CptCurl,
Those paperpatched bullets look great, hope they shoot as well as they look.
I'm using cast bullets in my 500. Bullets are a 340 ground nose from an NEI mould and a 370 gr hollow point from a modified Lyman 515141. My current best load is the 370 HP, 54 gr IMR 4198 and 14 gr of dacron with a large rifle primer. Puts six into a ragged hole at 50 yds. My 577/500 uses the same except 52gr of 4198 and a mag primer. The 577 case seems to need the mag primer in both this rifle and my 577 3", I think due to the larger interior area of the bigger case. The 500 case does fine with standard primers. I also have moulds for 400 and 450 gr bullets, may try the 400 at some later time.
If either you or Pistolchamp want to try either of these bullets let me know what size you need. I'm using .510 in the 500 and .512 in the 577/500.
Let me know how the LBTs and Cast Performance bullets work, I've been wanting to try the same. The 350 WFNGC should shoot in your rifle with a slight adjustment in the powder charge but as we all know each rifle is a case unto itself. Hope they work for you, I understand they are about the best hunting bullet you can get for these velocities.
Pistolchamp, keep us posted on how you're doing. Be sure to get a copy of that Ross Seyfried article, it was in the Oct/Nov 2002 "Handloader", best on the subject.
Best to both of you guys.