In general a Nosler BT and most other conventional expanding bullets for that matter actually penetrate better at the lower end of the velocity spectrum than they to do the higher. I know that inverse relationship sounds wrong, but the expanding bullets when shot at higher velocitieswill generate a larger, shallower cavityinstead of deeper penetrating wound cavity. The KE is released much quicker at higher velocities and this actually reduces penetration.

Solid non expandingbullets willalmost alwayspentrate further at higher velocities, as most hunter would haveexpected of all bullets.