Depending on what you want to break, they can be incredibly violent and energetic.
"We had to be a 1/4 mile away from the blast to stay clear of pressure wave and debris."
We probably should have been a 1/4 mile away when they touched off a charge set on a boulder that had a missed charge while building Cowlitz Falls Dam.
I was working swings. Day shift drilled all day and they blasted at shift change, generating about 3000 CY of rock that we moved out of the cut.
One day that had a big solid nugget that was out of the pattern, and rather than build a trail to get a drill to it, Kray Kray Coogan cooked up a shaped charge idea. Oh yeah. He was nuts.
We were above the cut in our yard where those young trees are on the right. CRACK!
Here comes this line drive head sized rock, traveling in a very flat arc. It bounced off the 3' diameter fender log <Bonk, splinters flying> and back down to the cut. Had it cleared the log it would have one-hopped through anything up there, conexs, equipment, us humans.