# CCI Mini-Mag .22 LR 40 Grain CPRN: Reliability Degradation Curve in Extended Firing Sessions All rimfire ammunition exhibits a performance degradation curve as firearms accumulate fouling and heat. CCI Mini-Mag .22 LR 40 Grain CPRN is notable for flattening this curve compared to lower-tier ammunition. Instead of experiencing rapid reliability decline after a certain round thr... https://bulkammotogo.com/product/22-lr-40-gr-cprn-cci-mini-mag-0030-5000-rounds/