45MAN Good question, that probably needs researched.

Looks like the Magazine is a Magpul in the AICS configuration. This is a good thing as the AICS style is the most popular bolt action detachable magazine.
In the 308 Rem 700CP Pistol the Magpul MAG549 Magazine should work with about all of the 308 family of cartridges. This is a 5 round Magazine.
Chance it will not feed any of the Fat Short Magnums. It should work with any 308 size case from the 22-250 thru the 358.

I am sure that the 223 and 300 BO version uses the Magpul AR15 Magazine and probably any other AR15 Mag.

Lets hope that Mark gets a 308 version. I have AICS 308 Magazines to check the fit.

Bob