Thant might work, if I remove the expander ball.the 6mm Creedmoor brass is the same as 6.5 Creedmoor only necked down to 6mm. Might find 6.5 CM dies for what you need (Sizing the base)
Redding makes a type S bushing die.Yup if you find a small base bushing die for 6.5 Creedmoor you can use the proper bushing for the 6mm and do all the sizing in one step.
I have one for the 6.5CM. Wanting to know if someone made one for the 6mm CM.RCBS makes a small base for 6.5 Creed.