A set of experiments at pRad are underway by Physics Division to study Richtmyer Meshkov Instability (RMI) formation and evolution in shocked Tin. Recently completed experiments include RMI into vacuum and into gas. The present work focuses on studies of multiple-sinusoidal mode targets. The study also includes an investigation of 2 mode targets to evaluate bubble saturation theory. The RMI experiments hope to address transport, particle breakup, and bubble saturation. One RMI experiment has already been modeled by AWE. Efforts are underway to model the experiments here at LANL in X-Division. Study tools include package modeling to inform experimental design, pRad, the Forest Flyer, and optical velocimetry. This work was funded by Weapons Science Campaigns 1 & 2 and included work by William Buttler, Michael Zellner, the pRad Team, and others. LANL Collaborators include AWE and LLNL. Both are interested in the experimental data and in modeling the data. Both LANL and AWE presented their results at the IWPCTM Conference at Santa Fe in June 08.