Guys, shooting steel that is not flat is asking for trouble. Those dimples and welded spots are going to send bullets, splatter, jackets back at the shooter. Maybe not today or tomorrow, but it will happen, it will be unpleasant, and someone will get hurt.
Those dimples and craters will but I've never seen a bump do it. I don't see how it possibly could and I've shot them from as little as 10 yards away. I have had a little splatter come back even off flat ones up that close. I'd recomend safety glass for any thing, including 22's, when shooting any kind of steel at less than 25 yards but nothing I think would break the skin.
3/8 mild steel
I've shot some steel before at different ranges, thickness, and with several calibre rifles and hand guns.
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