At this time I have found that speed 223 works great for the Assault Rifle in Halo Reach. For those of you that want to change your mode 1 to this, reset the speed on mode 1 to factory settings (if you havn’t changed it don’t worry). Then go into edit mode on mode 1 and click the right bumper 14 times. The speed readout should be, two blinks, pause, two blinks, pause, and then three blinks.

Let me know if you find any better speeds for this game!