Fitting in to a suit probably had something to do with...
I've seen GD shoot a number of times at Southdown gun club in the summer, (really nice bloke) you can't take it away from the guy, he's a great shot, BUT I have seen many of his videos, he's hitting and killing birds at some fair old distance, but I think you'll find it's down to some clever zooming in and out to give it the appearance it's a distance away, and then a chap with an overly expressing and convincing voice says "he's even dropping them at 90 yards" the mind beleves
Just my opinion
Sam