.257 Ferret wildcat cartridge

[Powercat]

I am looking for specs on a .257 Ferret wildcat.
I have only seen a picture of one. This is not the
.256 Ferret that was the forerunner of the .256 Win Mag
which started on a 357 Mag case. This one uses a
small rimless case like .223 Rem or .221 Fireball.
If anyone knows of this one I would appreciate hearing about it.

 

[Fuj]

I think it may be the 25/30 carbine case. RCBS had dies for it
and a few were chambered in Contenders.