Here is a chart comparing the 35 remington to the 30-30. Good luck finding brass, bullets or ammo for the 35 remington. My buddy has a 336 35rem for sale but I passed because I couldn't find anything to shoot out of it.
http://www.leverguns.com/articles/compare.htm This is a neat site for lever gun buffs.
If you want to shoot deer 300 yards away why not just get a 270 or 30-06? At least my local WM has 30-06 ammo in stock. And good luck with finding any of the recommended 308 ammo either.
I have wanted a 35rem for a long time. But since I got a Marlin 44 mag I am sure I can do just about everything with it out to a hundred yards or so that the 35 will do. And the 44 mag kills the snot out of deer.