Brian the C425 will do 245kts all day long...did you know the Conquest II with -10s will do 305 or better?
Gosh what about 'Vmo' on that aircraft?
Tell you what Brian...you grab your 'Conquest Pilot' you got right there, tell 'her' to grab her manual, and I will ask, a specific question on a specific page...and see if she can look it up? ok?