Hi, brand spanky new here.
I was just reading through some of the post and this thread caught my eye.
Has anyone considered if this is a lead reaction? I always wash asap after shooting or teaching, and have my clients wipe too with the lead wipes.
The OP's reaction seems to be limited to the areas exposed to the blowback. And hands and face can be especially sensitive.
Perhaps putting on a benedryl cream to the exposed areas, wearing long sleeves when possible, may help. I had a client once who was allergic to the lead and powder residue.