You can get it to work with a few tricks. The main problem is the case is so short, the Ejector runs out of room the mag you want is the style that uses a block. You can (and people have), modified stock SA mags by creating a block for the back of the magazine & modifying the Follower. MDT makes this style magazine. https://eabco.com/mdt-104174-magazin...-etc-12-round/

As for the Ejector, by removing a little from the back stop of it, it should give just enough extra to eject properly. Like the picture below. Also, make certain you replace the factory .125” Ejector bearing ball with the larger .140” size. These mods performed and many have successfully run the BR case in the Savage without issue.