After 38 years of gunsmithing and having always liking the 257 Roberts, I finally made one for myself. Mine is on a FN Mauser action and is throated .165 longer than standard. The barrel is a gain twist finishing at 1 in 12 at 24 inches. I contoured it to .540 at the muzzle. In a reshaped factory Marlin stock and wearing a Weaver K-4, it weighs 7 3/4 pounds.
So far, it has fired 16 100 grain Hornadys over 4350. Shoots well and will get carried for predators this winter. GD