If you're not dead set on a straight-sided barrel, Rice has an Early Dutch Lancaster profile barrel that can be had in .60 cal. I picked one up in .60 cal. at Dixon's in July. It's 41" long, 1.3" at the breech and 1" at the muzzle. Slimmest proportion is at 0.850. They also have a Light Hagga profile that says can be had up to .62 cal. It's about 1.15 " at the breech, 1" at the muzzle with the slimmest proportion at .850. I was going to have to wait on the Hagga profile, (at least a year), so I took the Early Dutch barrel since he had one sitting on the table. Not sure of the weight, but it feels like it will be relatively light to carry around while hunting.