Portage, Killer243,DM,OEH...

FYI and perhaps in support of your personal observations:

30-30 (Barnes):
170gr.
2160 fps
Taylor Knock Out Index of 16.2

35 Remington (Hornady):
200gr.
2000 fps
Taylor Knock Out Index of 20.5

Wider, heavier bullets have their own special way of delivering the goods.

EKM

[Then again, so does a nice long, stout sledge hammer handle. ]