Well never hunted elk (I did but never got a shot off) but LOVE the 168gr TTSX on deer. One thing to keep in mind is the Barnes offerings will equal penetration of much heavier bullets. The reason is when a bullet, like even the accubond, starts expanding, it loses lead/weight, and the Barnes will retain about 98% of it's weight. A typical 180gr bullet will end up at 150 or even less. The Accubond would be prob closer to 150, but a core lokt or similar would most likely be less.
My suggestion would be first and foremost, use the most accurate round of the 4, but of choice, it would be the Partition first, mainly due to reputation, and the fact that a 165gr is about ideal in the 308.
A gun shop owner I know has used the TSX on elk, and shot a cow elk at 200yds with the 165gr. He shot it broadside in the shoulder, and he never recovered the bullet. Broke both shoulders and exited. I'd say keep the shots with a 308 at 300 or under, personally.
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