I'm bulk loading 223's right now for match target next spring (tumbling loaded cases too.....). My question don't relate to that but rather, does anyone use the Lee Factory Crimp dies? Midway had/has them on sale for $9.99 each so I bought 2, one in 223 and one in 308. I load my 223's with Gold Medal Match Dies and bullet seater so there is no crimp option. I'm always concerned about bullet movement in the magazine of my semi auto (no, it's not an AR...), so is crimping worth it and does it increase pressures? The 308's are loaded with bushing dies (Redding) so no crimp there either. I've never crimped anything but pistol (roll crimp) cartridges but factory ammo usually comes crimped, especially 223. Opinions appreciated.