A synthetic process for elaborating a nanocomposite of Ba2YCu3O7-y superconductor and silver was examined. Hybridization through grinding promoted the uniform dispersion of ultrafine silver particles (of the order of 10 nm diameter) in the Ba2YCu3O7-y matrix. The sintering process of the nanocomposite by hot isostatic pressing (HIP) suppressed undesirable grain growth of silver to the order of 100-300 nm in the sintered material. Enhancement of both superconducting transport current and magnetic flux pinning properties was promoted by the control of the post-annealing conditions of the HIPed material.