Seriously? Really? No it doesn't. That is why Roy had to add freebore.
All of them originally (at least the ones developed in the 40's). They didn't have powders available to facilitate the speeds he was claiming. You know, there are books out there on the subject of cartridges, and specifically Weatherby and his line. They have facts in them, and are actually interesting reads.
And how many Weatherby's do you see in the hands of the Professional Hunters that live there day in and out and rely on their rifles to survive? Nearly none as they have an pervasive reputation as unreliable, and in fact if the don't have a double it is very likely they are carrying a Mauser, BRNO or Winchester Model 70 actioned rifle, and rarely ever in a Weatherby cartridge. Roy also had some very epic failures in Africa, and at this point the majority of Roy's theories created on those trips have been debunked. No Africa for me, but last I checked, the plumbing on the animals here is the same.
Fail indeed.