.270Wby, Barnes TSX's and H4831 question

[270Geo]

I want to give Barnes .277 150 grain TSX's a try in a Weatherby .270. For those of you that have used 150 grain TSX's and H4831 powder what(OAL, grains of powder, primers) has worked for you? I have found plenty information on 130 grain TSX's but very little on the 150grain TSX's. I have reloading manuals but want to know what works in your Weatherby .270. Thank for the help. -George