Even more important than late war is the fact that the Japanese made special trainer rifles. They were meant to shoot a special low pressure round. I have a few of them. Seems that one of the local dealers here gets them real often.
they are usually single shot and are marked quite differently though. pretty easy to tell the difference and they are certainly not safe to shoot. There are rifles that were retired from military service by the Japs though, they were put to use in schools as training rifles, usually just worn out but still shootable. I had a T38 that had been retired, sent to a school then forced back into army service near the end of the war.