Triming Cases

[Kurt]

Sam.
The first thing I do is make some sort of chamber cast using low temp alloy or sulphur to get the length of the chamber. Most generally the new brass is to short anyway.
I first anneal my new brass when I get it then I shoot it with a GG bullet with a snug roll crimp if I'm to lazy to make a chamber cast. I do this with one case only just to stretch it slightly to have the case get pulled to the chamber end where I can see where the chamber end roles up into the lead slightly. Then I trim that case and use it to set my Wilson trimmer so it trims the case .005" shorter. I like to give the case some room so it don't pull the neck up into the lead so it has some spring back.
I will not trim my cases till they stretch enough to fill the chamber. You will see by looking at the case mouth when they need trimming.