Apple have removed Cartridge Chooser because I haven’t updated version 1 for an arbitrary period.

The fact that Cartridge Chooser is designed for minimal maintenance and remains current through regular library updates isn’t a consideration. The latest library update incorporated Nosler’s new line of cartridges and Weatherby’s new 6.5mm Magnum.

In any case I am working to remedy this through a release of version 2.

Please be patient.

“If it isn’t broken don’t fix it”!