You can also put the explosif in a steel trapezoid with the wide part open towards the front. Basically a claymore, but you'd have to manually set it off.

There's a mix that's designed to work with rim fire and other lower-velocity stuff. It's not as powe4ful, but is more-easily triggered.

A dumb friend put some in a chewing tobacco tin and launch it from a skeet launcher to shoot with a shotgun using bird shot. I personally would not be that close to anything I was blowing up, even with a plastic shell.