Hey guys, I know all about AR500 and I have a few 1/2” plates to use for my rifles. AR 400 on the other hand is more difficult to find out its abrasion resistance in regards to bullets. I was looking to buy some knockdown targets like rams and pigs for handgun only. (Max would be a 44mag at 50 yards). AR400 is much cheaper. How does it compare to mild steel? Is mild steel acceptable for 9mm at 50 yards?