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Old June 4, 2014, 08:42 PM   #11
Bart B.
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Join Date: February 15, 2009
Posts: 8,927
Use a magnifying glass to see the rounded edge of a new primer then compare it to a fired one. Higher pressures tend to flatten the primer cup and make that edge sharper. Compare the side of a pushed out fired one to that of a new one. Really high pressures flatten the primer enough that it's wider at its top than the sides. Check out these pictures of low, normal safe max load and way too hot; left to right:

https://www.google.com/search?q=flat...9%3B1280%3B960

Last edited by Bart B.; June 4, 2014 at 08:48 PM.
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