Placeing the mags bottoms up (brass to the grass) with the bullets facing to the rear is the method I prefer. I grasp the magazine so that my knuckles are away from my body. This allows you to grab the mag the same way regardless of position (7 or 11 o'clock). You don't really want to change/adjust your grip on the mag in order to insert it into the mag well. Grab it like a beer can and slam it home, give a slight tug to ensure its seated and carry on.