# CCI Mini-Mag .22 LR 40 Grain CPRN: Primer Sensitivity and Rimfire Ignition Dynamics CCI Mini-Mag .22 LR 40 Grain CPRN relies on rimfire ignition, where the priming compound is distributed around the inside rim of the cartridge case rather than centralized as in centerfire ammunition. This fundamental difference makes ignition consistency a key performance factor in rimfire reliab... https://bulkammotogo.com/product/22-lr-40-gr-cprn-cci-mini-mag-0030-5000-rounds/