As part of a larger programme we aim to test densely-packed binary mixtures of monodisperse hard sphere powders to determine local structure, to correlate with ratio of large:small radii and volume fractions of the components. This work will be used to compare SESANS results with USANS, where SESANS is expected to be able to help address issues of multiple scattering and coherence length of the beam corresponding to the length scale of the probed particles. It will also separate the effects of size in the micron range from size ratio between the spheres.The results will be used to compare packing results with those achieved for macroscopic particles (e.g., steel spheres) to determine nanometer scale influences. Ultimately this will lead to theory to help give insight to high packing fraction systems, an issue of high industrial and theoretical relevance.