Ive ran into the issue of purchased lead bullets to all be hard, very hard. This brings up one of the nuances of lead bullets, expansion. Being we try to push our lead bullets to greater velocities than perhaps they should be, we must alloy those bullets, this means making them harder usually. Well the issue comes up that a certain lead hardness needs to be driven at a certain speed to see expansion. The lead bullet manufacturer doesnt know how fast you will drive the bullet so they cant tailor the hardness to your use. So, they go the other direction, harder. Harder bullets work to, with the right profile a hard bullet with crush through flesh and bone delivering devastating hydrostatic shock. Additionally they will go in a straight line even when encountering tougher flesh like sinue, cartilage and even bone, this means we can reliably hit vitals. That, again brings up my final point, penetration. A hard bullet will carry deep, really deep into an animal, Im sure you can imagine the usefulness of this feature.
So, will a hardcast be useful in a perfect side on shot? Well, thats for you to decide, but that tough quartering shot might be taken a little easier given the knowledge above.