May I suggest you purchase an inexpensive "fox" call. My favorite is a small wooden call that imitates the cry of a small mammal who is being eaten alive. Not too loud, but able to be loud if needed. When ground hogging, with no chucks in sight, start with a little mewing, ewwww ewwww very softly and sit and wait. No chucks, no fox, no coyotes, then a little louder. Won't be long before you have a nice critter in your cross hairs and let that .22 bark.
just my opinion.
fred