Twenty years ago I was able to buy some pretty high quality ramin wood dowels at the local lumberyards and hardware stores. Heavy, pretty straight, good grain and made some really good, tough arrows. The stuff I've looked at lately is lightweight, crooked as all get out and wouldn't even make very good tomato stakes. Grain runoff or run-out is not so much twist as the grain runs at an angle through a relatively short distance on the shaft instead of running straight the whole length (or mostly) of the shaft. A shaft with runoff like that is much weaker and likely to break along that grain line. Worst case scenario breaking at the stress of a shot release and the string drives the sharp broken end of the back half of the shaft into your bow arm/hand.