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.
Really depends on what and where you'd be shooting. But coming from the handgun world, a .44 RM carbine might be a good idea. If lighting off a KSRH7/9 is a piece of cake for you, then adding several inches of barrel and a stock for higher velocity and better control might be interesting. Plus, you might have all the dies, equip etc for hand loading and have a good understanding of the ballistics (at least at the low end ).