Chuck:
Picked up about 600 .475 325 grain blems from Midway, for the .475. Cast bullet prices. Don't know who made them, and what the limit is. We'll cut one apart and have a look, one of these days.
I've got a bunch of 525's in .510" cast. That was the other consideration, plus this pistol:
Cartridges are .500Linebaugh short, which it shoots, 50 Alaskan, 50-110, .510 Van Horn, with 600 grain bullets at 2150 fps, Barnes solids, and a bunch of .458 Lott, 500 grains, 2300 or so.
I've found that with a PAST recoil pad, the .510 570 grain bullets at 2025 fps are easy, out of Seans' double rifle.
Without the pad, both the Lott, and to a much higher degree, the Van Horn, get into my shoulder too much.
I think the .470 A&M/Chopstick are about the most sensible for a balance of recoil vs. penetration, and stopping power.
Here's the .475 with ammo:
You can see the flat point, for size comparison. Also, Hawk makes bullets with different thickness jackets. Haven't checked Woodleighs or others for softpoint, heavy game bullets...