As above but will add it is better to look down the bore from further away(like eye behind the butt pad) especially with the bigger bores.
If you have your eye in the usuall place its a very large hole and small bit of paper.(not so bad with a 22 cal ).
Should eaisly get on paper @ 25-50 adjust then out to a hundred, with practice you will be on at a hundred using this method.
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