I would consider all cast lead bullets to be expanding. Consider this, it if the bullet hits bone, tissue, it will upset.
If I were in charge of Game and Hunting Departments I would consider the ban on "no expanding" as a way to prevent hunters from using AP, FMJ, or tracers!. These bullet don’t expand, and if they hit trees, rocks, they will retain enough structural integrity to ricochet. I have shot through trees with 8 X 57 mm military ammunition, probably AP, and a bud of mine had the experience of 7.62 X 39 mm ball (or AP) actually slapping through a wooded area, and hitting someone he knew, about 1 mile away on the right. The bullet was spent, and the people down range knew who was firing. Even a hard cast bullet is likely not to act this way.