Re: Explaining Headspace
when you 'full length' resize a shell, you stretch the shell FORWARD, cause thats the only way it can go; the brass thins as is it stretched and gets longer, causing it to get thin; then you get split cases, due to pressure more than the thin case can take; and you also end up trimming them for being too long;
The above mostly applies to autoloaders;
If you shoot a bolt action, or lever action rifle, dont full length re-size your cases;
just collet size them for the neck size of the round you are shooting; you have a perfectly sized shell for your rifle; and your cases will last ten times longer;
From LEE 2ND EDITION RELOADING MANUAL
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