Alrighty then;back into the story. A couple of weeks ago I sent a die back to CH4D to have it looked at because I thought the radius at the neck/shoulder may not have been properly made. Well I found out I was in the wrong, not the manufacturer. Take home message: Read The Instructions.
1. Lube and run into forming die.
2. Trim and run into neck ream die and ream.
3. Run into full-length die and load'em up.
I tried full-length sizing without reaming = bad; the thicker brass was causing the little imperfection at the neck/shoulder. Oh, the die I received back from CH4D is in fact polished to a gleaming surface inside.
So since I had a free day I reamed 50, formed, flashhole deburred, .378 Weatherby cases. Now I am trimming them. Yes, I didn't read the instructions. But it's working. I will note that .378 brass takes significantly more effort to make the final shoulder push-back in the full-length sizing die. Next time I will buy more .338/378 brass.
I only have 46 more to go. Then I'll ream the primer pockets and be ready to load. A pain, but it sure is fun. When my arm gets tired from spinning the trimmer I read a chapter of my latest fav book.
I hope to load some shells next week and ladder-up IMR-7828, RL-25, RL-33, and Retumbo to see what gives me a good combination of pressure and accuracy.