Any hardwood will get you to that weight pretty easily. With cedars, should be able to find some 23/64 shafts that will help you reach that weight. Much more difficult with 11/32 diameter shafts. You'll need to ask your supplier for his heaviest cedar shafts when you order, in the neighborhood of 475-500 grains or more to start. Cutting to length and point and nock tapers will take off 50 or more grains off the top. Most suppliers won't have 11/32 cedars that heavy, or won't have many of them. By soaking my 11/32 cedars in Watco oil, I can usually add about 50-75 grains, and I start with the heaviest 11/32 shafts I can find. Cut to about 30 inches, 29 inches BOP, I can just barely reach a 650 grain arrow with a 135 grain point. Sometimes have to go to a heavier 160 grain broadhead.