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We report Chandra observations of the highly asymmetric core-collapsesupernova remnant G350.1-0.3. We document expansion over 9 years away from theroughly stationary central compact object, with sky-plane velocities up to$5000 d_{4.5}$ km s$^{-1}$ ($d_{4.5}$ is the distance in units of 4.5 kpc),redshifts ranging from 900 km s$^{-1}$ to 2600 km s$^{-1}$, andthree-dimensional space velocities approaching 6000 km s$^{-1}$. Most of thebright emission comes from heavy-element ejecta particularly strong in iron.Iron-enhanced ejecta are seen at 4000 - 6000 km s$^{-1}$, strongly suggestingthat the supernova was not a common Type IIP event. While some fainter regionshave roughly solar abundances, we cannot identify clear blast-wave features.Our expansion proper motions indicate that G350.1-0.3 is no more than about 600years old, independent of distance: the third youngest known core-collapsesupernova in the Galaxy, and one of the most asymmetric.

Expansion and Age of the Supernova Remnant G350.1-0.3: High-Velocity Iron Ejecta from a Core-Collapse Event