I can't comment on what you need to kill an elk, but I can comment about the Mauser M18.
Earlier this year my partner got her firearms license and we went into a local shop to get her a rifle. Her primary concern was that someone was light enough. She felt the Tikka T3 and the Kimber Hunter, but didn't like either of them as much as she hoped she would. Out of left field, the shop owner handed her a Mauser M18. While not as light as the other options, she loved the way it felt. The bolt throw in particular is really interesting and she liked that it took much less effort to lift the bolt than the other rifles.
This year, she's killed a couple of wild pigs with it, and several fallow deer. I've also killed a heap of stuff with it. It's been 100% reliable, and because it's not particularly expensive or pretty, it gets abused pretty hard and it never skips a beat.
For people considering rifles at that price point, I always strongly suggest they check a Mauser M18 out.