He doesn't install any of them, it is my understanding from talking to Leupold and others, that they do it themselves. Leupold told me that if I want to design a reticle, they will manufacture it and install it for me too (for about $10,000 initial fee).
A few years ago I wanted a reticle that let me shoot out to 1000 yds. After serious discussions with a couple of engineers at both Leupold and Swarovski, I felt that it was the consensus feeling in the industry that much over 500-600 yds required too much input to rely on the coarse adjustments available simply by a reticle. I have never seen a 1000 yd competition shooter (that is competitive) yet that didn't have turrets and use them!
Maybe I am just too old fashioned but I would have to "see" to believe.
