Varmint hunter has a club for extreme range confirmed hits on PD's, chucks and the like. No mention of how many rds are taken to get there.
I followed an article in Precision Shooter by a couple of guys wanting to hit gophers at a mile and further. They are now successful and are heading to 2000yds and further. They were using 300WM's at that time.
No matter what you use, that is ALOT of elevation needed. 100min would be the absolute minimum for this type of plinking.
I might upset some but this is more directed fire then a called hit. As many know and have seen, I do alot of LR shooting. When distances tickle 1 mile, target size starts to approach MOA for anything resembling aimed fire.
A prairie dog is about the size of a pop can. Even if the rifles used were capable of shooting 0.100MOA, at 1 mile (1760yds) that is a 17.6" group (actually closer to 18" for true MOA).
Really doesn't matter only to show that the mechanical accuracy of the rifle under zero atmospheric conditions is 3 to 6 times (depending on how that rat is looking at you) bigger then the target.
Add in just a smidge of anything, and calling a hit that far away on a target that small is essentially a joke.
I know from their reports, they were shooting hundreds of rds over many many trips to make that hit. They would stop as soon as the sun came up or any wind started to blow.
Lobbing lead way out there is an absolute hoot and hitting a "reasonably" sized target a great kick in the pants, but don't say hitting a PD at these ranges is anything more then a hail mary.
Rohan, US Army tests of the then new 45-70 showed that it was lethal at over 1 mile. Lead slugs were still busting through pine boards into the beach where they were doing the tests.
Jerry