I think I seen the data on the Nosler site. I think you'll find though that the 300 ab is just a little much for the 338wm. But to each his own. I think the 225 ab is about perfect for the 338wm. Do a search for " long time long ranger" posts. He has shared a wealth of info on 338wm with different bullets and weights. I like shooting the Nosler 200 B. tips,210 parts, 225AB. For Sierra 215 spbt, 250 spbt. The Speer 225 spbt shoot well also in my 338's.
Also welcome and Enjoy all the info the fellas here at LRH share and their help.
Gene R