6 Dashed to 6BR?

[ireload2]

Set up a few junk .270 cases and mash them into a .243 FL die. Too much lube will ruin them. A little practice and careful monitoring of lube will permit them to be formed with a very long neck.
That is how the manufacturers have to do it too.

I stand corrected. I thought the shoulder would be crushed and wrinkled downward. Hard for me to picture it flowing upward into the form of a long neck. I keep my calibers simple to deal with.