Llewellyn, magazine capacity on model 41552 is 3 , not 4. Other calibers are 4 round, 300 WinMag has a 3 round magazine. A built-in hinged floorplate magazine means no lost detachable mags while allowing for faster unloading. You can find this information at Franchiusa.com , although the website is not the most user friendly. You can also read it in this article >>> thegunmag.com/franchi-expands-momentum-rifle-line-with-new-color-options-350-legend-chambering/ .....Have a great day!

Llewellyn, this model uses an internal Hinged Floor Plate 4+1 Magazine. Cheers and stay safe! --- Example : hunter-ed.com/newyork/studyGuide/Magazines-Tubular-Box-Type-and-Hinged-Floorplate/20103502_138197/

The magazine is internal with a hinged floor plate and holds 4+1 rounds