I'd rather a deer be stopped but I have taken several deer at 20 yards or less while they were at a "very" slow walk. I've taken one nice buck while he was running and he was at 5 yards chasing a doe. I led him right and dropped him is his tracks, not 10 yards from the base of the tree I was in. I want to stress I would have never taken that shot under any other circumstances! Again, I would much rather a deer be stopped.