While you are on the site, in your browser find and click "Add to Home Screen" A CGN beaver app icon will then be created to your phone that is directly link to the site.
Note: This feature may not be available in some browsers.
I can't find any specs on the 42 Berdan.........but....you can use 45-70 brass to form 43 Spanish in a set of 43 spanish dies in 1 operation. It is a tad short but works fine. A much more economical option than paying 3.50$ or so for 43 Spanish brass. Good luck with your project.
I had 43 spanish brass and the extractor on my Berdan had trouble grabbing onto the rim - kept slipping off and not extracting my brass. Your mileage may vary.