There have been a few people to use this method of announcing a baby’s gender to their families. A little binary explosive and some blue or pink powdered chalk is all you need alongside your favorite rifle of choice.
Here is one done with shotguns. Not sure what they used to get the powder to spew outward because it does not look like a tannerite explosion.
Here is one that got some people upset for stupid reasons. Here is an article about it. I don’t see the problem. He has proper trigger discipline and shot a target from a safe distance. Sure, they should be wearing eye and ear protection but I will let that pass.