Back on topic here the question was is the lack of magnification going to be a factor at 200 yards. Not what caliber he was shooting and all 3 calibers will do the job.
My 2 pesos is yes it would be an issue for anybody without 20-20 vision and a lot of rounds at 200 yards with that gun. Doable, yes but I would want to move up about a hundred yards to make sure of a killing shot. 60 yards or less is a more likely shot so it shouldn't become a factor.
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