The die swell and other viscoelastic characteristics imparted to a rubber compound by different elastomers and reinforcing fillers are very relevant to compound performance in extrusion, calendering, molding, and other factory operations. In this study, an ARC 2020 capillary rheometer was used to measure the die swell and other rheological behavior at different shear rates. Model rubber compounds were prepared and tested. Processability characteristics were also measured for these mixed stocks using the RPA 2000 with EDR. Comparisons were made of the performance behavior for these compounds. Statistical analyses were performed on running die swell and relaxed die swell vs. tan delta and G’ under a wide range of applied frequencies and strain amplitudes. Observations were made and discussed for the tan delta inversion crossovers which may prove useful in quantifying state of mix and degree of in-situ silanization during the mixing process.