IF you can find one, T/C made a 45 LC/.410 barrel with a screw on external choke to bring the .410 back in to a decent pattern after the rifling had its effect. The choke had to be unscrewed before using the .45 LC ...
When I was in Pararescue, one of the base's area of responsibility was Northern Canada/Greenland and Iceland. I used to store it in my pack so that if I ever had to jump into the North, I would have a gun that was fairly effective against small game and marginally effective against bigger game ... and would quietly fit in a pack ... and I wish I still had that gun!
The barrel was made illegal by some Saturday Night legislation, and T/C quit making it....
http://en.wikipedia.org/wiki/Thompson_Center_ArmsAnd I doubt you would have any problem with accuracy .... *S*