Described herein are iron golf club heads and sets of iron golf clubs that have variable weight distribution. Each iron golf club head has a cavity and a groove with a raised portion disposed therein. The groove and the raised portion can deepen the center of mass depth and lengthen the effective face length of the iron golf club. The width of the groove may vary between each golf club in a set of iron golf clubs, such that the width of the groove of the long irons is greater that the width of the groove of the middle irons, and the width of the groove of the middle irons is greater than the width of the optional groove of the short irons. Other aspects, embodiments, and features are also claimed and discussed.