Once a type of turkey call is selected, practice is the key to success. Respect property rights of others. Be positive of your target. After you pull the trigger, it's too late. Make sure that the gobbler is within sure range of the shotgun and shoot at only the neck and head area.
Body shots kill turkeys only a small percentage of the time.
Hens are not legal targets in the spring. Be sure you're shooting at a gobbler during the spring season. Do your homework before season - scouting, practice calling, patterning your gun. If another hunter is working a bird, don't spoil it by trying to call the bird to you or spooking the bird. This is very unsportsmanlike.