I picked up a decent 38 rifle a few years back at a gun show. While I was cleaning it, I took off the butt plate and found a hole and a WWII vintage 6.5 round inside. The round was corroded but after cleanup I saw it had the 3 spokes around the primer. The hole itself looked like it had been bored out with a bayonet. I'm thinking this guy was storing his last bullet. Has anyone else found anything like this with their Japanese rifles?