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.
The steel jackets on the bullets will wear the bore a bit more then copper does, but would still be thousands and thousands of rounds. No damage to the chamber from steel casings....
Here is a good read on steel vs brass/copper jackets. Keep in mind these guys were running barrels red hot and not cleaning frequently.... both those add to bore erosion. http://www.luckygunner.com/labs/brass-vs-steel-cased-ammo/
I run Tula/MFS through my Nork M14 and haven't had any issues.