I have extensive experience with the Vanguard. stalkingbear is the big Browning guy, though I think he is an A-Bolt aficionado
The Vanguard is a great action. I have one in .25-06 that I built for my grandfather before he passed and he loved it.
The Vanguard is made in Japan, by Howa, and is CNC machined to exact tolerances. it's a flat bottom action with a very good integral recoil lug, very good extractor and the Vanguard's come with an accuracy guarantee from Weatherby, so it's a hard rifle package to beat at the moment.
is a side by side action comparison I did awhile back for the forum - but it did not include the Browning Bolts.
Good luck with your purchase decision and please post a range report...