All.357 revolver ammunition is.357 Magnum Off topic: Not true, there is.357 maximum. It is basically a.357Magnumcase lengthened.300'.
Here is a link to Ruger, and you can check the age of your Ruger firearm. My Single Six was born in 1990, and my Super Blackhawk was born in 2001. Beginning Serial Number: Years of Production: 550- 550- 550.
Firearms that are chambered in Maximum can also fire.357 mag and.38spl. Ruger produced Blackhawks in this round from 1982-1984.
Remington was the only factory that made ammo for it iirc, factory brass can still be found. I still have two boxes of factory ammo for my rifle (.357 Max over 12 ga) chambered in this powerful round. line Back On topic: The gun the OP is discussing is probably as others have stated, a 3 screw BH.
Ruger will do the transfer bar safety conversion, without the TBS I would carry with the hammer on a empty chamber.
Ruger Blackhawk Serial Number History Blackhawk Revolver (manufactured from 1956 to 1962) Caliber: 44 Magnum Beginning Serial Number: Years of Production: 1 1956 741 1957 5996 1958 The above chart shows the approximate first serial number shipped for the indicated year. This number should be used as a point of reference only. It is not necessarily the very first serial number shipped, but it can be used to determine the approximate year your Ruger firearm was shipped.
Ruger does not necessarily produce firearms in serial number order. There are occasions when blocks of serial numbers have been manufactured out of sequence, sometimes years later. Also, within a model family the same serial number prefix may be used to produce a variety of different models, all in the same block of serial numbers.
And in some cases, firearms may be stored for a length of time before they are shipped. For details on your specific serial number you may contact our Service Department: 336-949-5200 For serial numbers manufactured prior to our electronic records, or for an official letter confirming the details on your firearm please download and mail in the form. Copyright © 2016 by Sturm, Ruger & Co., Inc.