Hello, Brand new member here. I have been doing some research on my Single Six revolver in .22 caliber. It is of 1957 mfg. I love the gun and use it extensively to pop rattlesnakes on my hunting lease - I have a mayo jar full of rattles! Please correct me if I am wrong; this gun did not come with an extra Magnum cylinder, so it has a slightly smaller bore than the later "convertible" guns. I've been looking for a Magnum cylinder for it, will a New model cylinder fit? Will a Magnum cartridge fire safely from this gun? Will the Magnum cylinder need to be fitted or timed by a gunsmith or Ruger? Or can I do it myself? If I do this, will my LR cylinder still work? This is the first revolver I have ever owned, very sweet gun. It was in very nice condition when I got it, but it has some holster wear to the finish now. Definitely not a safe queen! I searched through the forum a bit today- tons of great info! I imagine I will be spending some time here for sure! Thanks :D