A war bow is a self/lam bow most of time and perhaps an inch across at the shelf. If one is not playing that historic game of battle rounds with them, armor busting may not be a priority. While I am sure they may be a viable and fun longbow to shoot, like other self longbows, the spine requirements because of efficiencies and left of center dynamics, the spine requirement will be less than say a 110 pound bow of a more modern design. A good way to find the spine and if 29" bop is standard, would be is to find which aluminum arrow with standard fletch and a moderate point the bow likes. I would bet that anything from a 2020 to a 2317 would work, depending on point weight, but I would not be surprised if the 2020 was it.