I just finished one up. On a tip from jawge, I chased off as much sapwood as possible as the closer to he heartwood you get the stronger the wood. I could only chase 1 ring but the bow turned out good.
I backed with cherry bark for some extra insurance. Ended up being 62" ntn, 35# @ 28" and bends through the handle. I probably could have piked it to gain some weight but I wasn't looking for high poundage and it makes a real nice, easy shooting target bow though it is legal for hunting if I so chose.