a novel rolling cone rock bit includes a plurality of pdc or other cutters mounted to the leg of the drill bit and positioned to cut the troublesome corner of the bottomhole . the plurality of cutters may be the primary cutting component at gage diameter , or may be redundant to gage teeth on a rolling cutter that cut to gage diameter . consequently , the occurrence of undergage drilling from the wear and failure of the gage row on a rolling cutter is lessened . another inventive feature is the inclusion of a mud ramp that creates a large junk slot from the borehole bottom up the drill bit . the resulting pumping action of the drill bit ramp speeds up the removal of chips or drilling cuttings from the bottom of the borehole , reduces the level of hydrostatic pressure at the bottom of the borehole and minimizes the wearing effect of cone inserts regrinding damaging drill cuttings .