I started with a simple pneumatic squib, way back when.
But that doesn't work for powder.
So I upgraded to a triangular packet (originally designed for larger loads) which is beautiful for powder and probably my new preference for blood, too. (note to self: test inverted configuration).
Today I graduated to the brain cannon, with design help from my son Nik.
Awesome.
There are chunks of bloody brain all over my front yard.