I designed my own cartridge. 50CB based on a shortened 56-50 case. I cut the chamber with a boring bar with DRO instead of a reamer.

One thing I learned, those gentle lead angles are there for a reason.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps