In many, many thousands of rounds (into the tens of thousands) of TulAmmo through two specific ARs in my safe, I can say without equivocation or lack of specificity that NO...the TulAmmo did not cause any
more, or any
less wear than brass factory, or my own reloads.
This is Lucretia Borgia...my "Perfect AR15" built to be ultra light, ultra fast handling, and to make the alleged legend of the AK47s reliability into a myth. Lucretia digested 15,000 rounds of TulAmmo and Wolf, and some Czech Spam Can 5.56 over the course of a year and in more than a few 3-Gun matches and she never hiccupped.
My "cleaning regimen" consisted of a good spray down with brake parts cleaner every few thousand rounds and a ****** of "awl".
This is my Ruger SR556 Piston Rifle (First Run) and it ate TulAmmo and Wolf with similar results as those I experienced with my beloved Lucretia. That the piston guns run cooler, the laquer in the chamber is not really an issue.
This is my AK74....which melted after a 500 round range session.
On the table is my "other piston gun"....a SIG516, Gen 1. It is just as sassy as Lucretia and the Ruger. It eats everything you stick in it.
Finally...my POF entry gun, SBR/CAN/NFA Happy Switch...it will eat steel ammo as long as the can is NOT in use.
I have some experience with the AR...here is the deal...if built right, then steel cased ammo is not an issue. MilSpec chambers and common sense will keep them a-runnin.
Anxiety will only cause impotence.