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I got a Ruger #1 in 7x57 at a very good price because it did the same thing. After a little homework I found that the sight rail was slightly loose & would travel vertically, and of course when a scope is mounted this is hard to detect. A little blue locktite and proper torque on the screws & I now have a 1.25 or less MOA rifle 5 shots, slow fire... yes you still have to watch out for the heat with that thin barrel. But it is a hunting rifle and the first shot from a cold barrel is always right on.
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