You're welcome...I was fortunate to be into milsurps several years ago when 8mm was anywhere from a nickel a round, to twelve cents a round, and 7.72x54 was about a dime a round to twelve cents a round.
Yes, there is some corrosove 7.62 x 39 out there, but I'd stocked up on civilian at that time and had not bought any, but a Google search will identify what is corrosive.
Don't hesitate to shoot corrosive 7.62 x 39 in your rifle, as it's easy to clean.
I have a Romak 3/PSL which is basically a AK chambered in 7.62x54, and all I shoot through it the last ten years or so is corrosive ammo.
