JPK
You lucky dog. I was at Champlins last Saturday. JJ had just left the range after testing a few rifles, yours being one. I saw the targets and handled your rifle. It is very nice, very nice. It shoots good.In fact I tried to get JJ to call you and tell you it was stolen/blew up/got struck by lightening, etc.
When you get it just test it with the different 458 factory loads till you find the ones that shoot the best. Be sure and test it with Federals 350 gr round nose, that makes a great deer, black bear, wild pig etc load.
Keep us posted on how she shoots.

Once again it is a Nice Rifle.
I also handled a 700 Nitro, 2 600 Nitros and a 577 Nitro.
The best feeling of the ultra large bores was the Marcel Thys 600 Nitro. It is Mark Sullivans double. I have handled it before, it is a nice rifle too.