Mec Super 250 was one of Mec's first loaders featuring a collar that went over the hull. These are superb with Federal paper Champion hulls, work slick as hell. The old red paper WW's, to the green paper Remington's not as well( they aren't waxed). Some plastics can be a SOB. Make sure the inside of the collar is smooth and CLEAN as you can keep it, a 12 ga brush with a wisp of 4 ought steel wool and WD40 chucked in a power drill works great for this. Loaded a lot of shells on one, no they aren't fast or worth a lot but are a versatile useful tool. MB
