I have tried many times to set off BP with a single jack and anvil but to no avail. I have shot through a couple of containers of BP trying to set them off like tannerite, but again, no joy. Even with the old trusty 25-06 traveling at 3840 fps.
Of course even hammering C-4 won't set it off, even if it is burning. But a det cap from flash powder sure will.