9.3 x 57, I don't know what you are up to with this, but Barnes has fed you a line of bullcrap.

So if you are unsure, may I suggest that you take a vintage double rifle and fire 200 Barnes solids through it, and observe the result?

Also, someone commented above that until 2007 Barnes solids were not of driving band design. AND they are still NOT. They are grooved, because Barnes does not wish to invest the machine time necessary to produce a genuine driving band bullet which would not damage double rifles.