There are multiple candidate models for the von Mises yield stress in elastoplastic models that are used to simulate material deformation in high-velocity impact. Previous work has studied the effects of such models on quantities of interest in high-strain-rate deformation, in order to select the most appropriate model in comparison to experimental data [1-2]. This work focuses on selecting between three such models, based on their ability to reproduce time-varying depth of penetration data of a tungsten-alloy rod impacting a hardened steel plate at high velocity, measured by Anderson, Hohler et al. . Novel in the present study is the systematic treatment of uncertainty in the process, and automation of the process. The three models considered are the Johnson-Cook (JC), Zerilli-Armstrong (ZA), and Steinberg-Guinan-Lund (SGL) flow stress models [4-6].