Stan I apologize I came across harshly which I didn't intend. I thought I was helping by stating primer mixtures are formulated for temperature and duration and volume of hot gas. Various primaries are used by the different primer makers. Some mixtures contain otherwise inert compounds to help ignite the powder. It would be tough even for explosives chemists to sum and compare all those considerations against other primers and best we can do is to use the powder company charts for a certain load and one primer against another. Brisance isn't the right word and I never heard another word that correlates all I wrote about.
Thank you, Dogfox. It's all good, no worries. I could have been a bit less knee-jerk myself. I do appreciate your comments about how primers work, and I also did learn that brisance is not the exact term to describe what I need to know. Maybe ........... what I need to know can only be determined by testing the exact load(s) I'm interested in at Tom's.
The reason I am trying to be so careful is that the loads I will be substituting Cheddites in are already generating around 13,000 psi with other primer makes. It is a 3/4 oz. .410 load. I know .410s run at higher pressures, but I don't think I want to get much higher than 13K.
Don't think too badly of me if I use the term "brisance" again in conversation about primers. We'll both know that it isn't correct, but it will me save lots of typing explaining myself every time, until we figure out a better term to use. I'll try to remember to use it in "--------"s, to qualify it.
All my best, SRH
