The Orange Box 360 cheats.
Refill ammo supply for equipped weapon in Half-Life 2:
Y, B, A, X, RB, Y, X, A, B, RB.
Why do i remember this?
It was frustrating to use. I started to use it when i got the crossbow and enjoyed having a scoped weapon, my only complaint for Half-Life 2 being that it doesn't really tailor itself to people like me who enjoy precision shooting, but at that point i had the Gravity Gun so pressing RB switched weapons. I finally figured out that i needed to make it so that the game would cycle between the crossbow and gravity gun when i pressed RB and started the sequence with the gravity gun equipped.