They actual did it. Koenigsegg, SSC, Bugatti, and a couple of others were in the race for breaking the 300 mph barrier a few years ago. Bugatti eventually succeeded with a 305 snd change run. The SSC Tuatara did 295 mph.
They made an easy roll out then kept shifting gears. I love how they found more gears after 150. They were definitely aided by the downhill as you could see how their speed dropped pretty good once they hit the uphill.