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In the late seventies I purchased a used S+W model 17 that was about 10 yrs old and looked like new on the outside. I had pretty severe extraction problems with LR ammo and opon examination I could see rings in each of the chambers about half way down. No matter what kind of solvent I used I could not get them to come out. The empty case sticking was so bad I sent the gun back to S+W to see if the rings could be polished out. I got a call from the repair department and they told me that the rings were caused from firing shorts. Also if the rings were polished out the chambers would be just out of spec, so to make it right they recommended a new cylinder be fitted. The question is not if shorts can eventually damage a chamber because they can. The question is how many shorts does it take before you start seeing damage. I will tell you what I am not about to find out because I will not use them in any of my guns. If I have to use some sort of low powered ammo it will have the long case.
 

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Mike you are exactly right on what was happening to cause the fired cases to stick. I can tell you that the damage to the chambers was so slight that you could hardly see it. If I fired just a couple of rounds I could eject but things were a little sticky. Three or four it got worse and a whole cylinder full I would have to bang on the ejector rod. The gun being a revolver compounded the problem because of multiple chambers. I thought it was a bad cylinder with some tool marks. Smith And Wesson diagnosed the problem as firing a steady diet of shorts. I did find out later that the only ammo the previous owner fired in the gun was shorts. I tracked him down because I thought S+W might be trying to give me the business on a defective gun but they hit the nail on the head. The bottom line is if enough shorts are fired they can burn in.
 
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