My 6.8's sport 4-12x40 and 2.5-16x50mm.
It might have a bit more drop, but the 6.8 carries a lot more punch between 300-600yrds than a 223rem (twice the energy, twice the momentum, and 3x the TKO factor at 600), so I built mine with longer range work in mind. As such, I put appropriate scopes on top.