We found the 127g LR to be easier to tune than the 120 Ttsx in three custom 6.5s of various calibers. Tiny groups.
That's good news.
In my 26 Nosler, I got slightly tighter groups with 120 E-Tip and 120 TTSX than with the 127 LRX. All are sub MOA at 400 yds.. Have not tried the 120 GMX, although I have a box. The 129 ABLR wasn't as accurate, not MOA.
I would like to try the 127 LRX in my Creed, Swede and 6.5-284.
DF