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My first question would be how accurate is the 11.25 inch change in POI? Are you shooting using a bench rest technique? How many shots in the group? How large is the group?
[John - check your math, I'm also coming up with about a 7.4% error which is similar to Jim's % error. 11.25" - 10.47" = 0.78" ; 0.78 / 10.47 = 0.074 (it's still 7% if you divide by 11.25 instead)]
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