It wasn't uncommon at our old 50ft indoor range to catch a rebounding lead pistol bullet in the kisser once in a while.
The backer plates were steel and angled,,all good there and no problems. But they weren't rated for jacketed bullets so the range was limited to 22rf and lead centerfire handgun rounds only. They had a FPS limit for CF too but I can't recall what it was.
But people being what they are and the range being available 24/7 by key-card,,some would come in at odd hours and unload with jacketed and hardball. It caused small dimples in the plates.
Since it was a Bullseye Target type range,,they were all in pretty much the same small area on each backstop plate.
When you were unfortunate enough to land a bullet (especially a 38LSWC it seems) just right it would come right back at you.
They didn't come skipping & rolling back to the line ,they came back at the same level they were shot, so you caught it in the shoulder or head usually.
The plates finally got upgraded and fixed the situation,,but I can imagine what can happen when shooting steel targets in various conditions and positions and with heavier loads. I do know of one individual that shot himself in the thigh,,a rebounding pistol bullet from taking a shot at an old junk car's bumper in a farmers field. He's lucky to be alive.
Just be prepared, don't skimp on the safety equipment.
I'd have lost my right eye if it hadn't been for the glasses (I wear them anyway). The rebounding W/C to the forehead,,well not much you can do to protect against that.
Odd thing,,you can see it coming,,just a blurr,,but you can't get out of the way!