@Bob Nelson35Whelen
Yes,indeed.
7x64 is very similar to 270 winchester, 7 rem magnum and 280 Remington. And probably few more, but those come first to mind.
But this is also closely related to American gun culture.
In USA wildcatters are common, some make it to the standardization up to SAAMI then to CIP and factory production, some fade away, and some are alive just for seldom use by few enthusiasts
But in America, it is easy, with mostly friendly laws, and large market.
In EU.
New cartridges are reluctantly planned and rarely designed and put in production. Gun production is severely controlled, and gun ownership always under scrutiny - which affects civilian market, and then product marketing. Putting new caliber on Europan market is a planned commercial risk.
In my country, all hunting gun production has stopped in small gunshops (except for one large factory).
As per local law, each new gun must be proved in CIP proof hose. And in the same time, we dont have proof house nor license from CIP. (Nice paradox?) So, this makes small production impossible.
So, this means that when a licensed gunsmith makes new gun (or even just change the barrel) he must go to neighboring Austria to make one CIP proof test. 1000 km trip, cross two countries, for 20 eur CIP proof test.
So no sane gunsmith wants to make new custom gun, nor to change the barrel on old gun. Its pain in the neck.
About wildcats
There is government data base of all calibers and rifle models that comes from actual registry of civilian guns.
The database mainly relays on SAAMI and CIP standards, plus actual gun models imported and registered on civilian market.
So when some new gun is first time imported or registered in the country (new model), or new caliber first time registered in the country, they take it from legal owner and send it to forensic testing and expertise, before they update the database with new gun/caliber, after which it can be registered
This can take few weeks or few months.
(My friend imported 260 remington bolt rifle - first time in the country, and it took two months to complete registration with forensic approval, i was joking with him that his rifle rifle was collecting rust and scratches in some humid govt warehouse for 2 months, waiting for inspection just because he did not listen to me to buy some vanilla well known caliber, or god forbid manbun 6,5 CM).
After first caliber/or rifle model is registered and entered in database, the second legal owner of same rifle/caliber will register routinely.
So, I dont know about other EU countries in specifics, but you get the idea of the entire set of continental complications that industry and private legal owners face.
This is the reason why most of new calibers are designed in USA, and many of them came from wildcat community.