I don't really get the BT flies way flatter than the Partition argument. Most game is taken at well under 300 yards, and I am willing to bet that the vast majority of hunters would have a very hard time making consistant, lethal hits at 400 yards.

The ubiquitous .30-06 with 180gr at 2750fps does the following:

Ballistic Tip - +/- 3" PBR is 275 yards with -5.5" at 300 and -19.5" at 400 yards.
Partition PBR is 274 yards with -5.6" at 300 and -20" at 400 yards.

For all intents and purposes, that is identical performance to past the range that most people are capable of acceptable marksmanship.