I am making parts for a company out of tungsten. They have a 1/4-28 unjf-3b thread. I am giving 2 gages the 3b gage to check the pitch of the thread and a 2b gage to check the depth. My tap goes the correct amount of turns but the 2b depth gage does not. Need at least 23 turns for proper depth I get 24 with the tap but only 16 with the gage any suggestions. I've tried retapping, reaming the hole after the tapping to get rid of any tapper but still only get to like 19 turns of the gage.