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.
not easy with the scope and stock in place but my dial caliper is at 1.175, mine is 338lm, i don't know if the 300wm are the same
hope it will help you