The 7.62x39 Russian is loaded with a .310-.311 bullet. I have been checking it out as I just picked up a Mini 30. The new Hornady steel match is .310 as are the Russian rounds I have measured. Trying to get my hands on some other US mfg to check bullet size. The Mini 14 rifles were never meant to be long range. If you want 300 yards +, get a good bolt action in a decent caliber.
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"I would not be an old man if I had not been an armed young man." JTJ
I was taught to respect my elders but they are getting harder to find.