Delving kinda' deep on laundry day huh ? I've recently been acquiring reloading equipment and supplies to get started reloading and have had some of the same type of questions. Brass should be brass--caliber to caliber ---right ? You would think with all the specs. out for each individual caliber that the brass should be identical regardless of Mfg.. Yet--some is thinner--some is longer------why?
Wish I was more help-------Starline from Starline is where I would go first to compare-------YMMV.