Very interesting, I had never heard of this cartridge. Looks like they went the way of the 400 Cor-Bon and the 357 Sig. I read about it in a Guns and Ammo article. Said it was probably the most powerful 44 mag out there. Good thing is it can be reloaded with 44 mag bullets which should be more readily found.

I should imagine that there is a ready supply of 50AE out there somewhere. Couple of boxes of loaded on G Broker.