Why not cast for deer? Make them sufficiently soft and they should work as well as cast does in a .30-30 or .303 Savage which I have proven to my satisfaction quite often. Something in the way of a FN bullet weighing between 165 and 190 grains can be moved at the same speed as a factory jacketed bullet. (I routinely load my .30-30's with a 190 grain FN cast relatively soft, 10-12bhn, at exactly 2000 fps out of a 24" barrel - squarely in factory energy territory, and with excellent accuracy and zero leading.)
I know I have several hundred cast for the 32. Most are cast from wheel weights. But I've bought from professional casters as well. When you say soft; what is the alloy you are using? I have a good supply of tin and plumber's lead, but I have mostly wheel weights. I thought I had bought a Lee hardness tester, but I'm not sure where it is.
So far, I've not tried cast for deer on that small of caliber. I guess I should get out a box of old American Rifleman magazines and see how they expand in those magazines.
