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Message: <blockquote data-quote="Blitzfike" data-source="post: 2988534" data-attributes="member: 807"><p>Interesting discussion.. take a look with quickload or something like that at reducing case volume for a specific load and see what it tells you of predicted pressure/velocity.  Some powders are way more sensitive than others to reduced case volume.  For several years AA#5 was my goto powder for 9mm and 40 cal ammo. I experienced large jumps in velocity and apparent pressure signs with bullet setback from repeatedly rechambering a round and sticking it back in the top of the mag.  It doesn't take much change with AA#5 to show that result.  When the non lead copper bullets started coming in vogue, there were several articles about home machined copper bullets destroying guns.  Machining driving bands, annealing the copper after forming and a variety of design changes have led us to reliable copper bullets today.  Lots of good info in this discussion.  As to neck sizing, I do that with collet dies on two calibers I shoot and that is to extend the life of the brass.  The first is 22 Hornet and the other is 303 Brit.  In both cases the chamber is considerably looser than the saami specs.  The 303 Brit I can understand as they were mass produced in several different arsenals around the world, but both of my 22 Hornets are Savages and one is quite elderly.</p></blockquote><p></p>