You can buy ammo SDU's from the ammunition vending machines, they will increase the max ammo capacity, and grenade capacity. Depending on how far you are in the game, you will be offered the green one, purple one, or orange one, which increase the maximum capacities to new levels.
Be more conservative next time, wait for the destroyer to produce the tentacles with the glowing purple segments, destroy these as they can drop health and ammo like regular enemies.
You have to be more specific. Looking at the "Magazine" or "clip" can give you a good idea on how much ammo a weapon can hold. Also the caliber size of the ammo is a factor to how much ammo is in a "Magazine/clip".
Lazer ammo dropped by a zobie is +100. The max ammo ANY gun can have in the game is 9999. Trust me, its possible :D
Depending on configuration, 6-13 rounds.
It would be very expensive, but, it is possible.
It is not possible to purchase ammo further than the 5 you receive each time you visit your crib.
Change in ammo, change in weather
Not very easy, but, possible.
No cheats for unlimited ammo for PS2.That is possible in PC by Using a trainer.
Rate of fire, ammo capacity, great reliability, long range accuracy, better sights, faster loading times
No, there is not an infinite ammo cheat in GTA IV. There is a way to get full ammo with any weapon cheat (Weak, Strong, Health & Weapons) by just activating the cheat until there is full ammo capacity.
No, the crossbow has terrible accuracy, reload speed, ammo capacity and range. therefore is only good for hunting animals