Re: ?Controled round feed?
There are two basic ways bolt actions pick up and feed from a magazine.
One type is the push feed. It uses the magazine lips/rails to guide the round from the magazine to the chamber. Modern rifles that use this type feed include Post 64 Winchester model 70s, Remington 700s, and Savage short and long action bolt actions.
The second type of feed is the control round feed. It uses an upside down U shaped boltface. The shell head engages up into the bolt face from the magazine as the bolt moves forward. The bolt takes control from the first time the case is engaged. The bolt face kinda looks like a horizontal reloading shell holder. The following rifles use this methodology in transfering the case from the magazine to the chamber. Mausers, Pre-64 Winchesters, Dakotas, Montana 1999.
Many dangerous game rifles utilize the control round technology. The theory is once a round is engaged it can fall out until it is ejected.