Centerfire rifle ammunition will just eat up metal targets. Even cast bullets in a rifle will create pits.
A bud of mine ran a range in El Paso. He was able to get Armored Personnel carrier hatches for the rifle shooters. He said that those just got shot up by the rifle shooters, that there was nothing that would not Swiss cheese in short order 300 yards or closer.
His solution was to buy engine blocks. They were cheap and disposable.
If I'm not shooting, I'm reloading.