If you can hit a total of 3 or more shots on the head and neck using #4,#5 or #6 lead shots at 30 yards you are good to go, no matter the cost of the shells, including 2 3/4 inch field load shells. If planning to shot at 40 yards then find a load that will place 3 or more shots on the head and neck using #4 lead shots. Anything farther than 40 yards just experiment with #4 lead shot which is the heaviest you are allowed to use and carry over the most energy at that distance.