Hmmm I entered this thread hopeful.
I have this: (Image removed from quote.)My dad brought it home from WWII. My mom was going to throw it away when she moved from her childhood home in the country to an assisted living apartment complex in a nearby town several years ago. I spotted it going through all the stuff she was getting rid of and saved it (along with a lot of other stuff including my childhood Springfield .22 rifle).
Is that an ATR round?