Consumable electrodes of the alloys were arc melted into a water- cooled copper crucible skull casting to produce a molten pool of the metal. The liquid metal was subsequently poured into tungsten interfaced shell molds. These molds were produced by the REMET process in which initial tungsten slurry dips provide the non-reactive refractory surface. Thirty-four molds are scheduled in the program to optimize shell design, mold preheat temperatures and, finally, to produce usable castings for the properties testing phase. Configurations include the fluidity pattern, stress rupture bars, oxidation- thermal fatigue paddles, and Lycoming first stage T55 turbine nozzle vanes. Columbium alloys WC-3015 and B-66 were selected for study. Practice pours of columbium alloy CB-752 and program pours of alloys B-66 and WC-3015 indicate that these materials can be melted and cast into threaded test-bar shapes. Surface quality and soundness of these preliminary castings were acceptable. Surface contamination was not detectable for two of the alloys and only slightly so for the third.