Antelope by far if you are not decoying or sitting at a water hole. All animals have there weeknesses though. Elk can be hard during the late season however it is very common to get shots at 10 yards during the rut. Mule deer in the rut can be slapped in the face if there are no does around. White tails will just about poke there nose into a bottle of doe urine. The key is knowing where the animals are and timimg it to your advantage.