Thanks to all for the excellent advice. Since I'm a newbie, all comments are helpful including the ones that make me reflect on whether the drilling is right for what I am looking for.

By chance, guess what was also on the Bob Jones website recommended above? An unfired Krieghoff Trumph Drilling 12 x 12 over 30-06 with 25 inch barrels! (I wonder if this is a sign from the Drilling angels or demons? ha! ha!) The price is quite a far ways from inexpensive, though (US$5,450)

I also checked out JMar's site and sent him an email. On his site there is mention of Briley choke tubes and inserts for Drillings.

Just two questions:

a) So far it looks like Krieghoff and Colt/Sauer produce 12x12 over 30-06 Drillings. Does anyone else?

b) How easy is it to get inserts made for for a used Drilling? Do inserts have to be made by the original factory? If so, are the factories willing to make one for a used gun?

Any and all advice would be gratefully appreciated!

Many thanks again!

gods are