Those can be real ball busters if it was gravel ya were standing in !.......:o)
we used to blow buildings with those ....made flour charges. small bag of flour on a simulator, pull as ya run for the door and pull second one as you exit and throw back into room as 2nd man slams door and di di’s to the bar ditch for cover with ya .......bang then Kaboom !
Ahh chemistry......
OUCH!
Thankfully I didn’t know that then, or I’d have whizzed my drawers on the spot.
Those worked real good on the old wooden boxcars used for moving ammo between storage igloos, too. We got tasked with ruining a bunch of those, with the caveat that we couldn't burn them because the underframes and running gear had to stay in one piece for rebuilding.
Okay. 215 dust initiator charges later, flatcars instead of boxcars, and numerous notwell-stacked piles of splintered lumber for the woodchipper.