RE: 30-30 Lmao
I don't really have any hard evidence on which to base this fantastic claim, but I'd venture to guess that the 30-30 Win. has killed more deer than just about any other cartridge.
There's absolutely nothing wrong wth 30-30 as a deer hunting gun. There are many a hunter who harvested his first deer with a Marlin or 1894 in that chamber.
I'd take a 30-30 over a .243 for deer, in the Win. model 1894 based on the history of that gun alone.
A .243 might have an edge at long range, but in tight quarters or thickets, a 30-30 would perform markedly better.
I don't even own a 30-30, if that's what you're thinking. (I have a .32 w.s. lever action circa-1945 that has had no problem taking down whitetails)