Palladium should texture fine in a rolling mill, it is not much
harder than silver. Some white gold alloys are OK, it depends a lot
on nickel content and the older white gold alloys used silver
Pure palladium is as you say not much harder than sterling silver
but the new 950 palladium alloys are. They come in at about 250
Vickers when fully hard and 175 when annealed. That is in the same
range as some of the nickel white golds.
James Binnion Metal Arts