Bagtic--Old rims are turned of to slightly smalller
than extractor groove of bmg case. Then threaded
5/8 x 24 and 12ga size rims screwed and loctited on..
Here is pic showing case threaded ready to take rims
shown in pic.If you ask is it worth effort,well I
hace a case fired 36 times, no resizing needed on bottom
half of case.Case good for couple hundred firings.Ed.

[Linked Image]

Ed Hubel