i made mine from oak. before you flame me, i used a bit of old mast making knowledge.
i cut my selected straightest run grain into quarter strips, each marked so i know where they came from in the blank.
i then swapped them end to end and side to side, so that any grain runout was supported by at least two other strips, and glued them up with Titebond III, which is waterproof and stays flexible.
i shaped it roundish, keeping the glued joint centred. sanded, stained and capped it with a turned down 30-30 case for a ramrod tip.
its 41 inches long and i can bend it so the ends are almost 90` to each other.
it works very well, and even warped somewhat so that it locks itself in the pipes and stays put.