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Some 7.62x39s will shoot .308 diameter bullets pretty good. Some won't. It's probably worth the $20 to find out if yours will shoot accurately with the 135 grain SST. That bullet is designed to expand at lower velocities although I don't know how low. The .30-30 bullets will also expand at lower velocities, but RN and FN lose velocity so fast you would gain nothing in yardage.
The situation is dismal if you need .310 or .311 diameter bullets. There are 123 and 125 grain bullets designed for deer sized animals in the 7.62x39 or varmints from the full sized rifle cartridge. The 150s I know of are intended for full sized rifle cartridges. There is factory loaded 150 grain ammo for the baby Russian and one may hope that it is loaded with suitable bullets, but those bullets are not available to handloaders.
Fortunately, this does not ordinarily matter. It's only when you start pushing the range limits that the 123-125 grain bullets start getting iffie.
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