I have 12mm Biz400 and would recomend 16mm
I would not recomend mild steel as after some use its harder to spot you hits as it gets so dented and pitted (yes I have plenty of munted mild plates up to 40mm thick but still have my first 4 12mm plates and 3 are fine....one got left and got a smashing at 100 with all sorts of cals) where as biz 400 a coat of paint and its like new again (12mm should be OK for 308 past 200 but 16 seams to take anything you throw at it)
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