A turbine bucket comprising: an airfoil having a tip shroud, a shank and an entry dovetail; a tip shroud seal projecting radially outwardly from said tip shroud and extending continuously between end edges of the tip shroud in a direction of rotation of said airfoil about a turbine axis; characterized by: a cutter tooth carried by said tip shroud seal for enlarging a groove in an opposing fixed shroud, said cutter tooth having a center point located with reference to X, Y and Z axes, where the X-axis extends axially in an exhaust flow direction, when the bucket is mounted in a turbine; the Y-axis extends in a direction of rotation of the turbine bucket, when the bucket is mounted in a turbine; and the Z-axis extends radially through the intersection of the X and Y axes; wherein said center point is located 1.49 cm (0.588 in) along the Y-axis from the Y=0 position, and wherein said Z-axis is located 1.31 cm (0.517 inches) from an outside edge of a seal pin extending along said entry dovetail, as measured in a direction normal to the shank of the bucket; wherein said Z-axis is located 4.7 cm (1.866 inches) from a forward edge of a forward tang on said turbine bucket entry dovetail, as measured along said X-axis; and wherein a Z-axis =0 position, when the bucket is mounted in a turbine, is established at a distance of 61.21 cm (24.1 inches) from longitudinal axis of rotation of a rotor on which the turbine bucket is adapted to be mounted, and wherein a radially outermost edge of said tip shroud seal is located 28.64 cm (11.275 inches) from said Z-axis =0 position. an airfoil having a tip shroud, a shank and an entry dovetail; a tip shroud seal projecting radially outwardly from said tip shroud and extending continuously between end edges of the tip shroud in a direction of rotation of said airfoil about a turbine axis; characterized by: a cutter tooth carried by said tip shroud seal for enlarging a groove in an opposing fixed shroud, said cutter tooth having a center point located with reference to X, Y and Z axes, where the X-axis extends axially in an exhaust flow direction, when the bucket is mounted in a turbine; the Y-axis extends in a direction of rotation of the turbine bucket, when the bucket is mounted in a turbine; and the Z-axis extends radially through the intersection of the X and Y axes; wherein said center point is located 1.49 cm (0.588 in) along the Y-axis from the Y=0 position, and wherein said Z-axis is located 1.31 cm (0.517 inches) from an outside edge of a seal pin extending along said entry dovetail, as measured in a direction normal to the shank of the bucket; wherein said Z-axis is located 4.7 cm (1.866 inches) from a forward edge of a forward tang on said turbine bucket entry dovetail, as measured along said X-axis; and wherein a Z-axis =0 position, when the bucket is mounted in a turbine, is established at a distance of 61.21 cm (24.1 inches) from longitudinal axis of rotation of a rotor on which the turbine bucket is adapted to be mounted, and wherein a radially outermost edge of said tip shroud seal is located 28.64 cm (11.275 inches) from said Z-axis =0 position. a cutter tooth carried by said tip shroud seal for enlarging a groove in an opposing fixed shroud, said cutter tooth having a center point located with reference to X, Y and Z axes, where the X-axis extends axially in an exhaust flow direction, when the bucket is mounted in a turbine; the Y-axis extends in a direction of rotation of the turbine bucket, when the bucket is mounted in a turbine; and the Z-axis extends radially through the intersection of the X and Y axes; wherein said center point is located 1.49 cm (0.588 in) along the Y-axis from the Y=0 position, and wherein said Z-axis is located 1.31 cm (0.517 inches) from an outside edge of a seal pin extending along said entry dovetail, as measured in a direction normal to the shank of the bucket; wherein said Z-axis is located 4.7 cm (1.866 inches) from a forward edge of a forward tang on said turbine bucket entry dovetail, as measured along said X-axis; and wherein a Z-axis =0 position, when the bucket is mounted in a turbine, is established at a distance of 61.21 cm (24.1 inches) from longitudinal axis of rotation of a rotor on which the turbine bucket is adapted to be mounted, and wherein a radially outermost edge of said tip shroud seal is located 28.64 cm (11.275 inches) from said Z-axis =0 position.