I typed “Lake City Match” into the search function but could not bring up the articles you mentioned. I’ve never had much luck searching on the IAA Forum.
Regardless, I remember the threads and I have photos of the different bullets somewhere in my files. Could it be that the “pull marks” that you described are actually stretch marks on the bullet ogive as a result of the point swage? I don’t recall having any of the test bullets that had been pulled. All swaged bullets will have ogive stretch marks. Some will show up more than others.
Without being able to specifically identify the bullet, you cannot ID your cartridge beyond saying it was one of the 7.62MM Special Match test cartridges. It’s like saying I have a Cal .30 cartridge.
With some good photos of the meplat and ogive of your bullet we can probably narrow it down to one of two possibilities, and maybe even ID it positively. Of course, you can always pull it and then we’ll know for sure. Aren’t you curious? Not knowing would drive me nuts!