Re: 338/375 Ruger or 375 Ruger with high BC bullets?
I agree Whidden makes a good die.
This whole 7mm/375 started as a lark. I had purchased a box when they were introduced. I wanted to see if I could neck down a 375 case with available dies. I would have had Whidden make me a FL/bushing die too but I am getting excellent accuracy and it is easy enough to size with the dies I already have so I won't.
Good luck on your project!