Primers

Primers for Reloading Ammunition

Percussion Caps, Pistol Primers, Shotgun Primers & Rifle Primers

Primers are an often overlooked component of ammunition. These small metal cups contain a sensitive explosive compound that ignites when struck by the firing pin, setting off the smokeless powder charge in a cartridge. 

Types of Primers

Primers come in different sizes and types, each suited for the various cases and ammunition needs. The most common types include:

• Small Pistol Primers – Used for many handgun cartridges, specifically with small primer pockets, offering reliable ignition.

• Large Pistol Primers – Designed for cases with large primer pockets, often for higher-pressure handgun rounds.

• Small Rifle Primers – Built to withstand higher pressures found in rifle cartridges.

• Large Rifle Primers – Used in larger rifle calibers for consistent ignition.
  Each also has variations available, such as Magnum, and or Match/Benchrest.

Why Primers Matter

1. Ignition Reliability – A properly selected and seated primer helps to ensure your ammunition chambers and fires consistently.

2. Load Consistency – Choosing the right primer can impact velocity and pressure, affecting accuracy. Generally speaking, using the published load data is the best and safest option for reloading.

3. Customization for Reloaders – While it is typical to use what is called for in the published load data, experimenting with different primers can help fine-tune ammunition performance. Always use caution when reloading, and especially when experimenting with new loads.

Safe Handling Tips

• Store Safely – Keep primers in a cool, dry place, away from heat or open flames.

• Use Proper Seating Tools – Never force primers into a casing to prevent accidental detonation.

• Keep Work Areas Clean – Contamination from oil, dirt, or moisture can degrade primers and cause misfires.

Though small, primers play an important role in every round fired. Understanding their types, importance, and proper handling can help reloaders make informed decisions. Whether you're stocking up for reloading or learning about ammunition, knowing how primers work ensures safety and reliability in every shot.