Ok i was sitting down just chilling and came up with a wicked game to play.
HALO . . . Nuf sed
We could play just like Halo, you die, you drop yur ammo thus limiting the ammo. If you have picked up ammo and now have empty mags, you take them back to the respawn. If they are not for your gun or past starting ammo amount, you leave them there. You can also reload here. yes there will be a bit of a problem with the gun variety, but there pretty much is at least 2 of each gun type. We would do a kill count like in Slayer or Team Slayer. We could also incorporate the beast and the 50's as stationary weapons. Alas, i do think the best place to play this is the range.