[quote=Warrior in the Shadows]Why not just do ammo caps, make people count rounds, and make logical restrictions on a combat loadout?[/quote]

That just encourage's the badass gunslinger approach. Suddenly you want every bullet to hit or it's a waste and will harm you IC. Players get far more worked up being told they missed something if ammo is a limited resource rather than a narrative tool.

That being said though, like with all RP and system flaws. It can be ignored/avoided with a mature and skilled enough group of players.