I've shot the 127 LRX in my 26 Nosler. It's second in accuracy in that gun to the 120 TAC-SX which shoots almost half MOA at 400 yds.
I've not shot the LRX in my 6.5-284, as it does so well with 140 Hunting VLD's. I would think you'd have gotten a bit more velocity with the RL-17/127 LRX combo in the 6.5-284. I get a solid 3K with 140 VLD's over 48 gr. RL-17.
I plan to shoot the 127 LRX in my 6.5 CM. Will report.
DF