Good method to obtain a relative comparison

by JohnKDM, Wednesday, August 28, 2024, 20:47 (85 days ago) @ JimT

There was a guy that made a tester and recorded relative numbers for primer strength. I revisit the article occasionally;

https://castingstuff.com/primer_testing_reference.htm

From the pic, it looks like his tester used a single shot 22lr rifle receiver to ignite the primer.