Using a tiny rifle primer in pistol ammunition is generally not advised. Here are some important factors to take into account: ### Differences in Structure 1. *Primer Composition*: Modest rifle primers typically Have a very harder cup than modest pistol primers, designed to resist better pressures related to rifle cartridges. https://winchester-primers-in-sto67901.blogoscience.com/37537398/employing-a-modest-rifle-primer-in-pistol-ammunition-is-mostly-not-recommended