I have seen several posts here that claim the 7.62x39mm "cannot compare" to the 30-30 because of the difference between a 123 grain bullet vs. a 150 grain bullet. Please tell me, where that 27 grains is going to make a difference? It is okay to have a preference. In fact, it is good that everyone takes the time to think these things out and form a position. But again, I can think of no place where the .30-30 would outshine a 7.62x39 with good bullets because of the weight disparity of 150 vs. 123 grains.
If we extend this line of logic that 123 grain bullets fall short somehow, then 6mm Remington, .240 Weatherby, and .243, with their 100 grain bullets, might as well stay in the gun cabinet come deer season.
Now, a .30-30 is not maxed out at a 150 grain bullet, as there are 170 grain bullets. This might start to be a factor if a guy was going after something like a European wild boar or black bear, but I can only comment with authority on deer and antelope.