A fairly large revolver that has a variety of different barrel sizes and caliber options, the largest being .44 Magnum. The Ruger Super Redhawk is chambered in much larger calibers. The one pictured has the 7.5” barrel in .44 Magnum.
Aside from the Ruger 10/22 rifle I own, I haven’t had much experience with their revolvers. Generally when people think revolver they go to Smith & Wesson or Colt.