17 HM2! Can't shoot quite as far as a 17HMR, but still good out to about 150 yds.
It is NOT a dying caliber, ammo is readily available, and is half the price (give or take) of HMR.
My little 10-17 almost has the same POI at 100yds as it does at 50yds, and man is it fun fixing gophers with this little round! Last time we went out, after about an hour, it was so hard to keep on target.... we were laughing so hard we could hit anything any more! It sure does a good job of putting them down though, and on some occasions it explodes them quite nicely!
Just my opinion tho...