In this Brass Fetcher video you can see the core hollowpoint part of the slug expand and penetrate completely through the block while its petals separate almost immediately after impact, flying in six other directions.
Yep, do not want to stand in front of these, ever.
Check out the Dupo 28 product page for specifics.
- Slug weight: 28.0 g, 430 gr
- Muzzle velocity: 445 m/s, 1460 fps
- Muzzle energy: 2770 J, 2040 ft-lbs