Among other things I study this in school. Im currently writing a journal article on paul mauser and his famous 93 and 98 family of rifles. Kind of stating that he was the Kalashnikov of his day. He is the only other designer who could boast about 100 million rifles beign made under his designs. If I get it published lll post it here. Also doing a piece on Hiram Maxim, the man who invented "the devil's paintbrush".
I also grew up around a German Colonel ww2 vet for a grandfather so I was cleaning his k98 and M1 garand with him at 5.
SOme bolts extract by what I call the bump method. See the extractor grabs the rim of the cartridge. Yet the extractor only removes the cartridge from the chamber. Then as the cartridge is being pulled back it will encounter a little speed bump. This bump is not your typical speed bump for it is parallel to the cartridge. See once the cartridge bumps this speed bump it sends the spent cartridge flying out.