Don, when I was tinkering with a 6BR close to 20 years ago, there were several dies I used. It was about the time bushing dies were being used. I had three or four die set, Redding. Then there were some others and danged if I recall who made them, I have slept since then.
There was a body die. It did not touch the shoulder. Then there was another die that all it did was bump the shoulder. And, it seems like there was another die that bumped the shoulder and sized the body, it was also a bushing die.
Also had a "bump" die for a 7 TCU. It touched nothing but the shoulder.
Not saying there run of the mill made for the masses and available at your favorite gun shop.
I do recall a visit with Bruce at Redding years back on the subject.