I don't recall when my club started stocking Gun Clubs, must have been about 15 years ago. But we stocked Gun Club, AA, and Federals. I had shot the Federals up to that point because I'm a cheapskate and they were $1 cheaper a box than the AA. Then the Gun Clubs were the same price as the Federals so I tried them. They seemed to me to have a bit more speed, and I shot better with them. So I continued with them, and won Top Gun at our club two of the next three years before I moved, had kids, and stopped shooting league regularly.
I like Gun Clubs though.