I have 2 MN's, a 1942 91/30 rebuild, and a like-new late prod. Model 44. The ammo that has been good about extraction from both rifles have been the Hungarian light ball lacquered steel case, the Albanian brass, Bulgarian brass, the Wolf copper covered steel case, and the Czech steel cased target ammo (the light weirdly shaped bullet type with low recoil).
The ammo I have had trouble with in extraction has been the Czech steel cased lacquered light ball, this ammo, while accurate, has been the number one complaint in the other chat rooms on Mosin Nagants too. On my 1942 model I have to frequently pound on the bolt to get it to pull out of the chamber and come out, on my Model 44, less pounding, but it still fights me. I have put 4 boxes from different ammo sellers of this stuff through my guns, so I doubt it is a lot problem.
Too bad about the Hungarian light ball becoming scarce, I bought quite a bit of it at the last 2 gun shows, and now it seems to be drying up as I have not seen any since. I am leaning toward the Wolf copper covered light ball ammo as it is non-corrosive, cheap if bought in bulk and was very accurate in my 91/30. :-)