Welcome to the sport or should I say obsession of turkey hunting.Every gun is going to preform differently,so I suggest trying various sizes(4,5,and 6) and also a couple different manufacturers(Winchester,Federal,and Remington) Try these before the hevi shot,it's costly and you can probably find something your gun likes in the other offerings for cheaper. If you have a couple buddies that hunt may bee they can let you try a couple of their shells to save a bit of expense.Good luck