Igorrock

I saw the same rifle and was wondering about it myself. I think this is built on a Remington Model 30 action with the bolt altered to remove the 'dogleg'.

I can't find much on the cartridge except that ballistics are apparently about midway between the 458 Win and 460 Weatherby, about the same as the 458 Lott.

Looks like a well made, well balanced rifle, not unattractive at all.