I don't know any indoor ranges here that don't allow steel core or case, but then I don't know all the ranges and all their rules.
But the outdoor ranges don't allow any steel that sticks to a magnet. As it poses a fire danger.
In fact, a few weeks ago at Oak Tree something started a fire, a brush fire up the hill when I was there. Within seconds it was a large fire.
We use a magnet to look for steel at Burro Canyon.
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