In my CZ rifle 10.0 grains got just over 3700 from its 22" barrel, and I was also using 7-1/2's. The primer can make a considerable difference in pressures in such a small case. (A friend reported 10.0 grains as obviously too hot in his rifle, but I dunno what primer he used.)
In my rifle A1680 and H4198 turned out to be the two best powders with 20's. A1680 matches the factory velocity with fine accuracy, but gets a little squirrely on a hot day from a hot barrel. H4198 is about 100 fps slower but just as accurate, and more stable on warm days.
