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No typo. I had (but currently cannot find ....??) a very detailed report from trials done in the USA on AR500 plate damage done with various caliber and projectile design.
The conclusion was that...

All steel targets should be BIS500/AR500, arranged so that the impact face is square to the shooting position, and leaning forward at the top of the target, 20deg off vertical, to ensure that the...

We used to shoot bowling pins at three gun with the shotgun. Had to stop doing it because of steel shot bouncing back and hitting the shooter. Lead seemed to be ok but it wasn't worth the risk.

I personally saw a fellow hunter get hit by two lead pellets ricocheted off a gooses wings. One went through his ear leaving a nice hole and the other lodged just under his rib cage.