30 cal AP is level IV.
Steel plates suck. Spall and splash.
Coat it with truck bed liner and that will solve your spall/splash problem. In a world where you can't go buy another ceramic plate after it's been shot, a steel plate makes more sense. Now, if you could easily replace your ceramic plate, then that would definitely be the way to go.
Or a very good multi-hit plate like the AMI TAC3S would help.
I think ITAR would prevent you from getting those. Canada might be exempted though.
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