33 nosler or 338 rum

Hi guys,
I've been thinking about building another rifle. It would be built on a r700 action. I would like to build something in a .338 caliber that would fit in a factory long action (<3.700 coal).

Currently I'm thinking about the 33 nosler (expensive brass!) or 338 rum (hard to find brass/more recoil than I need).
It would be used for elk no further than 800yds. I also shoot my rifles for fun/practice out to 1,000yds. I would like to shoot the 285eldm out of a 26-28" barrel at around 2,850fps.

What do you guys think?
338 Lapua. 300gr SMK's @2730, McMillan rifle
 
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