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I think a lot of it has to do with how busy they are.
I tend to avoid busy times and go in the middle of the day during the week when I can, and theres usually only a couple people there or sometimes just me. When it's like this they get a little more flexible with rule enforcement especially if you've been talking to them or asking advise.

I've never been told to limit my magazines to 10 rounds, and I've violated the one shot per second rule before and never had anyone talk to me about it (though i didnt do it repeatedly just a couple times)

Now its a completely different story when they are busy, everything is very strictly enforced. And many people choose to argue with the RO's which is just stupid, follow the rules.

every range in DFW i've been to has very similar rules.