If I brought my .40 cal into the range, I'm 18 years old. Do I have to buy ammo or could I use my Winchester 40 ammo

If you're under 21 years of age you cannot buy pistol ammo at the range. But you can bring your own pistol caliber ammunition to shoot.

You can bring and shoot your own pistol ammo

Pistol ammo you can bring but rifle ammo you must buy from them. As far as your age, I don't know.

You can bring your own pistol ammo and shoot it at the range. You can also buy ammo at the range