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First, I'll appologize for not answering your question. Next, I'll appologize if it sounds as if I'm getting on your case. But please be careful with your language. Shells do not by definition "detonate." In order for a substance to detonate it must create a wavefront moving faster than the speed of sound. The only reason I mention this is that the government would love to outlaw fireworks in this country and if we in the business/hobby talk about our products as high expl*sives the government will do just that.
I hope others here can be of help with your question. Be safe and have fun.
