Just going from memory, he shot a 300 WSM, Krieger barrel, Borden action, LRB stock. Thats an unbelievable target!
While not hunting, all of our custom parts we use and most all our knowledge of tuning and building really accurate rifles comes from BR. I have learned most of what I know about building accurate rifles and tuning from my involvement in LR BR. Those really accurate platforms are necessary to see the details. You learn it there, then you apply it to the rest of the rifles. It really goes hand in hand with LR hunting.