At a recent trip to Ft. Lowell park, where there was a Civil War demonstration, my six-year old son asked the man standing next to the canon, "Is that a Hotchkiss Mountain Gun?" The man, slightly stunned, said, "No, but it's very similar." Later, this same son asked another "soldier" if his rifle shot "223 Remi's". Again, his question surprised the gentleman.
You may be curious, like we were, where he got his information. An episode of "Top Shot", which he watched with Daddy, taught him about the first, and a walk with Grandpa on which he found such treasured brass, the second.