Sorry, I just can't accept the premise.
I understand it is popular to state - -
The 7.62x39 is pretty much ballistically identical to the 30-30 . . .
Really, they are a bit farther apart than this indicates.
Remington factory figures show:
.30-30 - - - - 150 gr. RNSP -- MV: 2390 100 yd. vel: 1973 ME: 1902 100 yd. eng: 1296
7.62x39mm - 125 gr. PSP - - MV: 2365 100 yd. vel: 2062 ME: 1552 100 yd. eng: 1180
The .30-30's 25 grain heavier bullet, with the blunt round nose profile, starting at a similar velocity, not only has greater
paper energy - - life experience demonstrates that it really does "hit harder."
One point I'll yield: Their trajectories up to about 150 yds is practically identical.
Compare for yourself at the Remington ammo site at:
http://www.remington.com/ammo/ballistics/ballistics.htm
It is easier to fit most any .30-30 with a good aperture sight than an SKS. The .30-30 has the advantage of being able to use 170 gr bullets, in case of need, as in very close range hunting, or if big hogs are the game.
Best,
Johnny