Thread: Shoulder bump question

Yeah keep neck sizing until they no longer chamber, then full or partial size, it'll work you brass less and help them last longer. I've neck sized the same brass half a dozen times and they still chamber mint.

Originally Posted by Three O'Three

Yeah keep neck sizing until they no longer chamber, then full or partial size, it'll work you brass less and help them last longer. I've neck sized the same brass half a dozen times and they still chamber mint.

Yes and no. It really depends on what type of die you are using to neck size. And also if you are annealing every firing (and exactly how well/consistently you are doing this).

The part I am mostly concerned about is the neck. In my world, neck tension is the be all and end all of accuracy. If you are sizing your neck by under-sizing it and then drawing it back through a button (basic, traditional style neck dies), you are actually working the neck brass quite a bit...

Using bushing dies or collet dies minimizes the amount of squeezing and stretching that happens.

My approach is to anneal each firing (using an AMP annealer), then bump the shoulder 0.002 back from a measured fired case, then size the neck using a collet die.