Yep, .50 bullets are easy now that Richard is making them. I cast them from 300 to 650 grains and Richard makes jacketed up to 910 grains so far. Brass for the .50Alaskan is easy too, blow out .348s like Robin says and Starline offers .50 Alaskan brass ready made now. I wouldn't touch the Marlin conversion, but the 71 would be great, I had one 450 Alaskan as well as the .50 Alaskan M78 that Robin has now. That is a nice rifle and I deeply regret parting with it. I hear it stops deer too huh Robin?