Good evening guys!

I'm hoping someone here has run in to this before and knows a solution to my question. Its finally time to start my build from a .270 to a 7.62x39. I'm slowly getting the parts together and I'm stuck when it comes to the magazine. Savage made a 10fcm with a 4rd dbm but I can't find them in stock anywhere. Is there another caliber that will feed this round reliably? My rifle is currently set up as a blind magazine but I am not opposed to the box magazine route, even if it means a new stock. Any help y'all can give me is much appreciated!

Thanks!