I can't remember which of the magazines I read the article in but it was about how effective the 20g is as a slug gun. As I recall the 45-70 and 20g share many similarities in energy and ballistics(when the 20g uses rifled slugs). Making it more effective than the 12g, when combined with a scope shooting decent groups at ranges past 150-200m. I wish I could find that article again it was really informative, made me want a 20g
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