Never had a .243 Win and may never, although I've shot a couple. Makes a pretty good deer cartridge but I live in elk country and usually hunt both at the same time.
Over the years I have seen more game wounded, mostly elk, with a .243 Win than most and probably all other cartridges combined. Hence my opinion that when it comes to elk .243's are for experts and idiots. I am particularly disenchanted with the round when well-meaning parents give it to kids for elk hunts, as happens far too often.