I would look into what Bighorn said.. Somewhere I have an article on a serious coues deer hunter in Az. He used a .300 Wea. of course a custom.. The .243 never impressed me as a long range anything, except maybe gongs.. Plus shot several antelope with the .257 Wea. at about 400 yards.. They made some long runs.. If it would have been in brush, finding the animal would have been tough..
