The .17 WSM I owned for a while had a 22" barrel, and all the 20-grain factory ammo tried got around 2950 fps. My CZ .17 HMR also has a 22" barrel and, depending on the batch of A17 ammo and the temperature, velocities run from around 2825-2900 fps.
My .17 WSM was jackrabbit/coyote accurate but not consistently prairie dog accurate, so I didn't shoot it all that much on PD's. From what I did see, there wasn't all that much difference between the A17 HMR ammo and the .17 WSM. At least not enough for me to keep that particular .17 WSM.
