32 ACP is a semi-rimmed straight handgun cartridge. It is a relatively old cartridge, having been introduced in 1899 by John Browning. It was designed for use in semi-automatic pistols, and it is still in use today. 32 ACP ammunition is typically loaded with a 71-grain bullet.
Auto ammo is a general term that can refer to any type of ammunition that is used in a semi-automatic firearm. It is not a specific type of ammunition, and it can vary in size, shape, and power depending on the firearm it is being used in.
