If you want to compare Chamber Dim's with Die Dim's you can make a ferrosafe cast of both. When you have both in hand remember they should not be the same, die has to size smaller than the chamber.

However the easy way to go is use a bushing neck size die and forget about the rest. Once the brass is fire formed no need to go back to the F/L dies. Long as it will chamber with the F/L die size first time it's all that's important.

Boats