LOL, ekm I would hardly consider Lazzeroni as a "...way out there... gone tomorrow..." company. The man does what he does because he enjoys it, not because he is trying to make a living. He is a multi-millionaire from industy. He isnt dependant upon guns for keeping the doors open. That alone puts him WELL ahead of most custom/wildcatters if you will.

The Warbird and up will MORE than do what you are wanting. 600yds is never easy but I cant think of anything that makes that distance easier than the 'bird. The RUMs are fine guns as well, but you will certainly need to handload them to get the max from them. As will a 30/378 Wby.

All of the above mentioned thundercannons are fun to shoot at well over a 1/4 of a mile. And they can be had in packages that make them suitable for toting out west.

That bein said, I wont quit till I have a AR50 lol,
RA