Yes odd Rugers shoot well. A retired gunsmith acquaintance - another rimfire hobbyist - told me Ruger at times outsourced for barrels and even got some from Ed Shilen - a prominent US barrel maker. Get one of those and you'd have a wee gem. Common barrelling issues were sloppy chambers, uneven rifling (you could push a slug down barrel and it would be properly tight, then loose, then tight etc), and most commonly poor barrel receiver pinning/connection.
@muzza - Winchester of course made the 190/290 semis and they enjoyed no great regard. Do you know anything of the Winchester model 490 semi? This was supposedly made to higher standard by winchester at time they made the 9422 levers. They only made a few - know anything about them? The 9422s from that period are gems.
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