steel targets...making my own

So I've got some scrap tool steel chunks laying around. Targets made from AR500 are kinda pricey, the thought crossed my mind to make my own out of the tool steel I have on hand and heat treat them. Plus I'm always looking for a good project.

Has anyone made there own hardened steel targets? These will be shot at with small fast rounds .204, 22-250 and .223 at 200+ yards.

The sites I've looked at online say that AR500 is 470-520-ish brinell. That translates to about 50HRC-ish. So I thought I would start there as far as hardness. (I don't have access to a brinell scale.) I'm wanting longevity but I don't want it to crack in half from being too brittle either, I normally use paper targets. As far as thickness I was thinking 1/2".

Any input in regards to smaller higher velocity rounds against steel targets would be greatly appriciated, be they purchased or homemade.

Thanks

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