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The accurate measurement of dc current from 1 A to 3000 A is of interest in many fields, including metrology, power generation, and multiple industries. Current measurement is often performed using Hall sensors, Anisotropic Magneto-Resistive (AMR) sensors, and dc resistance shunts. Each of these devices have limitations and all require calibration to provide traceable current measurements. This paper examines the difficulties encountered when making accurate current measurements using dc resistance shunts at currents up to 300 A. The advantages in stabilization time, stability and reduced uncertainties when making current measurements using a direct current comparator transformer (DCCT) are then discussed.