A friend of mine bought a rifle in Michigan built on a large 602 BRNO action. Heavy stainless 28 inch barrel. We know the bore is .458. He made a chamber cast and the chamber is huge possibly 505 Gibbs? The barrel is marked 458 Velociraptor. Has anyone heard of this wildcat ? It was purchased at a pawn shop and they had no history on it.

A picture of the chamber cast with some measurements could help an educated guess. The name was or is, just what the fellow who made it wanted it called I would guess. Don't know for certain.