That's definitely an issue. Just starting at putting the bases on there's a few ways of screwing up, starting with the screws being different lengths. A bottomed out screw holds nothing. Remington 700 bases screw to the rifle but that's not the same as fitting. The rear action ring is lower on a Vanguard requiring either shimming or the proper thickness of base in the first place. Misalignments with the wrong bases are on the order of 20-40 thousandths, which is a lot of scope bending badness. Talley and Leupold get it right, Weaver has a shim warning that nobody reads and unless things have changed in the last few years few other mount makers have a clue. There's precious few Vanguard specific rails, so I'd wager there's a 700 rail that is "supposed to fit" in play. That gives the likelihood of bending the base to fit the action by tightening the screws so you can in turn bend the scope to match the crooked rail. A no-nonsense steel rail will bend the action to fit the base. Proper mounting of a rail involves properly bedding the rail to the action. That's more than you can expect of any counter guy, and would be Greek to a lot of gun-smiths as well. Sure a lot of hassle for a part that a hunter is better off without in the first place.
All this and we haven't even looked at the gun, rings or scope yet.![]()
If anyone wants to see a rough idea of how much cant there is with unshimmed Weaver bases, I installed these ones on a brand new rifle yesterday.
Hasn't stressed me out any, but Talley does have a different SKU for their Vanguard and R700 bases, which implies they are actually different. Considering that scope is never really planned to come off of that rifle, may upgrade to Talley.

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