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.
Winchester Model 1894 - Wikipedia, the free encyclopedia
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."
Below sort of explains the issue of shooting at a Deer 150 yars away that has a chest area from top to bottom of about 18-25 inches and the clean kill I was speaking of.
"ALL bullets begin falling at the muzzle when fired. For a typical 170 gr flat tipped 30-30, if the rifle is sighted in at 50 yards,
the bullet will strike 12 inches below the point of aim at 200 yards. If sighted in at 100 yards, will strike 9.2 inches low at 200. (at 70 degees F temp) Other cartridges, other zero ranges, other results."
In the above case sighted in at 100 yards and you aim at the middle of a Deer Chest on a Deer with an 18 inch chest you would likely miss and under shoot. If you guess and hold over the Deer you might hit it somewhere but not where you aimed.
Ideal would be if you were sighted in at the same range the Deer is but that does not happen often.
Sice it said at a 50 yard sight in the Bullet would drop 12 inches from the when the Bullet left the Gun to the time it made it to 200 yards. That means there is actually more than 12 inches of bullet drop for that weight of Bullet because the 50 yard sight in raised the Barrel a little.