JB wrote and article awhile back and included was a pic of an Elk broadside at what looked like relatively close.
The caption-and it's been awhile, so correct me if I'm wrong, if you're reading JB-stated that many try to be absolutely exact in that situation. They fool around trying to hit the aorta dead center, when they should just be sticking one in the heart lung area right now. Of course you may have a dead Elk, but you may not have a campfire pic of a blown up heart and subsequently feel that you didn't do all that great.
Also the more you shoot the more you are not hesitant to shoot. The more you shoot the more pictures you have to call back on that gives confidence.