I hunt goose, duck, and deer. so I want to branch out my hunting into turkey. I have a 870 super mag. The Super mag barrel its awesome for duck and goose. deer I use a cantilever riffled barrel, to keep the rail clear. Now getting down to the turkey hunting part. I know i need the extra full choke. I also know that there is special turkey barrels. What makes it a turkey barrel? any pointers on turkey hunting and turkey gun set ups?