And what will we learn from knowing what grade of steel was used in various shotgun frames? It might really mean something if they were all of the same design. But we are seeing an apples to oranges comparison. Design probably has much more to do with frame failures in shotguns than the materials used to build them... which is why I respect Ted's observations that Tobin frames stretch due to having too much meat machined out of them.
Brass frames are perfectly adequate for some firearms within design limts. The current Henry Big Boy Cassic has a brass frame and is chambered in .44 magnum and .357 magnum. With proper design, polymer frames with minimal steel reinforcement are working quite well in many handguns generating higher chamber pressures than the average shotgun.
