Originally Posted by John_Deer
It sounds like someone bought a 22 wmr cylinder for the gun but never mated the cylinder to the gun. Each new cylinder has to be hand fitted to the gun. There are a set of clearances. I would have a feeler gauge/dial indicator in hand and call S&W tech support. You might have to call more than once to get a helpful technician. Keep calling back until you get or find the needed data. If you don't feel comfortable fitting the cylinder take it to a gunsmith. That would be a good job to start a relationship with a talented gunsmith.
John, the gun I have is a Colt Peacemaker and the the Magnum cylinder actually came with the gun I believe. I could be misstaking but since my grandfather passed the gun down to us in its orginal Colt box and has never been fired, it has lead me to this conclusion.
I did do some research on Colts website to see if they would address the problem but I found out I would have to ship it from an FFL and that it was probably not going to be under warranty. So, it looks like I will be bringing it to a local gunsmith.