actually some of those pictures are likely to have been from shots with those smaller caliber rifles
22-250, 223, 243, 220swift 22 hornet
a friend of mine prairie dog hunts a few times a year and he uses a 220 swift for the msot part and many of his pictures that i see the dog is cut in half
never underestimate what those small caliber rounds are capable of as they have muzzle velocities of 4K FPS or more
i believe my buddy loads them up to shoot around 3400-3700 fps so save on the barrel life