One of my partners has a Mossberg 590A1 with the factory ghost ring sight system. With it he can hit, with no problems, out to the max. effective range of a std. 1oz. slug, which is approx. 125 yds. Beyond 125 yds. the slug peters out pretty fast. I believe he has his sighted in for point of aim/point of impact at 50 yds. as that is about the max. range in his tactical environment.
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