
Though the interrupter should prevent the rims from locking, it still does sometimes happen if the interrupter is out of spec or is overloaded by a shrunken or damaged stock or if the action screws are too tight.
The Finnish No-Jam Magazine, used on the M39 Mosin rifle, ensures against failure by automatically stacking the rims in the magazine.
http://www.smith-sights.com/hvmag.php
Regards,
Josh