Schriffle slugs?

Has anyone tried these things?

how do they shoot? hows is the clean up? hows the recoil?

I know this thread is old but I have them and shot them. Actually I shot one , felt like my shoulder was out of socket. 365 grains at 1900 fps. Feels like there s a mule inside each slug. Was just as accurate as Winchester partition gold. Which are a lot lighter. No deer should be able to walk away after being hit with these.