In my testing I wasn’t getting any expansion at Special velocities.
Some may have different experiences than me, but with the exception of Federal HST wadcutters, which they don't make in .44 caliber, I have not found anything that reliably expands at less than 900 FPS. They may exist, but not to my knowledge. That is, with reliable expansion. My rule of thumb is every pistol cartridge less than 900 FPS, I am wanting a SWC or flat nose style bullet, if it will feed reliably. Having said that, Lehigh has some interesting designs that don't expand, but are supposed to be quite destructive (so they claim). I have not seen any independent reports on them.
