This study aims at comparing numerical crystalline aggregates behaviour simulations performed by finite element, with experimental results of a study involving complex loading paths applied to a sheet of OFHC copper at room temperature. Material texture is taken into account. To investigate the plastic behaviour of materials during complex loading modes, combinations of sequences of simple loading paths such as tension, simple shear, rolling, cyclic tension-compression, with different orientations with regard to rolling direction, are considered. The material used in the study has been cold rolled and annealed. The so marked cubic texture is measured by X-ray diffraction. Specimen are mechanically and electrolytically polished, then marked with several gold microgrids, with a 4 $\mu m$ step, on a 500 $\mu m$ area, to measure local strain fields on the specimen surface. Furthermore, the global strain are measured by classical extensometry and strain-stress curves are plotted. Finite elements simulations corresponding to the experiment are realised with a polycrystalline aggregates taking into account the material microstructure. A 3D mesh which respects grain boundaries is used and the measured texture is represented. Several single crystal models are considered. They introduce the 12 slip systems of the octahedral families. Various assumptions are considered for the description of the self-hardening and of the latent hardening. The comparisons between the simulation and the experiments are made at two levels: the global level, with the description of the macroscopic stress-strain curve, and the local level, by considering the local fields. It is demonstrated that the whole batch of tests gives the user a very good information about the slip system interaction.