we are only talking about a first game remember. Not a long term tactic! There is also the fact that you have to learn your way around the site so charging in isn't a good idea when you don't know where you are charging to
1000 rounds will probably be plenty although I suspect it may be 2500 or 5000 supplied with a rental gun. My pistol holds 110 and my G3 holds 420 per mag (I counted in both cases yesterday). I have a full pistol mag, 3 G3 mags plus 3 spares bags each holding 420 and I don't expect to use any bags on Sunday. It will of course depend on scenarios they set up, how I play and where I position myself