I use the ELD-M in my Lapuas (as well as a 300 Berger), but never shot the ELD-X. However, in one of my RUMs I developed a super accurate load with ELD-M 225s, then switched to an ELD-X for hunting. Initially, I thought the two bullets were identical except for a thicker jacket on the X. Once I loaded them, I found out this is not true; the ogive location is different. I have shot three animals now with the 220 gr X in my RUM. First two dropped on the spot (antelope and a deer). The third one, a deer, ran about 20 yards but didn't leave a drop of blood. Ranges were 310 to the antelope, 150 to a deer (DRT) and 100 to the deer that ran 20 yards. All three animals had lungs that were pulverized. No exits. No appreciable bullet recovery.
Reason for my long winded story: I am disillusioned with the X - performed as I would have expected an ELD-M to perform. A few years ago I shot an antelope with an Edge; bullet was 300 Berger and range was about 130 yards. Bullet left a 2" exit wound. Much better performance.