I have gone through checkpoints which involved ETD swabbing of my bag, and said bag had within 24 hours prior had in it a fired handgun. I've also used my range bag (once) as a carry-on bag--carefully emptying it out to avoid any issues--and not had it alarm.

Of course, I've also had that bag alarm on the swab twice, when it hadn't been anywhere near anything remotely explosive for months.

That said, I would fully expect GSR to set off both ETD and puffers due to the nitrate contents.