Using a modest rifle primer in pistol ammunition is normally not advisable. Here are some critical factors to consider: ### Differences in Design and style 1. *Primer Composition*: Modest rifle primers generally have a more difficult cup than smaller pistol primers, designed to resist bigger pressures related to rifle cartridges. https://winchester-41-small-rifle86173.spintheblog.com/31756245/using-a-smaller-rifle-primer-in-pistol-ammunition-is-normally-not-advisable