I once witnessed a very large and powerful hunting cartridge ricochet off of a m/s plate at about 40y and come back over our heads. Scary stuff.
On inspection of the plate it had all but fully penetrate the 10-12mm plate leaving a massive crater in the plate which had basically let the bullet turn itself inside out and back out the crater,If it had been a hard plate the bullet would have had no choice but to flatten and disintegrate.
I beleive it can be done safely at close range,but the plate must be thick and hard enough to not deform at all with the cartridge being used,and the plate must be set or hung on an angle deflecting downward which is easy enough to acheive by welding hanging mounts to the back of the plate so it naturally leans forward.
Not an issue with long range plates as the bullet will almost always arrive at the plate on a downward angle.
This is a neat video.
https://www.youtube.com/watch?v=QfDoQwIAaXg
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