All my shooting buddies change chokes to fit what they perceive as the ideal situation, and most shoot O/Us so that they can have an open choke for a close target and a tighter one for further away birds. And, as Larry said, sporting clay competitors are the ones who do so the most. I have found that, even though most of the top shooters in the genre can change chokes, there are some at the pinnacle of the game who rarely do. I used to, but found it distracting (which probably says something about my limited mental capacity) and have done the best shooting of my life since I began shooting a fixed choke Perazzi with two .020" chokes. I had them opened to that from F & F.
That is not an indictment of choke changing in general, it's just not conducive to my best shooting at this time.
SRH
