In my 338 LM Improved (124+ gr. H2O) I saw 3,100+ in load testing without pressure (108. gr. RL-33), but I backed down to 3,000+ node (105.5 gr) because I was nervous the summer in Vegas would run it over pressure. My tube is long (32"), which didn't hurt the quest to find a higher node.
But if you want 3,200+ fps for a 300 gr. 338 projectile, I suspect you are looking at something using a CheyTac case, regardless of the variant you are using.
JeffVN