We have demonstrated efficient stimulated Brillouin scattering (SBS) of both single-line and mul-tiline hydrogen fluoride laser radiation near 3µm in high pressure xenon gas. Power reflectivity of >80% was observed in the single-line case. The expected 100-MHz Brillouin shift of the return was experimentally confirmed. High fidelity phase conjugation was also demonstrated using the single-line source. For both single and multiline experiments, the apparent Brillouin reflectivity was shown to significantly decrease if the SBS was not well isolated from the laser source. Preliminary SBS reflectivity results using the quasi-simultaneous -20-line HF laser source are presented.