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Cant of the weapon is probably the culprit. He is right handed and cants to the left, and you being left handed cant the opposite direction. At 25 yards, it could be 3-4 inches difference.

I am sure it is an "eye" thing. When I was a Range Master and Firearms Instructor, I noticed different shooter shoot the same weapon with different POI. eVEN SAW IT ON PISTOLS. NEVER had a...