Even if they did, which is highly unlikely, they probably would change something about the case dimensions so someone couldn't accidentally chamber it in a 223 and if they change the dimensions of a 20 Practical aka 20-223, it would no longer be a 20 Prac.
They could rename it the 20/223 so there shouldn't be any misunderstanding about chambers. It should sell better than the 204 since brass is cheap especially for prairie dog shooters. In fact why not stop making 204's?
Also, if there is a better barrel twist, that would be the time to make a change.
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