I was at the range yesterday while a new member orientation was going on. It was said that while it's obviously not required, it's an informal suggested rule that if someone asks about something you're shooting to offer a few rounds. I think this is a great idea.
I had the distinct pleasure a while back of shooting next to a ~15 year old and his father taking a class, shooting for the first time. The 15 year old, after shooting a .38 asked if he could shoot something bigger. The instructor apologized that he hadn't brought anything in a larger caliber. I chimed right in and said, "You can try my 1911!" When I finally had to leave, I'd left behind a kid and a father with great big grins.