Using a smaller rifle primer in pistol ammunition is normally not advised. Below are a few essential points to think about: ### Variances in Structure one. *Primer Composition*: Smaller rifle primers commonly Have a very tougher cup than compact pistol primers, made to withstand bigger pressures connected to rifle cartridges. https://winchester200primersinsto36160.alltdesign.com/using-a-smaller-rifle-primer-in-pistol-ammunition-is-normally-not-advised-50975956