Yes the tikka m77 predates the 512 but is basically the same as the valmet 412. My great uncle had a ithaca made by tikka that was a model 77 tikka with the ithaca name on it. It was in 12/222, yes wish they had srew in chokes but my valmet chokes are really tight the 12/12 has a modified and full that are more closely to a full and extra full and the 12/223 is a improved modified. All the grouse I have killed has been with my remington 870. As I don't have a dog I just walk and jump them up. Haven't killed a lot of them haven't seen a lot in the last couple of years. The one person that I know that do a lot of grouse and other upland hunting uses a valmet 412 in 12/12 and also he uses other Beretta over and unders mainly in 12 ga.