How much energy is required to ignite a primer?

This question is not very easy to answer, as it depends very much on how fast the firing pin strikes it. According to military specifications, dropping a steel ball from a given height must ignite virtually all of the primers. There are also rules where the drop height is low and none of the primers should ignite.

Introduction To Norma-USA:

Norma Oryx:

Norma Kalahari: