you never go wrong with a Partition for Elk but in my experience and lots of testing for Penetration vs expansion comparing elk bullets. The Accubond is the clear cut winner for expansion and weight retention.
The Partition will always explode quick and then drive the base deep. The Accubond always expands within a few inches(getting into the vitals) but holds more weight with the lead bonded to the jacket driving deep as the Partition but expanding where you need it; not premature like the partition can do sometimes when going through a big shoulder.
Dont get me wrong, most bullets will kill elk if you put them in the right spot however lots of mixed results with other bullets. In a 8x57 go with the 200Accubond and sleep well knowing you have the best option regardless of the shot angle that is presented!
Happy Hunting
James
