Per Remingtons ballistic web page......
.35 Remington 200 grain Core-lokt, Muzzle velocity 2080, energy 1921.
.30.30 170 gn Core-lokt, Muzzle velocity 2200, energy 1827.
Here's the suprise to me,
.32 Winchester Special 170 gn Core-Lokt
Muzzle velocity 2250, energy 1911.
Retained energy at 100 yard......1st .32 Winchester Special, 2nd 30.30 Winchester, 3rd .35 Remington.
However, if you handload........the .35 can do much better........the .35 has been very popular around here for many years and is one of those cartridges that kill better than it should.......
I haven't found any penetration test......but I would think the momentum from the .35 would be greater........
There is not much difference in the above 3, and your right, it would be much easier to find ammo for the 30.30........I read somewhere on the internet that the 30.30 outsold the .35 50 to 1.........
I think I'd rather have a .35 for hogs......that said, how many spirits can dance on the head of a pin?
This could be fun to play with:
http://www.remington.com/ammo/ballistics/ballistics.htm