Quality-wise Poly-Tech (State factory 26) builds the best Chinese guns. They are stamped with the number 26 in a triangle.
If yours is non-corrosive, it would be a lot better than that stuff.
Shoot that Marlin `93, that`s what they were made for.
Avatar photo; my GGF, b 1830/ d --, Civil War Vet.
Back in the early 80's 7,62x39 was a real hard round to find. I had a blade bayonet Chinese made SKS that was a VN bringback...and like yours it was super rough. It even had a bullet strike in the buttstock and another that compromised the hadguard/gas tube. In Keng's firearms early days they had a few rough imported parts for SKS's and I got a serviceable gas tube assy from them so my SKS was no longer a single shot. In the mid to late 80's I could buy 1100 round cases of Chinese 7,62x39 - two tins per crate and in 10 round chargers at $79 delivered. All late 60's through early 70's dated and it all went bang and shot nicely. I had as well a tula 1951 all matched but the mag box VN bringback in minty shape. The beater Chinese sks outshot the russki example all day long. The Chinese knockoff SKS rifles made in the 60's and 70's were fine rifles. Much more than their russki counterparts. I see anymore some fellas selling that era steel cored Chinese ball like it's rare. It's not. But some think it's equivalent to AP..it's not. Nonetheless it's good ammo but not worth what the market types want for it. Several of my friends stashed a lot of that ball ammo away when it was dirt cheap back then , can't blame them.