A search for these topics didn't bring up much. I see a lot of threads about tweaking equipment, but what can a shooter do to improve his or her score?

I'm getting back into long range shooting after a long hiatus, but in the Marines we worked on lowering our heart rate, and controlled breathing. When I did those two things, my shooting improved.

I'd be interested in hearing how people use those, and other techniques, to improve their scores.