I'd personally go the 17hmr route for groundhogs. It shoots flatter and will be devastating on groundhogs at 150 yards with good shot placement, and will almost certainly be more accurate.
And I love my 883 Marlin in .22 mag, but I had to shoot around 15 different types of ammo to find 3 that it liked. The ones it didn't like, particularly anything in 30 gr, it scattered. 2" groups at 50 yards, sometimes larger. I've got a buddy who shot his cz 452 with me while we did this, his was also picky, although slightly less so, and preferred 30 gr projectiles. Still, both of ours were 1-1.5MOA guns with ammo they liked. Another buddy has a savage 93 in .17hmr, and his seems to shoot just about everything 0.5 MOA.