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.
Go here. http://www.vihtavuori-lapua.com/downloads.php
N150 isn't given for 7mm Mag though. That just means data is not on-line. It's very close to IMR4350 in burn rate. A bit faster.