Well said Lonestar, I worked at Nosler as a tooling engineer for 6 years. used Partitions in everything, except handguns. Just as you said, the lower velocity with Ballistic Tips works perfectly at handgun velocities and they do indeed perform "like "harder" bullets".
The lower design limit of expansion on the Ballistic Tip bullets is 1600 fps impact velocity. Keep the velocity above that and the bullet noses should expand to at least one diameter in soft tissue.
Heck, just load em up and go kill something, they will work just fine, within reason of course.
Joe