It seems that this round exhibits very good performance in bare gel, but I can’t find much information regarding its performance through barriers. Could anyone point me in the right direction?
What are you considering as a barrier and for what purpose? There are LE and mil units using 6.5 cm. However, I doubt any of them are using the eld-x as its not a bonded round. Ironically, most of them are using match ammo.
You can apply online at Hornady Military-Law Enforcement Guide and they will send you a link for the gel tests if you are LE or Military.
I have an old one from 2018 that shows 147 grain ELD retaining from 52-80 grains through the various test media. Penetration from 12.5 to 16 inches. I imagine the heavier jacket of the 143 would improve on that.