Could the best extractor be a spring-loaded one like Sako's, but with the bottom relieved, mounted on a Mauser-type bolt so that the case slides up under it to be control-fed? Then, if a ham-fisted shooter bumped the bolt forward, pushing the cartridge ahead of the extractor, the rim would still be grabbed when the bolt locked up.

Does anyone make a bolt like that? Not having been in the market for a new rifle for many years, I have lost touch with the state of the art.