Yes, the stingray has been made in .25, but its very rare.
The Exocet is the same as the Stingray really, and the vulcan was its predecessor, allthough I doubt those were made in .25.
.25 barrels from webley overall are very rare. Yr best bet, that is, most made, was the Patriot in .25. But breechblock wont be a fit for the stingray.