shooting at rrunning animals is the mark of the slob hunter, if it's more than 25 yds across your front, or more than about 75 yds mostly straight away from you. In other words, if you have to aim at hair, not air, it is a serious breech of ethics. No way in hell you can adequately gauge the lead and you will cripple a lot of animals, sooner or later, for no reason other than you are too inept/lazy do get a decent shot. You can't tell if he's running 30-35-or 40 mph, which is 45-50-60 fps. At say, 100 yds, the bullet takes at least .10 sec to get there, so the critter runs 6 feet after you shoot, with the bullet in the air. What does 6 ft look like out there, while watching a running deer? While focused on the moving animal, are you also watching your background for safety, no you are not, mr Cheney! The deer will be dodging around real and perceived (by him)obstacles, making even a perfect shot a mere wounding hit. He is also bouncing up and down several times per second, so you can easiily shoot off his lower jaw or break a leg and he can run many, many miles with that broken leg. Don't do it, and for sure, don't brag about having done it, especially on Net forums where anti-hunters and anti-guns can use such stupidity against us!