Bought a OM BH in .45 Colt yesterday at a gun show. Can't pick it up until Tue.( Illinois) Looks almost new unfired to me. No dragline on the cylinder and no holster wear. A couple of small spots of surface rust on the hammer. Since this is my first OM, can someone here school me on what I've got ? Are the old models prone to have undersized throats? Are they as strong as a modern BH?