....but the harder alloys won't deform much. I still have the .457 425 grain slug I took out of an impala I shot at 50 yards. You could pretty much load it up and shoot it again, it just didn't deform. Those were Hunter's Supply bullets, and a harder allow than the hand-cast soft lead bullets we have started using.
The hard cast bullets can be very accurate, but for game taking, I like soft lead.
In smaller bores, you need to get the velocity up there before much deformation will occur....that, or hit a bone in the animal you shot.