I need a #21 or #22 Mec bushing to throw some AA Super Handicap powder into an AA hull, but the bushings aren't available locally.
Smaller used bushings I can find. So I thought I'd drill one out until it throws the powder weight I want.
Glories of the Internet: I found a guy who estimated the internal diameters of MEC bushing based on a couple he had. Not sure how accurate it is, but it's a start.
MEC bushings Internal Diameters from Shotgun Forum.pdf