Happened upon a willow on an old unused road so I pulled out the BPS 20ga and unloaded a round at about 25 yds. For some reason, the pattern didn't do it's job and off the grouse went...

Straight up 200'! You could have hung a plumb bob off it's rear end and not got an inch off center. After which, it glided off out of sight. I'm sure someone could argue that it's impossible for an upland bird to pull that off but it did.