I have two of the 58 huntsman's in my safe. There is no way it would be safe to shoot a rifle barrel on one of these frames. The fireing pin is as large as a large rifle primer, even if you "sharpened it" to fire a rifle primer, the primer would blow back along with the pin into the frame, shear off the set screw and do an automatic re-cock on the hammer at least. Very bad plan. They were made purposely so that a rifle or shotgun barrel could not be used on them, that is why you can buy them without any paper work. They do, however, shoot very well. Larry