Yes, I also shoot the .25 Stevens RF, and have about 7 boxes of old Cannuck ammo for mine. Considering the ammo is tough to find, and expensive now, I don't shoot mine often. But it's such a accurate shooting gun that I can't let is simply sit in the safe and never shoot it!
Mine is a Ballard #3 that is marked on the underside of the barrel, "Re-rifled by J Stevens Arms." and ".25 Rimfire" beside the first marking. The markings are the typical Stevens style as used on their guns. It also sports a J. Stevens full length telescope.