Eric, when you say "best", I say it depends.. Bullet like the 200 AB and ET are game changers, along with the awesome 210 PT. All three of them can easily be moved into the 3000 FPS range and will absolutely be smashing on elk or moose. Check out the bullet test area, those bullets are awesome performers in the 338. I was pushed on more than one occasion to try the 210 PT. I always sorta thought the 338 was better with the 250's. Well, after doing load work with the 210 then smashing an elk with one, I would say it's THE bullet that could do pretty much anything on soft skinned North American game in the 338. The 200 ET may be better, but I am not sure how, as the 210 penetrates really far and expands really nice.
On the other side of the coin, I really like shooting the heavier bullets as well (250-275's). Those ones can be moved 2750 (250) and 2600 (275) without much drama and would handle the really heavy game such as Grizzly's while still providing really useful trajectory out to 400..
That's the dilemma with the 338, it acts like a 300 mag on the lighter side and a 375 on the heavier side. You gotta love that sort of versatility.
