I reload weak hand for a few reasons. I learned from the beginning that way, I feel it keeps the muzzle pointed in the correct direction, your strong hand stays in the correct grip to get back to shooting as soon as possible. As far as where the reload takes place, up high or down low seems to make no difference to me as either way you need to reach for your belt to get the new rounds and get them into the gun and then the gun needs to be brought back up to shooting position. Kind of a six-of-one, half-a-dozen of the other situation. Personally I believe that up high the gun stays pointed towards your next target and less time is lost with regaining your sight picture. But that's just me.
