Husband and I are both avid shooters with both different eye visions and we both shoot and group identical even at large distances of around 1,000 yards with the same guns.
First thing Id probably check is form, is your wife shooting off a bipod and bags or a gun cradle (Im not a fan of cradles)? If its off a bipod and bags is she pushing tension through the bipod or pulling back? Pad of the stock placed firmly into the shoulder? How is the trigger being pulled? Where are both hands being placed on the stock? Upon fire can she see the impact through the scope? Is she perhaps reaching to see through the scope where you might not be?
These are all questions Id ask first for both of you to try and correct first
Personally if Im at the range or shooting at distances, i set the gun up so the bipod is loaded and the rear pad is adjusted right where i want my point of impact to be, before my hands even touch the stock. My non trigger hand never touches the gun ever, where my trigger hand softly rests on the stock but i never wrap my thumb around the grip. As a shooter you should never try to make your body uncomfortable to make the shot work, however i get in a hunting situation that this isnt always possible. Touchpoints and pressure points matter!
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