What is the main difference between centerfire and rimfire ammunition?

What is the main difference between centerfire and rimfire ammunition?

• A. Rimfire primer is in the rim of the casing
• B. Rimfire uses a liquid propellant
• C. Centerfire has no primer
• D. Rimfire uses a separate ignition system in the stock

Answer: (A)

The main difference is where the primer is and how it’s ignited. In rimfire ammunition, the priming compound is formed into the rim of the cartridge base, so the firing pin crushes the rim to ignite the powder. In centerfire ammunition, the primer is a separate component set into the center of the base; the firing pin strikes that primer, which detonates and then lights the main powder charge. This distinction leads to practical differences: rimfire is typically used for smaller calibers and is not reloadable in the same way centerfire is, while centerfire cartridges are capable of higher pressures, broader calibers, and are routinely reloadable.

The main difference is where the primer is and how it’s ignited. In rimfire ammunition, the priming compound is formed into the rim of the cartridge base, so the firing pin crushes the rim to ignite the powder. In centerfire ammunition, the primer is a separate component set into the center of the base; the firing pin strikes that primer, which detonates and then lights the main powder charge. This distinction leads to practical differences: rimfire is typically used for smaller calibers and is not reloadable in the same way centerfire is, while centerfire cartridges are capable of higher pressures, broader calibers, and are routinely reloadable.