es
My wife and I both have Sauer 3000 drillings in 12x12x30-06.
These guns were made in the 1960's.
They are the same model as the Colt-Sauer Drillings, the Colts having a little different Americanized look.

Both of our guns are fitted with scopes in claw mounts.
They are plenty accurate.
With the scopes removed I like them better for wing shooting than my Browning 12 ga O/U.

You should be able to find one for around $3500 to $4500 US.

The most commom rifle bbl calibers are 30/06 and 243.