The first one is a Weatherby Mark V.
As far as the two Remington 788 bolts, sounds like one is standard bolt face (.470" for 22-250, 243, 308, 6mm Remington, etc), the other is small bolt face (.378" for 222, 223, etc)
The shotgun bolt is from a Winchester 1200/1300 shotgun
The Mauser bolt is from an 1891 Argentine Mauser. No claw extractor and collar eliminates 1893/95 Mausers.