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raising comb and p.o.i.

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checking my point of inpact yesterday, I placed 2 round dots on a large sheet of white paper 8 inches apart (why I picked 8 inches I just guessed) walked back 30 yards useing a full choke shot 5 times off handed, taking my time. inpact was always 7 to 8 inches. now if I raise my comb will it lower my inpact point and is there some what of a standard like 1/4 shim will lower it by ? thanks for any input Ed.