I just found this forum and an old thread on this topic. I have recently inherited a Super Blackhawk with a 6 1/2" barrel. The gun is in like new condition. I looked closer at the box, with a penciled on correct serial number, and it says it is for a 7 1/2" barrel pistol. What do I have? I have found bits and pieces of information about this gun. One referred to this variation as a S46. What would be "THE" source to check? I have sent to Ruger for a letter. The serial #26048. Thanks for the help.