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.
Yep it would be useful for loading up a bunch of mags before a range trip. At the range, I will probably use the good old hand loading. They would be especially useful if you are loading Beowulfs.