That's a well-known rule.
When I lived in northeastern Montana there weren't many elk up there, even in the Breaks. But the young son of the sporting goods store owner drew a bull tag, and the kid killed a spike a couple days into the season. This was a pretty special event in our small town, and the local paper ran a story about the deal, complete with a grainy black-and-white photo of the gutted spike in the back of their pickup in front of the store. The reporter asked the hardware store owner how much his boy's elk weighed, and the proud father said, "Right around 900 pounds."
