The Ruger approach is exactly what I what I meant about reamer and chamber tuning to get what they deemed acceptable, instead of going with the proper bbl diameters. The steel core ammo that was all over then probably didnt do the Minis bore much good, even with the long throating of the bbl. They just dont compress like a std composition bullet, as Sharp or Whelen determined in the 1930s concerning the Mexican Match AP ammo that was in use. With the medium pressure range that the AK operates in Ruger probably figured it was not going to be a big deal and went with it. Just added to the iffy accuracy reputation that the minis had hung on them. Oh well, they are minute of ambush weapons, just not as ugly as the comblok stuff.
n4zov, what is the brass life in yours? and what is considered good accuracy for you generally. I test the weapon and then myself and if I can shoot as well as the gun will I'm a happy camper, doesnt work that way most of the time. I try not to blame my tools, but sometimes it is mechanical and traceable.