captdavid,
Yeah, you're right. Many hunters misunderstand Partitions. Many make the comment that they're too "tough" for deer-sized game, or assume because the exit hole can be pretty small, a Partition didn't expand--which as I've noted before, makes me wonder how many hunters axctually field-dress their own game.
The front core of Partitions consists of 2.5% antimony lead alloy, softer than any of the cup-and-core big game bullets I know of. The rear core alloy contains considerably more antimony. If I recall correctly, in most models it's 5%, but can vary slightly depending on the specific bullet, not only due to the game it might be used on, but accuracy. Some bullets shoot better with a slightly harder or softer rear core.
The jacket conformation can also vary, both over the rear core and front core, depending on the usual use of the bullet.