Ed, I have three questions after reading the thread again:
First, do you know the status of Rob's stamped rims for the converted .50 BMG brass? I'd like to purchase some!
Second, I am interested in what I can load the NEF with when using long brass 3.85" case, with large primers? Like the one in this pic:
This is from Page 6 where you state this is RG's Jacketed 715 gr slug. I have some swaging equipment and can press my own jacketed slugs! What kind of load would you recommend for a 1000 gr slug / 3.85" full brass / large primer?
Lastly, when you say "large" primers, are you talking about SHOTGUN primers, Large RIFLE primers, or BMG primers?