I just got back from Academy with a box of Remington Core-Lokt. I've measured 5 of those and they are 0.465- 0.466 at the .200 line. Now I'm confused, my Hornady 10th edition book shows 0.470? First box of factory ammo in about 10 years lol!
Factory ammo will be small at the base, and shoulder because they use new brass.
Sizing back as much as your dies are doing is just over working the brass, there is a few cartridges were it does have to be sized back by .004 like the PRC, 20VT and my 30-28 to avoid clickers with Lapua and ADG brass because that brass is really thick at the web
Factory ammo has to also fit every gun out there.
