It worked just fine in mine in 1978. One pound of FFFFg powder, minus about a half cup to make a three food "fuse" (NOT NEARLY LONG ENOUGH)!!!
I had to fill in a washtub size hole and I got my plastic lenses speckled, my tee shirt ventilated, my hairline raised, and a spectacular red sunburn.
I never had another gopher.....and no one called the cops or firefighters.
Nothing long with getting old. I'll be 81 in two more days. The biggest issue I keep coming into contact with is looking at people my age and thinking they look so damned OLD!
I was young once but I wasn't very good at it.