Greetings @Longranger,
Thanks for your reply. Julian Hatcher spent his whole career in the US Army working in interior and exterior ballistics. He described primer appearance as practically worthless for estimating pressure in 1946. Nothing has changed since then. There are many factors including headspace that make it unreliable at best.
Quickload estimates pressure based on velocity from what I understand and the two are linked. I think that the best data we have is the pressure tested data from the powder and projectile companies but these are kept a little low as a safety factor for variations in components and also the existence of older and supposedly weaker rifles chambered for the cartridge.
As stated in the OP this thread was started to give me a better understanding of pressure estimating techniques in use prior to some possible articles for newbies. That is still the plan although the path to the goal is getting longer and windier.
Next post there will be some data on my current methods.
Regards Grandpamac.
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