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In this work, a cross-laboratory comparison is conducted to critically examine experimental techniques within the High-Strain Rate Mechanics of Materials Laboratory at the University of Utah and the Experimental Solid Mechanics Department at Sandia National Laboratories. The study is aimed at identifying, quantifying, and reducing sources of uncertainty in reported Taylor–Quinney coefficients. Vacuum arc remelted 304L stainless steel specimens extracted from the same ingot are tested in both laboratories under dynamic tension at nominal strain rates of \dot(epsilon) = 450^{-1} and \dot(epsilon) = 900 s^-1 . Independent experiments at both the University of Utah and Sandia National Laboratories report Taylor–Quinney coefficients of \beta_int = 0.85 and \beta_int = 0.9-1.0 for \dot(epsilon) = 450^{-1} and \dot(epsilon) = 900 s^-1, respectively. Sources of variation between labs and practices to mitigate these are also discussed.