Places to hunt prairie dogs?

Most of my shots are 100-300 yards out.

I've just started shooting close, roughly 20-40 yds. for squirrel here in the last 5 months with a guy I'd met on YouTube.

The longest shot for me is a dove at 280yds. out but never hunt those dogs, can't wait, maybe guys want to car pull to some of these places.

What ever guide said he did not want to book any more air guns, he doesn't know what he is talking about or ever shot an upper end air gun.

We don't know each other but we have one thing in common, PCP.
 
Honestly, with my experience with PDs in Utah and Wyoming in the past I would say that you are doing to find slim pickens for PDs this time of year.

The PDs for most of the northern regions should start to bed down for the winter, so don't expect much action in KS and similar until the spring. Maybe try for now rabbits, starlings and etc, different targets but you can take some long shots still, if that is what you want. Recently, someone asked me about rock chucks here in Idaho and I said they are down for the winter doing what they do, and so don't expect them back up with out rare exception until March 2022 I would say as a general rule, ground / burrowing rodents tend to be season (normally) from above to below ground stand point.
 
You can hunt prairie dogs with a sling shot if you wish. My experience is there is almost always wind to contend with and most of the shots are 200 yards and out. You’ll get some close ones pop up from time to time if you are willing to sit and wait. If you can hit a soda can in the wind at 200 yards you probably will be able to get a few. Or if you are lucky to find a town that’s never been shot in and a calm day. Unlikely. Typical conditions expect to be frustrated . Some people walk hunt them making close shots. That could work but I personally don’t like hunting that way . Most of the walk hunters use 17 HMR . 
 
I've hunted them in AZ, typically people don't give up hunting spots. Finding a good area that has an abundance isn't always easy, especially on public land. Some Indian reservations will charge for access, this could be an option. Sometimes you just need to fill up the gas tank, put on some boots and do the footwork to find spots. The Prairie Dogs from my experience are most active in morning and early evening, especially on hot days.