Worked it out yet ?
Shoot one, get one free, anyone managed it with an air rifle, I just done it, had a hedge full of woodies at 40yds from me, sat watching for ten minutes or so, eventually I had two lined up, head shots perfectly, hit the first, straight through, and through the upper neck of the second, one shot, two woodies, both stone dead, think that's a first for me with an air rifle.