I can be sitting in my blind, shivering my azz off uncontrolably. As soon as a deer comes out.....calm as can be. Just as if the shiver switch was turn off. I forget that I'm cold. But, as soon as I raise my rifle or ML, the heart rate increases along with the shakes. Doesn't matter if it's a doe, yearling, or buck. I do some breathing exercises, calm my heart rate and breathing and .........squeeze. Bang. Happens to me every year for almost 20 years. You'd think after all these years and 5 to 10 deer a year I'd be over it.