That's interesting. Assuming an average velocity of mach 5 firing a SCRAMjet for 600 seconds would equate to over 600 miles of range. Assuming an average velocity of mach 7 you could get up to 900 miles of range. Of course, much depends on the actual thrust of the engine and whatever payload is strapped to it, so these are just ideal estimates, and it's unlikely they're anywhere close to turning a scramjet into a weapon, but if they can get even a fraction of that range and combine it with a first stage booster (which presumably would also accelerate this missile into a speed regime where the SCRAMjet could initiate burn), they might have quite a deadly missile on their hands.