Most 7.62x54R is NOT reloadable. You're best with newly made stuff. Lapua is king of the 7.62x54R brass but well worth it. Hirsch Precision http://www.hirschprecision.com as well as Epps, Milarm should have it.

Milsurp is generally .310 diameter Berdan primed stuff. If you get a 7.62 x 54R rifle, make sure that you slug the bore before you invest in any bullets. VERY FEW of these milsurps (Russian, E. European or Finnishicon) use 308 diameter bullets, yet virtually all US load data was developed using .308 bullets. This simply means that accuracy will be bad using many of these recipes, which is often a complaint of MN owners that reload.

It's best to take Stevo up on his offer. You'll get to play with one. All of the MNs use the same action; that is, they are made in Russiaicon. The Finn rebuilds are Russian captured or purchased actions.

Have fun!