I have used pistols on the 100 yard range and brought 4 guns. I would think if you're respectful of others space then you would be fine with whatever you brought.
Yup, shoot whatever you want on the rifle range. I have seen people bring a dozen guns, not an issue, be safe. Funny question, did you go to Calabasas High? I know a P McMullen from there
Agree with Ryan above. If I'm only shooting a pistol i normally don't go in the 100, but if you're using multiple weapons, then sure. All calibers are allowed on all ranges.
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