cadron-creek,
I have never heard of one either, and I thought I had heard of just about everything. There is supposed to be the long awaited(2years) Lipsey's K1A in .250 Savage, but it has not been made yet.
I "never say never" when discussing something Ruger made, however it is more likely a custom barrel job.
Only way to know if it was made that way from the Factory is call Records; 603-865-2424. Let us know what you find out.
Or, if you would rather, PM me your serial# and I will call for you and let you know.
If it is a Factory produced .250 Savage, it is an extremely rare No.1; most likely made up for a friend of Mr. Ruger. That is the only way these "one of a kind" rifles were made.
Just like the 1A .32 S&W Long for General Vernon Megee.


El Numero Uno
a Serious Collector of the Ruger No.1 rifle;
a Modern Classic Sporting Arm