I wouldnt stress much about the "hard core gongs" for bigger calibres.
KiwiGreg shot one of my 16mm Biz400 Plates with his 416 at 250 yards. Was quite impressive to say the least - maybe Phlip Phlop will post up the photo. But in reality you dont get a much bigger cal.
The fast 20cal rifles on the other hand - they do a fair bit of damage
If you are using mild steel, you will get craters no matter what thickness you use.
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