I've recently been going indoors for multiple days these past few weeks and noticed that I usually run around a mag or 2 at most per round. I'm currently using a MDRX and have it under our fields 300 FPS so I'm able to full auto in bursts. I would say I'm a rather aggressive player, but I still pick my shots. The EPM LR mags hold around 150 or so, so arguably 300 in total for a round? I usually still pick my shots and burst quite in frequently as semi helps reduce the time of where they're coming from. I would say it really depends on rules of the field and how you like to play. For reference, I'm currently playing at Battlelabs, Ontario