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DUDE __EVERYONE is wrong except the guy tlking about the 169 gram destoyer_ ide say star plastic.
BUT hearing that your maxing out at 300 maybe 330 ,i would say get a 170ish maybe lighter champion candy VALKERYIE.
Valks hold the world record the last i checked 880 feet in australia ..My star destroyer is 175 and i can throw it at least 475 feet turning over.You need to get a disc that you can anhyzer and watch it soar back to the left and land straight,thats how you get maximum distance.I dont know how old you are or your skill level though so its hard to say what would really work for you.
A dx yellow 169 cheetah will do some crazy things with no wind..