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In order to achieve high performance in a compact envelope, some Advanced Pump-Fed engines must operate at high chamber pressure while maintaining high component efficiencies. The most significant technology advancement required to bring this engine concept to reality is cooling of the combustion chamber under these conditions. The leading candidate chamber cooling system makes use of a chamber regeneratively cooled with N204 oxidizer. Columbium (Niobium) is one of the candidate materials being considered for the chamber. It has the physical and thermal properties required for cooling and structural integrity, and is compatible with the corrosive N204 in the normal engine operating environment. The chamber design approach employs a machined columbium alloy liner with rectangular slots milled onto its exterior. After filling the slots with a removable filler material, they are 'closed out' with pure columbium using the Chemical Vapor Deposition (CVD) process to enclose and form the coolant passages.