Thank you - great information!The x is supposed to have a thicker copper jacket with a larger cavity below the plastic tip than the m does. The x is also supposed to have some what of a shank/swedge inside of the copper jacket that helps hold the lead core to the jacket upon expansion. Some folks have cut/split the x down the middle and found that the shank/swedge inside is very minute. I have used the old Hornady sst, which is an older version similar to the x with less b.c. It was a lightning fast killer. Many instant kills with the old sst.
Looked at pictures on the net. The bonding ring is rather scan. Would have missed it had there not been an arrow pointing to it.After seeing cross sections of each bullet, the x has a thinner jacket in front the bearing surface to aid in expansion, and it does appear to have a "bonding" ring to hold the lead into the lower half of bullet shank.
I had exact performance results last year on 2 deer. Neither had an exit, struck soft tissue on both, neither left blood trail. One at 75 yds the other at 200yds. This was out of a 6.5 creedmoor. I have since switched to 140 gr sierra bts. Aint looked back.I've seen identical performance from both X and M. At high velocity impacts very shallow explosive wounds with no exit. Poor performance in my opinion. Below 2600 FPS I see good results. Solid expansion solid penetration down 2000 fps. From 2000 to 1700 fps expansion is good enough and lots of penetration. These results are with 162 x and m started at 3190 fps as well as 208 and 212 started at +-3300 fps.
pictured is an ENTRANCE wound on a 156lb 8 point cull. Bullet did not exit or break the far shoulder on a broadside shot. High shoulder hit impact velocity 2871fps 162eldx. Broke the entrance shoulder and the deer ran ~150 yards with no blood trail this was a really hard tracking job due to no blood trail The field was full of deer just breaking dawn and I had no idea where he ran I came back a few hours later and found it after an hour of looking View attachment 173797
Congratulations on your elk. Fine eating for a while! Looks like X is a nice round.The big hole is in the other exit 212 ELD-X 300wm 2960 shot elk at about 150 yards. I've shot this load on two Elk now and works great