Utilizing a compact rifle primer in pistol ammunition is mostly not encouraged. Here are some critical factors to take into consideration: ### Variances in Layout 1. *Primer Composition*: Small rifle primers commonly Use a more challenging cup than smaller pistol primers, intended to resist increased pressures associated with rifle cartridges. https://winchesterprimers12356.mybjjblog.com/using-a-tiny-rifle-primer-in-pistol-ammunition-is-normally-not-advised-44533714