When I go to the range to practice I have 7 magazines that I take in my range bag. I'd rather shoot more and spend less time reloading.
However I've never see anyone there with more than one or two. With my extra magazines and Shoot-N-C targets I almost feel a bit over the top.
Also I noticed for the first time they have signs up saying only load 5 rounds. Oops. I've been loading to capacity (10). The RSO never said anything to me but maybe thats because there usually aren't more than 2 or 3 people there, yesterday I was the only one. Either way I'll make sure I limit my loading now so I don't break the rules.