Ok, here are a few more guesses... the Beech Starship flew at around 330kts and there was some weird Italian executive turboprop that flew pretty quickly. It is definately not a King Air, speed is not their forte. I know Metroliners and Merlins were sold in executive configs too... the Cessnas were pretty quick. The PC-12 is not too quick nor the Piper Meridian. Ok, well I have listed all the corporate turboprop aircraft I can think of. One of them is bound to be quicker than a Citation 500.
Stop drop and roll will not save you in hell. --- seen on a church marque in rural Virginia