for warbows, I like them 75-78" long, 1 1/2" wide, and slowly tapering to 1/2"nocks, with a more or less flat belly.
Elb's just need to be shorter, as they're usually drawn 4" shorter, and less weight. So, you may go down to 67-70" long, and a 1"- 1 1/4" wide, flat belly (for around 40-70#@28")
Nick