I am hoping it doesn't come to it...and for now wont go into details cause I am hoping Leupold can fix the problem... but...

There may be the chance I will be taking my 270 WSM on my Northern BC moose/caribou adventure. This is a very accurate gun that can shoot long, but thats not going to likely be needed on this hunt. Max 400 yards and expect to be even closer on my shots like 2-300. Knowing this, I am wanting to hedge my bets with a super stout heavy bullet and wanted to get your thoughts.

Assuming BC and long range is not a concern, and assuming all of these bullets shoot well - which would you pick. BTW, I will be pushing these all in the 3100-3150 FPS range.

150 grain Nosler Partition - leaning this way
150 grain Swift A Frame - no experience with them
150 Barnes TSX - Not sure if I can push these as fast as the others