Hi fellas,
I always make sure that, on any mauser rifle , the bolt will close on a chambered round whether the rifle is designed to be controlled feed or not. Most ex mil actions have been modified but I have found some have not. You can't rely on the CRF to work every time and the time when it doesn't work is when you need it most especially on a Dangerous Game rifle. In a dicy situation, when you have emptied the mag and haven't put the animal down, you need to be able to chuck a loose round in there and slam the bolt home whithout having it jam on you. IHMO.
Cheers.