Hornady, Buffalo Bore, Winchester, Fiocchi, S&B, and PRVI all produce 9mm Mak ammo. You could buy up some of that and reload the brass. Hornady makes XTP bullets and Speer makes TMJ bullets for it. There's also a few different cast bullet companies that make suitable bullets if you don't mind lead.
For 7.62x54R, PRVI, S&B, Winchester, and Wolf all make brass cased loaded ammo. PRVI brass is very good in the few calibers I have, better yet, its the cheapest too. Hornady and Sierra both make .311 jacketed bullets but some people report having bores bigger than that so those may not do you any good. Hornady had paused the production of their .311 bullets but they're supposed to be resuming that here shortly.