I have a Leupold VX-2 3-9x 40 CDS on my Tikka, but only because the scope was handy. Shoots fantastic.
Exact same scope I have on my 17HMR and for the same reason.
3x9 is more than enough scope for the 17 HMR which I consider an effective 150 - 175 yard cartridge for ground squirrels.
At 150 yds = 87 ft lbs energy and 175 yds = 73 ft lbs energy. It is just not enough cartridge to insure clean kills at ranges beyond that, even ground squirrels and PD's shouldn't have to suffer a painful lingering death.
drover