Double fire

There is a way to fire two consecutive bursts from your BR55 Battle Rifle in Halo 2.

How to
Double Fire: R,R,X

Quickly press R, then as soon as you have your R released again, quickly squeeze it again and this time hold, quickly after the controller has registered the start of the holding press X in order two have the two shots burst out at the same time or rapidly following each other. Timing is crucial, there is about 1/10th of a second to do so and within that second pace of the shots is also determined. You will know it's successful when you see no reloading animation, but have a full clip again with 6 bullets less. You can also cancel the actual reloading by the Cancel Reload, but more useful is to Double fire and then instantly throw a grenade to cancel the reloading, this also seems to be the quickest way to get damage across a map.

This glitch does not work on Halo 3.