Seems like for distances <300 yds they'd go with 16" AR's. We had a blast in WY shooting prairie dogs with them. Two guys with AR's vs two with bolt guns was funny.
Great shooting my huntin partner shot 11 in one shot 3 years ago a 312 yards, YES 1 Shot he shot a female that had 10 pups ready to birth in a few days and in her. Yep we lost that day, cost me a steak dinner but it was well worth it, and glad to do it.