Mighty Armory.
I have that already, Cheytac won't fit in it. It's great for 338-378How about the Frankfort Arsenal hand deprimer? I was looking at the universal decapping dies for the .338LM and none looked large enough to accommodate the case body. I saw one in action and it worked slicker than snot. I picked up one the next day. Well made out of mostly metal. I don't know how much larger the case body is, but that could be your ticket.
No problemI am sorry the Mighty Armory did not work. They say all Magnums. I guess not really all Magnums.
No Sedan MTNo problem
Are you actually in Sedona?
It would be expensive but contact Newlon precision. Have him make you a FL blank with the proper decapping Rod. Then have your smith chamber the die.
A Wilson decapping base would work too.
Sinclair might make you a custom decapper.
What's wrong with decapping while you size?
Just brainstorming here...
Joe