Only two guns were available at SHOT Show, 2013 for the new Winchester Super Magnum rimfire cartridge. By next year there will undoubtedly be many more.
The Savage B Mag has some new features that make it well suited for Winchester’s newest hot rimfire. This is an all new platform for rimfires from Savage. Rear locking lugs, cock on close, eight round rotary magazine, threaded barrel and an adjustable accu trigger TM. MSRP is $349.
For more info see this link: 17-winchester-super-magnum-rim-fire