That was the 12 gaugewith thick barrel that they built on the 10 gauge frame if I remember correctly.H&R used to sell a single shot rifled slug gun - the Tracker II, IIRC - back before the Remington conglomerate put them out of business. It came with a 7/8" diameter tungsten carbide rod in the bolt hole in the stock to add weight. That was probably the single most expensive part of the gun, but it sure shot well with sabot slugs!