I know even my Savage 243 like the 85gr Sierra better but it was still accurate with 100gr loads.
If I were to compare the 85gr Partition (or similar) to a 100gr core lokt, not sure you could tell the difference in the animal.
I will tell you the 85gr Sierra will kill a deer and with authority, IF hit in the heart/lung area from a broadside shot. I would not take a shoulder shot with that bullet. Now a partition might be another story.
The 30-30, in my opinion, kills in a different manner. It relies on good expansion of a soft bullet that is fairly heavy for caliber, as in the 170gr load. It penetrates well, usually with complete pass through on deer, and opens well. Since it is using mass to penetrate and expansion to kill, it does not NEED the high velocity to do its job. Hence less recoil.
Now when we try to load them like a 308 then the picture changes.