Influence of texture on the stress-strain curves experimentally measured in the elastic region by neutron diffraction of an extruded Cu rod is shown. Stress-strain curves are computed with elastic polycrystalline properties calculated with and without taking texture into account. Texture information is obtained from the pole figures measured by neutron diffraction as well. Calculations of elastic polycrystalline properties with texture are carried out according to geometric mean model. The advantage of geometric mean averaging recently developed for diffraction elastic constant calculation is experimentally confirmed.