At a shooting range is usually the best choice.
That is the National Shooting Sports Foundation. They promote shooting sports. Gun control attempts to prevent ownership of guns used in shooting sports. No gun= no shooting sports.
A shooting iron is a gun.
The slowest shooting machine gun ever made would have to be the Colt 1895 best known as the Potato Digger. It had a rate of fire of only 400 rounds per minute.
Use helium balloons, let them go and shoot them with you chosen gun.
by shooting it with a gun.
practice
Gun clubs, shooting ranges
Shooting solder at a special solder shooting range
The Gatling gun.
Depends on where the gun range is.
The one you can afford and are competent with. Without knowing your price range, no way to answer.