To my knowledge there is no SAAMI specification for anything like .44 Magnum+P+ or +P for that matter. That rating is just a marketing gimmick used by the manufacturer. In light of that little speck of information, the Smith & Wesson N-Frame .44 magnums could not be "rated" for ammo which has no SAAMI Spec.. I don't know how any other manufacturer deals with this. I do not believe that Ruger has a formal written warranty-just what is mandated by State and Federal consumer protection statutes. They have an in-house service policy which is discretionary and subject to change if and when Ruger sees fit. Currently it pretty good.

Bruce