This may be a silly question, but I've been running "a few" pistol cases through the case prep pipeline lately. It's given me lots of time to ponder the universe. Is there a reason bullet manufacturers make their pistol bullets so square at the bottom? If they built in a slight bevel, wouldn't that do away with the need to expand the case mouth to get the bullet to begin the seating process? I'll continue to go through the seemingly pointless process of belling cases, but part of my brain just screams why, why why?