Single and dual metal spinners I've seen but I've never seen a tree out there. Bring it just in case. Then when you get there ask around to see of everyone is cool with it. I don't think anyone will really care as long as it doesn't harm anyone or interfere with their practice.
I think technically you aren't supposed to shoot metal targets but lots of people shoot steel there so I don't think anyone would have a problem with it
No. Designated targets only. The rules are posted at the range.
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