But "energy dump" is meaningless.
Take a ping pong paddle and a ping pong ball and hit a guy in the head with the hardest serve you can manage.
Then take a golf club (the driver) and a golf ball and hit that same guy in the head with the best drive you can manage.
Note the different effects on the target.
Neither the ping pong ball nor the golf ball will cause a permanent wound channel.
And neither one will give any penetration.
And neither one will destroy tissue in its path.
But the golf ball could kill the guy.
The golf ball delivers much much greater energy to the guy's head.
Energy delivered to the target matters.
If you don't believe me, you provide the test head and I'll provide the ping pong ball and the golf ball.