Need to come up with an ELR target for 223 Rem (1100 -1760 yards). Don't think a T1000 hit indicator will work on my 2'x2' 3/8" thick of AR500. Thinking something like Mark and Sam After Work use. Something that will dent and knock off enough pain to see the impact without punching through. Energy upon impact should be roughly 200-300 ft/lbs. So far I'm thinking 11 ga carbon steel plate 2'x2'. Thoughts?