I do not have a Vanguard, so I can not speak about them. I bought the Accumark in .338/378 Weatherby. This is my first and only Weatherby. I reload my own ammo due to the high cost of Weatherby ammo. I am quite happy with my gun.
I have met two different individuals at the local shooting range that hate Weatherby rifles. They swear that Weatherby is the worst shooting guns made. They have had gunsmiths do everything possiable to their guns and they only got worse. Then they see my targets and they shut up.
I have taken the time to talk to both of these guys and asked questions about their guns. The first thing both guys did was take their new guns to a gunsmith and ask him to mount the scope, and do what ever was needed to make it a good shooter. Local gunsmiths cleaned out the stocks, then glass bedded both guns. I asked them why they did that? Their response was "No gun shoots good right out of the box"! Then they ask me who I had work on my gun, as they admire my targets. I then tell them no body has touched my gun since Weatherby put it togeather. The action and the stock have never been separated. For some reason they find that hard to believe. In parting I ask both the same question. "Why did you have a gunsmith screw up a good gun"?
That's OK, I'll continue to make my 500 to 800 yard shots, on Grizzly and Moose. I have confidence that my right out of the box gun will hit where I aim it.