From looking at them the TBBC bullets are kind of "sloppy" from an aerodynamic POV as compared to, say, a 62gr Fusion or 64gr Gold Dot. The TBBC has the lead kind of "splat" in there; the Gold Dot and Fusion are more "trimmed" and streamlined for flight. Of course that big-ass soft-point on the TBBC is probably why it has it's reputation for terminal ballistics.