This thread is about a wild effort by the "Smarter Every Day" video guy, Destin. I found it based on a link posted over at The Firing Line.
https://www.youtube.com/watch?v=tcQVrD7RnNI
I added a comment on You Tube:
Each individual bullet is shattering. With a perfect hit, each bullet is coming to a stop in the exact same way as if it hit a very heavy hard flat plate. To figure this out, consider shooting a heavy hard flat plate with different bullets and loads until you can find a bullet that does not shatter. Most cast bullets have antimony that makes them harder but also more brittle. Harder bullets would be good but you also need tough. Folks have tried alloys with a good bit of copper and tin and less antimony to get "tougher". Different profiles may also be worth trying (i.e. a short bullet vs. a long bullet, a wadcutter vs a round nose).
Anybody here have an idea on what kind of bullet would have the best chance of not shattering on impact.