I sure enjoy seeing that Tikka 512 set. At one time I was consumed by the Valmet 412 system and had both 412 and 412S receivers/wood and every flavor of barrel sets they made. I believe you know about how well the 223 shoots under that 12ga barrel.

I got a Tikka 512 from Cape Outfitters just before Don died. Jeff Mayfield hand picked one for me in 12/9,3X74R, and I had several scope mounts already. I soon after acquired a Tikka set made by Lothar Walther in 9,3/9,3 double rifle and took the set to Masailand on a buffalo hunt. (Thank God for credit cards!)

This was the set: