Krinkle

From the Dillon manual: "You'll soon learn to judge the correct amount of bell by simply looking at it. In the meantime, you might want to use your dial calipers to check it. Twenty thousandths of an inch greater (at the mouth of the case) than the original diameter, should about do it." Hope this helps.

New guy from Athens, Alabama. Just bought the Dillon XL650. I received it two days ago and am working on setting it up. Glad this site is here for all of the information I'm sure I will need.