I have .22 only targets on my range. They're painted a different color so that everyone who shoots there knows what they can shoot at what. White is centerfire pistol, Yellow is rifle rated, and Red is .22 only.
Despite that, a new shooter shot the .22 targets with a light .38 special with a plated 158 grain RN bullet. It damaged some, others were ok. The ones that were damaged were by far and away the thinnest targets, about 1/8 inch, while the thicker 1/4 inch targets survived ok. I definitely glad they weren't hit with anything stronger. Since she was a new shooter, these were truly powderpuff loads.
On the damaged ones, they were just plates so I hammered and welded to a flat surface again, and they seem to be holding up just fine now with .22s again.
That's my experience. I'd say stick to what you are supposed to shoot at them.
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