Originally Posted by 338reddog
Originally Posted by 2ndwind
I have a 550 and don't see how a double charge could result?
Load handgun case that 2 charges will fit. Pull the handle twice with out advancing. It can happen, When I had 550’s I purposely tried it. No I didn’t shoot it. But I figured if someone walked away from the loader and pulled that handle with out checking it would/could happen

I would be OK with a 550 if it had space for a RCBS lockout die or powder check. You could possibly do this if you seat/crimp with one die.