Poop Head
Judge me.
Actors have been killed by wads fired from blanks in the past.Obviously you do not know what a wad is in a bullet/shell casing.
Spit wad was a metaphor to explain the force of an object ejected at velocity through a tube.
I have had plastic wads out of a 410 shot gun go through 1/2 plywood.
Maybe you have seen the equation.
P=m x a.
That should explain the physics, but not the reason for the tragedy.