Quick Answer
For consistent reloading performance, top contenders for best primers include CCI BR-4, Winchester Large Rifle Magnum (LRM), and Federal Gold Medal Match (GMM) in 215M, while the best specific primer for a given cartridge can depend on the rifle and load specifics.
Choosing the Right Primer for Your Hand-Loaded Cartridges
When selecting a primer for hand-loaded cartridges, it’s essential to consider the type of rifle and specific load you’re using. For example, the CCI BR-4 has a reputation for providing a consistent ignition, making it ideal for long-range hunting applications where precision is crucial.
Primer Selection for Specific Cartridges
For cartridges like the 6.5 Creedmoor, the Federal Gold Medal Match (GMM) in 215M primer provides a reliable ignition, while for the .308 Winchester, the Winchester Large Rifle Magnum (LRM) primer is a popular choice. When selecting a primer for a specific cartridge, consider the rifle’s action type (e.g., bolt-action, semi-auto), the desired burn rate, and the type of propellant used in the load.
Primer Sensitivity and Over-Pressure Issues
When loading cartridges, primer sensitivity can be a critical factor in achieving consistent performance. Over-priming can lead to increased pressure, potentially causing damage to the rifle and cartridges. To minimize the risk of over-priming, use a consistent primer seating depth and check the pressure levels using a chronograph or other pressure-measuring device. For example, using a primer seating depth of 0.015 to 0.020 inches can help prevent over-priming in many rifle cartridges.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.