fyi - I asked Barnes for their recommended load data for the 175 and 200 gr. LRX for 300 Wby Mag, and here is their response:
"We are simply suggesting the TSX data for use with equal weight TSX, TTSX, and LRX bullets. For the 175gr LRX we are suggesting the 180gr TSX data. See attached."
I am just starting to work up these loads in my rifle, so I do not yet have any experience/info to report.