From The Manufacturer/Wikipedia/People Smarter Than Us:
The Model 25 sports a brand new action, specifically built around cartridge cases with a rim diameter of .378 inch–the .223 Remington family. Not only is the action a true short action, it is much smaller in diameter than most bolt-action rifles on the market today. The Model 25 also boasts a newly designed three-lug bolt that is nothing like the Model 110 that has been the flagship of the line for more than 50 years now.