IMHO it is not just a matter of old versus new, it is a matter of barrel thickness as much as metal strength. At the end of the day, I don't believe that at NE speeds, monometals are really needed when perfectly good FMJ solids are available. At faster speeds I can see the point, but most often this implies bolt rifles with thicker barrels anyway.
At the price of a new H&H or WR, I don't think many will try the new versus old theory either!