  Neutrino cross section and oscillation measurements depend critically on
modeling of hadronic final state interactions (FSI). Often, this is one of the
largest components of uncertainty in a measurement. This is because of the
difficulty in modeling strong interactions in nuclei in a consistent
quantum-mechanical framework. FSI models are most often validated using
hadron-nucleus data which introduces further uncertainties. The alternative is
to use transparency data where the hadron starts propagating from inside the
nucleus and the probability of interaction is measured as a function of hadron
energy. This work examines the relationship between the $\pi^+$ and proton
total reaction cross section and transparency from a simulation viewpoint.
