...and PC is harder than the barrel, so it won't leave invisible deposits?
You are correct, it's no more a problem than any FMJ, HiTek, or PC bullet is.
Federal has had a plated 5.56 bullet out for years. Full velocity too.
Alkaline plating solutions are "typical"...and infinitely reusable. Buy once, use forever. They're also reasonably priced, you just have to know where to look.
I size my bullets to make sure they're concentric, the same as you and everybody else does I imagine (Y)
[edit]- To be clear, alkaline solutions are very tricky to make on your own. Basically impossible unless you have a really nice lab. Acid solutions are easily made at home, so in that sense one could argue alkaline isn't "typical"...but given you can readily buy it by the gallon online and it lasts forever, I call it "typical".