I've shot probably 2k or more of cci quiets. Velocity can be hit or miss.
I recently started chronoing them to see if that would account for my occasional misses. I did about 75 of them for laughs on day. Lowest was 635, highest was 740. Most seem to cluster around 710. I had grand ambitions to chart all of it and run a big test, but alas, here we are with my memory.
Sadly I can't suppress them, as I'm in Canada, but they are quiet enough that I don't disturb the neighbors about 175m away.
I normally shoot them @ about 100 yards. Wind screws them up, especially with the velocity swings. I have a 10" w/ 2" "heart attack" plate that's fun enough to ring when I'm bored, and can normally go 8/10 out of a mag on the 2" center if i'm concentrating.
Come up is about 6.6-6.7 Mils on my nightforce w/ a 25 yard zero.
I've shot a few grouse with them, and not overly recommended. They worked, but it wasn't a perfect lights out.
They are plenty fun for plunking around, I probably will keep shooting them just for laughs, as I enjoy lobbing the damn things down range. After November passes, and the snow beats some grass down, I plan to stretch them out to 200 if I can get that much come up with my NF.