Hobie1
Thanks. Those links help a lot.
It makes no difference--and probably was developed for safety reasons--but I kept wondering why they were not all the same size--size wise, not power wise.
I was in the dark about powders and temperture to a large degree----but had a feel for different grain structure effecting/affecting burn rate.
I just was very curious what the primer did that could effect the burn rate other than amount of explosion.
It was all just a curious question.
Your links helped.
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