Yep. Unlike Speer Hot-Cors, which have molten lead of a relatively hard alloy injected inside their jackets, the boattails are formed by swaging the jacket around a relatively soft-alloy core. This often does result in finer accuracy, but they don't penetrate as reliably as Hor-Cors, especially on bone--which is why they tend to work more consistently when started at moderate muzzle velocities, especially at closer ranges.
