Don't mean to be argumentative but are you saying that the accuracy went to hell because you shot out the barrel or for another reason? You can do that with a 15-22 as well I'm sure. How easy is it to get a replacement S&W barrel and at what cost? You can probably get a 10/22 and a replacement aftermarket barrel (or a truck load of almost brand new take-off factory barrels) for the same price as the 15-22. Now if you want to bad mouth the accuracy (or at least consistent accuracy) of the some of the factory 10/22 barrels I'm with you all day.
Also one of the best things you can do for accuracy on a 10/22 is have to your bolt radius'd and firing pin pinned by someone like these guys.
http://clintrfc.tripod.com/
http://sites.google.com/site/quesplace/

