Making sure I'm sighting it right...

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I was pressed for time so I rushed through this, but I was sighting in a shotgun with a rear peep sight that cannot be adjusted for elevation. the front post is fixed. I used slugs to sight in, as I figured it would be more precise than shot.

At 25m, each shot produced 2 holes on paper: 1 about 4" high, and the second about 6" low. I am guessing the second hole is the wad? anyway, is it normal that the slug would hit 4" high at 25m? I shot offhand since I can't adjust elevation anyway. I typically shoot lower offhand, not higher. I figured I would never shoot prone so I might as well sight it in from offhand.

Thoughts?
 
Sighting in offhand can be problematic especially with hard kicking loads as flinch can set in after only a few shots making the exercise problematic. I would suggest you support yourself as best you can to check the zero before making any conclusions and check at 50 yards to make sure you know where the slug is hitting and not the wad. If it is shooting high you could try to find a taller post to bring the POI down.
 
Flinching and trigger weight are enough of an issue when bench shooting, but then you add breathing and a whole lot of muscle groups offhand.. I wouldn't take any conclusions off of that, try again with a proper bench setup and then you can rule out a lot more things.
 
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