According to the gunsmith at Gander Mountain the Leupold bases for the Remington 700 will fit my Weatherby Vanguard. He said this because these mounts are also for the S&W 1500 which is the same action as the Howa 1500.
Yes the screws line up but the windage adjustment screw area of the base hang over the receiver and will not allow the bolt to open completely. I can reverse it but it will then hang over the other side of the receiver.
The Leupold part number is 50016.
Thanks for the help.
TX7Mag