I just stumbled across this video. He's testing penetration of BFR's in 458 African (WM?), 475 Nitro and 50 Alaskan shooting solids. Then he fires a 600 Overkill with a 900 gr solid at 2000fps for comparison. I think I'll stick with my 44 mag and 454 Casull BFR's.
Oh boy, that's Avi. He was the one who first commissioned the build of my .50 Alaskan D-Max. I believe that notion lasted only one shooting session before it ended up back in Jack Huntington's shop.