Having been a competitive shooter for years I have seen those trails with my rifles. Cold crisp morning shoots are the best for seeing them. And as anyone who has ever shot the 45 acp knows you can actually see the bullet traveling down range. Last time that I had checked the world record for a 1000yard shoot was 5 shots in a 3/4 inch group with a 300 Winchester magnum. ( my best was 3 inches). These guys that do these long kill shots use large heavy projectiles that carry a lot of energy down range. Being such even with a muzzle break the initial recoil is tremendous. Being able to control all aspects of your body including your heartbeat ( yes it shows up down range ) to steady the rifle and knowing you are going to get the shit knocked out of you when you squeeze the trigger takes a lot of self control. It is always funny when I would let some one try one of my long range competive pistols. First shot dead center almost every time, the rest all over the place since they are afraid of the blast and recoil.