Was there not a report here a while ago about some new , therefore short chambered , rebbl'ed Garands being released without having been headspaced? This may be the case here. Pull the rifle down then see how the bolt will close ( gently , by hand pressure only , stripped bolt ) on a go gauge. Lacking one of those , try a round of your ammo . I'd pull the bullet and dump the powder first to be safe , but if chambering by hand with a stripped bolt , the danger of an AD is slight , but still present.
Chris