Using a small rifle primer in pistol ammunition is generally not recommended. Below are a few vital factors to look at: ### Discrepancies in Layout 1. *Primer Composition*: Smaller rifle primers generally have a more challenging cup than little pistol primers, built to resist higher pressures affiliated with rifle cartridges. https://winchesterlargepistolprim84727.blogproducer.com/38126791/using-a-tiny-rifle-primer-in-pistol-ammunition-is-mostly-not-suggested