Using a small rifle primer in pistol ammunition is usually not advisable. Below are a few important points to take into account: ### Discrepancies in Structure 1. *Primer Composition*: Small rifle primers usually Possess a tougher cup than small pistol primers, designed to withstand bigger pressures associated with rifle cartridges. https://winchesterprimerseurope95939.liberty-blog.com/31504560/using-a-small-rifle-primer-in-pistol-ammunition-is-generally-not-recommended