Flaring pistol brass

[Buffco]

Noticed the .357 mag cases are flaring a bit .... odd. Seems one side of the case mouth has a barely perceptible flare to it, but the other side? Nada.

That ok? Unusual?

Lee pour through powder and flaring die, before you ask.

[Teach]

It sounds like you're expanding the cases too much. Adjust the die up until it barely bell-mouths the case enough for the bullet to start seating without shaving lead off. Jacketed bullets don't really need the case expanded at all, but I usually do just enough expansion that the bullet starts straight, then I adjust the seater die deep enough to iron the case mouth back down flat against the bullet. If it's a very heavy load and the bullet has a cannelure, adjust the seater die down deep enough to crimp the case into the cannelure. Be careful the case doesn't buckle from too much crimp!
Jerry

[cpj]

It sounds like you're expanding the cases too much. Adjust the die up until it barely bell-mouths the case enough for the bullet to start seating without shaving lead off. Jacketed bullets don't really need the case expanded at all, but I usually do just enough expansion that the bullet starts straight, then I adjust the seater die deep enough to iron the case mouth back down flat against the bullet. If it's a very heavy load and the bullet has a cannelure, adjust the seater die down deep enough to crimp the case into the cannelure. Be careful the case doesn't buckle from too much crimp!
Jerry

what Mr Jerry said. HOw much bell is enough?
Just enough. For jacketed bullets, if you can feel its flared, your are good. For lead, just a little more
It dont take much.