I'd lean towards the partition myself. There's a ton of guides and outfitters that cite the .270 as their recommended minimum for elk and moose. Smaller rounds can easily kill them but the 270 is a sensible minimum in that it really does have the horsepower to smash a shoulder and take out vitals with broad sounding. Shot placement is everything but that being said there are shots you can take with a more powerful gun that you shouldn't with a smaller one, as in the allowance for acceptable shot placement is in fact more forgiving with more powerful rifles. There are shots I'd take with my own .300 win mag that I wouldn't take with a .270, and there are shots I'd take with my .270 that I would hesitate to make with my .243. The .270 is forgiving enough to make most shots on elk with an appropriate projectile for the job.
I'd feel better about it with a 150 grain partition, 140 trophy bonded tip, or 130 mono of some kind but that's just me, there's nothing wrong with 130s just not the sst in my opinion.