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I remember a glitch where you could double the ammo for any gun.
First, you have to select the gun you want more ammo on, then go to one of the rampage missions, take it, then just let time run out. When it does, it'll double the ammo of the gun you were holding. I don't know if its all rampage missions, but the one in Little Haiti does it.
3 years, 1 month ago on Grand Theft Auto: Vice City Glitches (PS2)