Welcome to the site, from reading you post I says to me me it just jumps out to me that I would say you have a scope problem. Sounds like the classic scenario. Just because a scope is new, or it is from a top maker don't mean that it isn't bad. I would try a different scope. The rifle should easily be able to shoot 1/2 to 1 inch 3 shot 100 yard groups, all day long. Cross pin failure does happen but it is a rare problem, I would look for the reason why it broke.
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