Gallium additions to the Cu‐Sn bronze matrix in the production of Nb3Sn wires by solid‐state diffusion raiseHc2(4.2 K) of the resulting compound to ∼25 T. This increase inHc2, which is not accompanied by any significant increase inTc, is associated with the incorporation of gallium into theA‐15 compound which has the approximate composition Nb3(Sn0.9Ga0.1). Critical currents in a variety of Ga‐containing wires, all reacted at 700 °C, have been measured in fields up to 23.5 T. This is the highest field at which steady‐state current measurements have yet been made. The pinning force is found to be closely proportional toh1/2(1−h)2, wherehis the reduced field.