If you encounter a Carno, you can go into some sorts of deep water like a deep river or ocean because they are not good swimmers. If you are prepared to tame one I would recommend kibble and Trang darts out of a longneck rifle. They are fast so a trap such as on with doorways and a ramp. Another idea is sacrificing dinosaurs like Parasaurs and small dinosaurs then shoot it while it is distracted with the other dinosaurs.