Have not made a science of it, but I'm not aware of any standard that must be met before a rifle, cartridge, or bullet can carry a Creedmoor label.
Lifted from another site:
What can be patented ? Any “new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof” can be patented subject to further conditions and requirements of U.S. patent law.
We can have issues with some names, however, where a product is associated with a given region. There were once champagnes manufactured all over the world. Now any sparkling wine carrying that label must come from the Champagne region.
Sort of like "tactical." See applied everything from bolt handles to tooth paste.
