For shoot shafts, I prefer hardwoods (sourwood, viburnum, hazel, dogwood, buffalo nut, etc.) Softwoods like pine or poplar make good split-timber shafts. I've made good shafts from pine, poplar, and ash by splitting sections of log into "boards", then sawing/splitting them into 3/8" x 3/8" squares and planing them down to 11/32" or so. The pine shafts will be lighter and break easier than the hardwoods, much like commercial cedar shafts.