One of the greatest responsibilities that a hunter has is to choose the appropriate firearm and ammunition for the hunt. The caliber of the rifle, gauge of the shotgun, weight of the bullet and ballistics all play a part in a humane, one-shot kill. The firearm must also conform to the hunter's shooting style and preferences so that the hunter can be a good marksman. Resources for this choice include firearm manufacturers, other hunters and wildlife officers. It is important to remember that there are laws governing the types of firearms, ammunition and number of rounds that can be used while hunting. It is the hunter's responsibility to know which firearm and what ammunition is legal and appropriate for the game they are hunting.