If you are just using mild steel, you are pretty much wasting your time mate, no matter the thickness. With mild steel you will destroy the gong first session.
Do yourself a big favor and get hold of some wearplate. Mine are Hardox 450 12mm, others use bizalloy, all just different brands of wearplate. The bullets just disintegrate on the surface and dont damage the plate at all. Will last forever.
I have two plate sizes, a nice big 500x500 with a 2-3" bull painted in middle. (nothing worse than missing a small plate at range and not having a clue where you have missed. Much easier to get everything sorted if you have a bigger plate, so you can still see the splash from say 700 yards, then make adjustments and shoot again.
Then i have an 8" plate for when you want to make it a bit more challenging.
I hang a chain between two wharratahs and then hang the gong off the chain with D shackles and steel spring carribeaners
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