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As an update to my first post, I've since used 24/48/72 and the explosion propagates through the lot.

I also had to look up life hack, new term to me also. I consider myself lucky to be able to do a limited amount on the computer. Been about a year since I learned what a selfie is.lol

Small reactive air gun target was here all along. Pull string novelty device were all familiar with. Cut them off a 1/4" from either end, bundle 6 together with scotch tape, tape to target, wahla,...