I'm not here to tell you the heart doesn't race a bit at times, but you have to become the predator to control it. Even a cat waiting to pounce is strung pretty tight sometimes. You can see every muscle just tensing and ready to leap, but they're still the consumate predator through it all. Steady focus and one purpose in mind, to triumph. I do have a tendancy to get more excited after the shot. I guess it's coming down from the high of concentration. I always tell myself, "Ok, you did that right, now sit down and breath". And then I do it.