Laser-driven shock and ramp experiments allow for unprecedented experimental access to the behavior of matter at extreme conditions, and recent advances in dynamic compression techniques allow for the combination of dynamic compression with in situ x-ray probes. In situ X-ray diffraction reveals phase transitions of density jump too small to resolve in traditional dynamic compression techniques and gives us insight into the nature of phase transitions. In this talk, we will talk about studies on metals such as Cu, Fe, and Fe-Si alloys to better understand their dynamic response.