HB 400 (or 450, or 500) plates for local shooting range 1

[kingnero]

Our local shooting range needs to renew the backstop plates. No info on the quality that was used previously, so no useful empirical data.
I tried googling but I didn't quite found what I am looking for.

Is there a known (empirically determined) relationship between calibers, distance, steel quality and thickness ?

More specifically, I am asked to write the tech spec for a steel detailer to provide a frame (with removable AR400 (or similar) plates that can be lifted out by 2 men).
This is a handgun range (no magnum ammo), with the backstop at 25 m or 80 ft). Hoping for a lifetime of at least 10 yrs.

Seeing the high steel prices, and the limited budget of this range, I'd try to avoid going overkill in quality and thickness.

Any tips or known data is much appreciated!

 

[WKTaylor]

DANG.

OK, I'm officially a dummy...

http://www.rivermenrodandgunclub.com/shot-size-chart--recommendations.html

Regards, Wil Taylor
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