my understanding is that in the Gold Partitions, the partition is further forward in the shank of the bullet, which retains higher weight after impact. There is a steel cup in the base, which resists deformation.
I bought a couple thousand of the 150 grn .308 when Midway had them on close out. I've killed a pile of deer, elk, antelope, and one dall sheep with them out of .308 win and 30-06.
I'm down to just a few hundred remaining.
Never recovered a single one out of an animal.