From what I've read, the 452 is the "better" gun. Whether this translates from internet experts to the real world, I don't know. I have a 452 and pretty happy with it. I don't like second hand guns, so would probably go with the 455 given your options. Bear in mind that the 455 itself is about to be superseded by a newer model though.
As for the scope, I would want an AO or the parallax set to 50 metres.
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