By the end of the 2nd crate you could tell the groups were opening up. By the end of the 3rd crate she went from 3.5" - 4" to 5.5" - 6". I have no idea how many rounds where fired though it before I got it but it was refurbished and looked heavily used. That 3rd crate could of been its 5000th round or its 10,000th round.
Also when it was coming to the end there, the rifle had consistent failures to feed and was stovepiping live rounds. Apparently it was because the one of the rials the bolt carrier road on was worn out lower than the other. Again, this rifle looked heavily used when I got it so your mileage will more than likely be better than mine as yours looks really nice.