Thing is, fellas, Weatherby is the only one to offer that guarantee (out of the box - Big Manufacturers). Remington, Winchester, Ruger, Marlin, none of those make that claim. I'd even go so far as to say that if you shoot 1.75" groups and its the best you can do, the others won't do a thing about it. Weatherby will. 1.5 MOA, naw, it ain't great, but it is guaranteed. Like the previous poster mentioned, nearly all Weatherby's will shoot much better. Remington, Winchester, Ruger all claim their rifles will shoot, but Weatherby guarantees it.
Heck, I ain't even a Weatherby fan.