45King. I'll try. Hopefully I won't confuse you further. Pre 64 Model 70 Winchesters, Model 98 Mausers, Springfield 1903's are all examples of controlled feed rifles. Remingtion 700's, post 64 Winchester Model 70's are with some later exceptions, push feed.
In a push feed, when you chamber a round from the magazine, the bolt pushes the round into the chamber. If you decide not to chamber the round, IE not to shoot, you must fully chamber the round in order to enable the extractor to remove the round.
In a controlled feed action, such as the Mauser 98, when you feed the round from the magazine, the extractor will engage the cartridge before actual chambering. If you have not fully chambered the round, but wish to remove it, just pull the bolt back and the round is withdrawn. Chambering is not necessary. The round is under full control of the rifles mechanism.
On many military Mausers, the round must be fed from the magazine as the extractor will not pass over the rim of the cartridge. This includes many European sporters based on the mauser. You must do this even when single loading. Because of this, I have gotten into the habit of always single loading from the magazine even on push feed models. This is not necessary with the push feed.
Remember, the original purpose for the Mauser was war, and the controlled feed kept green scared troops from double loading the rifle, and causing a jam. The commercial models are based on the basic Mauser design.
Most sporting rifles today are made as push feed, because they are cheaper to manufacture. They are more than adequate for most hunting purposes. I would want nothing less than a controlled feed action if facing potentially dangerous game though.
Some of the controlled feed rifles today include, I believe the later versions of the Ruger 77 MKII, the more expensive versions of the Winchester Model 70, and some imports based on the original Mauser 98. The Mauser models 93, 95, and 96 "Swede" are also controlled feed, although weaker actions, strengthwise.
I hope I have cleared this up, and not confused you further. If you were here with me, I could visually demonstrate the difference real fast. Maybe there is a gun shop, or local gunsmith that can demonstrate the difference for you.
Paul B.