Frankly, I do not see any difference in results when comparing the 30/30 and .44 Mag from rifles.
I have shot a deer at ranges within 75 yards with both. I like the 170 grain WW Silvertip in my Marlin 30/30, and the Speer 270 grain JSP in the Marlin 1894.
Both kill deer with a single bullet. Both are reliable killers, and accurate enough for me.
I say be comfortable hunting with either of them.
The 30/30 Ackley is another story, outclassing both the 30/30 and .44 mag/