I am a new member, and I came across your post when I was searching for Co-Ax XL information. So, I joined this group so I could respond to your message. You may have already found information and what I am about to say, but I wanted to let you know Gavin with Ultimate Reloader did several videos on the XL and specifically a 375 Cheytac build he did. He used the XL to make the loads for his 375. You may find some useful information for you on that.