I never liked the 'trigger finger' method, as it always made my 2nd finger joint hurt after doing it, so I use my middle finger. Whether static or dynamic, I've never spaghetti'd the gun into the deck by 'flipping' the gun up, using the web of my thumb and pointer finger as the contact spot for rotation, before dropping the mag with my dominant middle finger, 'flipping' the gun into a good grip, and getting another mag in. This method may be too slow, however, as with frequent practice, it seem's like my mag arm slows a bit to make up with the extra-time taken to eject the mag.