Yep, it sounds like you need some additional height up front. I had a similar experience with my Ruger old army black powder revolver. With target loads it was right on, but with hotter field loads the rear sight wouldn't go low enough. The solution was as simple as ordering a taller sight blade from Ruger. Have you contacted Mossberg directly? They may offer a part, or fix that your local gun shop doesn't have. As a second option, since you seem to be using your Mossberg as a target toy, have you tried lower velocity loads?
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