"...Is it still made?..." Yep. Aside from Winchester, Remington, Black Hills, GOEX, Tex-X and a company called Ultramax load it. Uses an 80(1410 to 2257 fps) or 100(1169 to 1984 fps) grain .310" jacketed bullet. (Speeds are out of my Lyman book and are the range of speeds using several powders)
Like Ben says, it's good for CAS, out of rifles and handguns(evil in Canada, of course). Not many of either being made though. Uberti makes a couple at long dollars. $1300ish at Shooter's Choice. You'll likely be able to find a used Marlin or other rifle around.