gauge instead of the fired brass