I have used a 412s 12/30-06 for 30 years. It was a perfect gun for a working deer hunting guide and I got so used to it that I have carried it ever since. All the years I had it,however, it never really shot well. It could hold an 8 inch circle at 100 yards but not much better then that. On a couple of occasions I had "gunsmiths" look at it but I never trusted their analysis. One said it was a problem with the small barrell overheating and throwing shells, another said that the 12 gage magnum made the scope slip in the mounts (I have a look through mount so it sits pretty high). I did not put much stock in either of their opinions but had no answer myself. Recently I took it to a new gunsmith who was more highly recommended and he says that the twist in the barrell will not stabilize a heavy bullet like a 180 or greater. He says he had very good results with a 150 grain bullet.
What do you think, does this make sense to you guys?