I agree with the unpredictability of the meplat as it makes contact with heavy bone. All the more reason for water quenching and using alloys that will be tough but not brittle. The Garret formula of alloy used for the Garret, and now owned by Ashley Emerson, Hammerhead design is ultra reliable.
So discounting cast bullets as unreliable offhand is not fair or just. In my honest opinion of never say never...