I would be interested in the 129 LRX performance on deer and elk. I set my buddy's 270 up with the 129 LRX and told him to go shoot anything. I'd think it would be close to perfect from antelope to elk - but I'm pontificating.
I've only slayed a handful of whitetails with that bullet so can't speak to the larger stuff, but there isn't much walking in North America that I'd fret using that bullet.