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 think the 1-9 twist would be good for the 75 gr. bullets. Yes it is possible to use this twist and I think it is preferable to the standard 1-14, or 1-12 which limits you to light 55gr bullets.