# CCI Mini-Mag .22 LR 40 Grain CPRN: Feeding Geometry and Bullet Profile Engineering The feeding reliability of CCI Mini-Mag .22 LR 40 Grain CPRN is strongly influenced by its round nose projectile geometry. The CPRN (Copper Plated Round Nose) design is optimized for smooth chamber entry and consistent magazine feed angles. In rimfire systems, cartridge geometry plays a larger r... https://bulkammotogo.com/product/22-lr-40-gr-cprn-cci-mini-mag-0030-5000-rounds/