Author: britrifles
Subject: H4350 Match Loads
Posted: February 10 2020 at 8:20am
I did some measurements of the brass cases as fired from the rifle and after sizing in my RCBS FL die. I have the die backed out almost 0.1 inches from the she!! holder such that the shoulder is pushed back by only 0.003 inches and the sized case freely chambers in the rifle.
Subject: H4350 Match Loads
Posted: February 10 2020 at 8:20am
I did some measurements of the brass cases as fired from the rifle and after sizing in my RCBS FL die. I have the die backed out almost 0.1 inches from the she!! holder such that the shoulder is pushed back by only 0.003 inches and the sized case freely chambers in the rifle.
The body of the case is not sized at all from the head to about 0.5 inches above the rim (max diameter reads the same after sizing, 0.454). The body of the case is reduced in diameter by 0.012 inches at the bottom of the shoulder after sizing to 0.394 inches.
So, I really can't explain why I had so many case heads crack after FL sizing. It might be that the case with a reduced body diameter will first shorten as it expands to fill the chamber and then when the it grips the chamber it subsequently stretches in the web area. Just a theory...