Do a google type search for a 1967 Winchester model 94 30-30 and some sites will come up were people are asking what they are worth.
http://en.wikipedia.org/wiki/Winchester_Model_1894
The some of the info about the changes is at the Bottom of the article.
Quote from My Hornaday Cartridge Reloading Manual. "For the Deer Hunter who hunts in areas where 100-150 yards are the longest shots, the 30-30 is more the sufficient."