Piercd primers from 1920's - Reloading Methodology

Piercd primers from 1920's - Reloading Methodology https://systemz.online/reloading-methodology/piercd-primers-from-1920s AllGunStuff Discussion Board en-US Fri, 08 May 2026 01:19:17 +0000 wpForo 60 Re: Piercd primers from 1920's https://systemz.online/reloading-methodology/piercd-primers-from-1920s#post-7307 Sun, 21 Dec 2025 07:04:48 +0000
.. it does not make sense that something with less weight should cause more damage? Would that be due to the higher speed of the firing pin?

in this explanation, there is no damage from the firing pin itself

The stiffer spring and heavier weight stops the indentation in the primer from popping out to the rear.

and when it does pop back, it probably weakens that spot further by reducing elasticty from work hardening

An interesting concept, that the firing pin inertia can be overcome by the chamber pressure, causing a pierced primer.

This also might explain why less than max loads sometimes result in a small raised rim around the firing pin impact point.]]> Reloading Methodology 414gates https://systemz.online/reloading-methodology/piercd-primers-from-1920s#post-7307 Re: Piercd primers from 1920's https://systemz.online/reloading-methodology/piercd-primers-from-1920s#post-7306 Sun, 21 Dec 2025 06:31:03 +0000 Reloading Methodology Tripodmvr https://systemz.online/reloading-methodology/piercd-primers-from-1920s#post-7306 Re: Piercd primers from 1920's https://systemz.online/reloading-methodology/piercd-primers-from-1920s#post-7305 Sun, 21 Dec 2025 05:17:25 +0000 Reloading Methodology Ds J https://systemz.online/reloading-methodology/piercd-primers-from-1920s#post-7305 Piercd primers from 1920's https://systemz.online/reloading-methodology/piercd-primers-from-1920s#post-939 Sun, 21 Dec 2025 00:10:55 +0000
I've often come across posts on various forums where people enquire about their pierced primers, and seem sure that their loads are not over pressure. My opinion was always that the load is over pressure, the reloader just doesn't know it is.

This explains why primers pierce on normal loads. Especially in today's competition rifles where the weight of the firing pin assembly is reduced, or the firing pin travel shortened.

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