It's a nikon pro staff bdc. I'm gonna call it cow fever. First time it's ever struck me.
Practice your offhand shooting and see what kind of groups you shoot at that range ("130 yards"). Then consider a little adrenaline, heavy breathing and maybe some muscle fatigue and the groups open even more. Try practicing with different rifles too, you might be surprised at the difference in group size from one rifle to another. Hopefully you didn't wound any of the cows you were shooting at and better luck next time..
