Never took an elk with them, bit I used 180's in a .308 for a while. Bought some loaded ammo for the brass (Norma brass is $2/per in Canada and I found loaded ammo for $1.50ea). Performed admirably on a couple of deer and a moose. Much like a Hornaday Interbond - fast expansion, big frontal diameter, holds together really well.
Great choice if you're planning on keeping it inside 300, but I'm betting it starts to drop off pretty fast after that due to the low BC.