For elk and that cartridge, I'd shoot the 200g Accubond.
I've seen my brother put four 180 AB's into elk. 2 at 428 into the ribs of a cow--neither exited. 2 at 200 into a raghorn bull into the lungs--neither exited. I didn't feel that there was a tremendous amount of damage internally in either case and no exit hole--not that I believe you need and exit hole, but if it doesn't exit, my theory is it had better do some serious damage inside to stop 'em.
By comparison, my 300RUM shot the 200g A-frame at 250yd and took out a 6" diameter chunk of the spine on one cow and 2 other shots with 240g SMK at 450 both exited and 1 other shot at a spike bull at 60 with the 240 broke a shoulder going in and literally jellied internal organs in front of the diaphram.
My take away from what limited experience I have is that the 180 AB in the 300 WSM
is adequate, but I think it may be a little underpowered for elk, especially at any distance. Elk are big, tough animals and I think we owe it to hunting in general to 'use enough gun' as the saying goes. Not to say that a well place shot won't work--it will. Just had some expereince that makes me wonder is all about the 180 AB in the WSM in elk. This is one reason I went to a .338 this year in the off chance of a bad hit, there's potentially a better chance of ending things quicker. Just my opinion and ramblings.
I think the 200g AB would be about as good an all around choice as you have in that chambering.
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