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Quoted:
And the big thing for when you get that sheet is to make sure that when it is cut that it stays at 500b and doent soften.
I've used 1/2" thick mild construction steel for shooting at but the minimum I've shot it at so far is 300yds. At that distance with a .223, I get a very small dent and the steel will handle thousands of rounds. I'm not sure how it would react at 100yds though.
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It WILL crater and throw schrapnel.. See my above post..
And there you have it...dont shoot at it under 300yds. I would probably say dont keep it as a static target also, I set mine up to swing and I get a small dent with .223 and a moderate sized dent with .308.