To echo the previous posts, AFAIK all milsurp 7.62x54R ammo has corrosive Berdan primers, including the brand new stuff when it's available. To this day, the Russians supposedly will not use non-corrosive or Boxer-style primers because they reportedly don't perform as well in extremely cold weather.
However, don't let this scare you. Contrary to what the guy who's always sitting on the stool at your local gun store tells you, it won't ruin your gun, because there's a readily available solvent for corrosive primer residue- it's called warm soapy water.
After you shoot your Mosin-Nagant, run a few patches soaked in WSW through the bore and wipe down the bolt, the top of the mag follower, and the insides of the chamber, receiver, and mag housing. Then clean again with powder solvent and oil like normal. There's no special techniques or secret Super Whatsit Magical Mystery Bore Solvent needed.
To answer the original question, the Finnish M28 and M39 are widely considered to be the best Mosin-Nagant carbines. They were rebarreled with higher quality barrels than what the Russians or Soviets ever used.