The Leupold Standard 2-Piece Rifle Scope Mount Bases for Remington Model 7 cannot be guaranteed to fit a Remington 740. I recommend contacting Leupold to confirm since there is not a Remington 740 set of Leupold Standard 2-Piece Rifle Scope Mount Bases.
The Leupold Standard 2-Piece Rifle Scope Mount Base models for the Weatherby Mark V should work fine with that rifle.
From what information I could find from Weatherby, if your Weatherby Vanguard is a 9 lug model the Leupold Standard 2-Piece Rifle Scope Mount Base models 51701, 51702, and 51703 will work.
No, the correct model for the Remington 700 muzzleloader is here: LU-MT-BASE-1PC-50006
No, this will not work for that rifle.
We do not have a hole pattern chart as Leupold does not offer one. If you need exact dimensions, you will need to reach out directly to Leupold as they are the manufacturers of these bases.
Those exact dimensions are not provided by Leupold. If you need the exact dimensions you will need to contact Leupold directly.
Leupold lists MPN: 50025 for the FN Mauser's.
Leupold only offers the 1 piece Standard base for the Browning BAR. It can be found under MPN: 49985 here:
https://www.opticsplanet.com/leupold-std-1pc-1-piece-bases.html