Simplyme: My various 222's are scoped with the following scopes:
#1 Remington 700 Classic = Weaver 4x16 (V-16)
#2 Remington 700 Classic = Lyman straight 10 power
#3 Remington 40X-BR = Leupold 24 power
#4 Remington 700 Varmint = Redfield 6x18
#5 Sako L-46 Varmint = Leupold 8 power Westerner
#6 Remington 722 = Lyman 10 power Perma-Center
The Berger 40 grain bullets are extremely accurate (paper fun!) and they are VERY explosive on smaller Varmints like Ground Squirrels and Prairie Dogs.
If I were to find another heavy barrel 222 Remington (and I am always looking for same!) and "I" wanted to shoot Ground Squirrels and targets then my first choice for a scope on it would be a Leupold 6.5x20 variable with the fine Du-Plex reticle.
Best of luck to you with whichever scope you choose.
Hold into the wind
VarmintGuy