Commercial Manganin gauges were used as in‐material gauges in planar shock experiments. The Hugoniot curve for 2024‐T351 Al was determined in the 0–10 GPa range and was found to coincide with that of 2024‐T4 Al given in the literature and measured by other techniques. The longitudinal sound speed was determined as a function of stress and it was found that Poisson’s ratio decreases while shear modulus increases in this stress range.