I'm not sure if this needs a new topic to be legit, but I'll give it a whirl. I have several boxes of the first iteration of the .423 Barnes X bullet (without the grooved sides), most are in 400 but one of the boxes is 350 grainers. I'm wondering if anyone here has data they've developed for the .404 with these early X bullets. If you have and you're willing to share it, I would greatly appreciate it. Thanks!!