I just made my own for handguns/.22 and I bought some AR500 targets from "qualitytargets" on ebay for a really good price.
Went to Local welding shop and they gave me 1/4" and 3/8" regular steel scrapes...Then went to lowes and bought 3 saw zaw 21 tooth blades, chain, 1/4" shackle, and a carbonite 3/8" bit. I cut three targets...Took about 30 min of actual cutting and only used two blades. I cut a 2x2", 5x5", and a 8x8". It was harder to drill the holes than it was to actually cut the steel. I have used them for .22 at 100 yards, 200 yards and I used them for 9mm around 25 yards. Didnt even phase it.
I got a 10" circle out of AR500 so I can make a light weight stand to take out to to the long range. We only have steel at 600 and 800 and want to dope my rifle in at a few different distances.