From Win Mag to Hitler and Nukes in one post---Good Gawd, LOL! There is no way that rifle was out to the public 8 years ahead of when that caliber was actually introduced. Manufacturers nowadays produce some "newbies" for the top gun writers, etc. and then go out into basic production after that. The OP either has a rebarreled rifle for the 300 Win Mag or the H&H was not stamped on it if the barrel is the orginal because of what I stated earlier due to manufacturers not wanting to use proprietory names of others in the business. He should be able to easily figure out what he has and get back to us.