Jay emailed me a link to The Brass Fetcher Online. It looks like it has been around for years but I never came across it. It is amazing. They have gel test results, including photos, for a while range of cartridges, often more than one brand. Everything from .17 HMR to 5.7x25mm to 12 gauge.
Observation from testing the above Federal slug:
The 16x6x6 inch block, upon being struck with the projectile, flipped 1.5 feet into the air and off of the test stand. Permanent cavity was 6” in diameter, until 10.5” depth.
That is why shotguns scare the crap out of me. When I am in a gun shop and hear the clack-clack of a 12 gauge pump, without noticing a customer handling one, I almost always get a fright!
They also offer a ammunition testing service. For a price they can test your favorite brand of defensive or hunting ammunition to ensure it performs as expected.
Thanks to Jay for the link.