I use almost all 3/8" AR500 targets never any closer than 100yds with .233/5.56 green tips will ruin a target as will shooting closer than 100yds. At 400yds and farther with .223/5.56 one could get away with AR400 steel if however you are going to be using other calibers on the targets I'd push the distance to 600-700yds before dropping to AR400. I have two 4'x4' 3/8" AR400 targets at 1000yds that show zero damage even with 338's solid copper bullets pounding on them. At 600yds 1/4" mild steel will work for 223/5.56 but other calibers will tear it up. I can ruin 1/4" mild steel at 900yds with a 6.5 creedmore my buddy shoots right thru it at that range with his 300 mag.
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