Hard cast bullets are considered expanding bullets.
If you don't believe it shoot one into a dirt pile.
At 44 magnum velocities you will have to dig 10" to 13" deep to retrieve it.
I know this wasn't your question, so hope you don't mind, but I'll say I shot a deer last year with one and I think it was overkill. I think a hot hollow point like an XTP would have been more disruptive internally and quicker. I was in a big field which he never left and watched him run off after, and he didnt seem to know what hit him. It was a double lung shot. Out of my 10mm. Again, for what its worth.
Ive hunted with nothing but Cast bullets for 30 years or so, never failed I use them in 357 mag, 41 mag, 44 mag, 45 Colt, and 44 Spec My only other bullet is the Barnes XPB