I'm thinking about a Vanguard Talus in the Wby 6.5. Is it performing as Weatherby claims?
Yes, it performs like Weatherby claims.
I had one for a while, an Ultra Lightweight Mark V, with a 26" barrel. It got just about exactly the same velocities as my 26 Nosler, a Nosler rifle with a 26" barrel. This wasn't surprising, since the powder capacity of the two cases is just about exactly the same.