[caveat emptor]

35 Rem. and the 30-30 Win. are about the same in ballistics.

Depends on how much difference "about the same " means to you.

In the early ‘50s, Marlin advertised this as the “brush-busting .35,” though today we know from exhaustive testing that virtually no bullet can go through heavy brush without being deflected. However, as an active deer hunter in my younger days, I noticed that the .35 seemed to take down white-tails with distinctly more authority than the more popular .30-30. Noted Henry M. Stebbins, one of the great rifle authorities during that period in American firearms history, “…the 336 was not planned as a mountain rifle. Adding the .35 Rem to its lineup made it one of the best-liked rifles for those who want considerably more than .30-30 power, but not high velocity or flat trajectory.”

[Beagle8U]

"Depends on how much difference "about the same " means to you."

Yes, that is true and ballistics is something that can always be debated.

I read the link you posted and it is good solid information.

However, both the 30-30win. and 35 rem. produce nearly twice the FPE required for deer sized game at 100 yds with factory loads and it is unclear how much difference 200-300 FPE will make in that situation.

I will say that a handloader can bump the 35 rem up to 220 grain bullets and gain 50 grains over the 30-30. That would be an advantage for black bear.

The 35 rem. cartridges will likely always be available in the future but if you get to your hunting camp and realize you forgot to pack your ammo, the general store in Podunk may well not have them.

The 30-30 cartridges are available most anywhere ammo is sold.

Pluses and minuses to everything. Thats what makes talking guns interesting.