Computational predictions of bistatic acoustic scattering from an object buried in the seabed are compared with experimental data from a trial conducted at a shallow water site in the Baltic Sea in May 1999. The object, a concrete-filled tractor tyre buried in the sediment, was insonified by Ricker pulses from a ROV-mounted parametric transmitter. The scattered field was registered by an eight-hydrophone vertical array at ca 16 m range as well as a single hydrophone placed on the seafloor vertically above the tyre. The experimental results are compared to predictions by full-field theory for acoustic scattering from 3D bodies in a layered fluid-solid medium. The tyre is modelled as an acoustically penetrable fluid body with parameters characteristic of concrete. The field is computed numerically by the XFEM-S code based on a frequency-domain boundary integral equation (BIE) formulation and Fourier synthesis of transient fields. Parallel execution on a PC cluster is used to enable computationally demanding broadband excitations of the presented type to be handled within manageable time. The experimental data show a good ping-to-ping consistency, indicating a satisfactory stability of the experimental configuration. Waveforms recorded by two receivers at high signal strength locations are investigated in detail, and a good agreement with model predictions is observed. The spatial distribution of scattered energy is found to agree well with model predictions in directions near the specular scattering angle, while showing some evidence of un-modelled effects of roughness and seabed inhomogeneity in directions outside the bottom reflected main lobe.