I have a number of pistols plus one SMG in 7.62x25, so decided to buy another case of ammo. Marstar is selling a case of Sellier & Bellot milsurp. 2280 rounds to the case.
It arrived today. I was surprised to see that the case was a mixture of two different kinds of ammo. The brown boxes were steel cases with steel core bullets. The white boxes are brass cases and lead core bullets. That is, the case is a combination of indoor and outdoor ammo. Bonus!
I transferred the ammo to a pair of steel ammo cans. My case of ammo yielded about 60% lead core ammo.
I already had a couple cases of lead core ammo, and actually ordered the Marstar ammo so I would not have to waste my lead core ammo when shooting outside.
The case was sealed with a steel wire. I assume that Marstar has no way of knowing what is in a particular case. It might be 100% one kind or the other, or a mixture, like mine.