Holy du ck. Why not just use a regular ol RCBS fl sizing die and be done with it? No need to overcomplicate chidt. New brass gets ran through the sizing die, checked for proper length and then chamfer the inside and outside of the neck. Fire and then repeat the process. Starline makes damn good brass. Theres no need for a mandrel this or bushing that. Especially if you are talking moa accuracy. However, if the brass is a problem, id contact starline.
