That picture reminds me of hunting with my friend in NE PA many years ago. He would shoot 20+ chucks in a day with his 22-250 Rem single shot heavy barrel. It was Remington's special varmint rifle (can't remember the model) probably 30+ years ago when he bought it.
Back in the 80's and 90's I did a lot of rock chuck work. Still have a few ranches that have monster problems with them. I don't have much against them anymore so I rarely bother them.
When we did we only used our elk rifles (6/06 on up), and no heavy barrels. Out to 300 it was offhand or sitting, from 300 on out we would set up on the ground generally over a day pack and or a bipod. We shot a lot of them between 300 and 700. My biggest summer was 458 of them.
It was darn good practice when done this way and come elk season those darn bulls seemed awfully easy after a summer of this kind of practice. Reading the angle, wind, mirrage etc wasn't ,all that tough.
Good days