That is awesome and I think I have seen that before somewhere.
Does not look too hard to make. other than the perfectly peeled projectiles.
maybe wet sand and fire into it .45 cal??
I researched it and firing the bullet into 30" tall container of water.
Find the correct velocity and bullet and you are set.
So that is what I need to do with that roll of carpet and huge container of water.
Carpet acts as sound deadening device .. shoot through the center of the roll.