GTA: San Andreas - how do you reload?

Archived from groups: comp.sys.ibm.pc.games.action (More info?)

I've seen references in the online guides for the PS2 version that
mention being able to do a tactical reload by pressing a button, but I
can't find any mention of it in the manual or in the game's key
mapping screen. There are situations in the game where having a full
mag is really necessary, but having fire off the rest of the current
mag is waste of ammo and attracts too much attention.

Is there a reload function, and if so, how do I use it?
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MCheu