Joshua

what's a "fixer upper"?
Here's my opinion:
The Sauer drilling appears to be in good condition and ready to be taken hunting:
7x57 R cartridges are available, ballistics are still modern, I'd say perfect for your whitetail deer.
Shotshells will be 70 mm / 2 3/4 inch.
Everything up to modern standards.
Good scope.
I can't comment on US prices, but this appears to be quite right, of course provided there are no faults in the gun, scope, claw mounts - better to have it checked by somebody who is knowledgeable.

The other drilling comes from the blackpowder to nitro transition period.
Maybe nitro proofed, maybe not.
Lots of questions...
At best a "labor of love" to have it in usable condition, at worst a wallhanger.
In terms of usefulness and in comparison to the Sauer drilling, never worth the price that is asked for.

Regards,
fuhrmann